Achieva Shimian QH270| $400 IPS 2560x1440 Korean Monitor

My 2B Catleap definitely does not have overdrive. Maybe the others are different. They don't all have the same hardware. The newer Catleaps have a different timing controller, probably the same one as the Crossover.

There are at least two different timing controllers being used. The 2B Catleaps have a timing controller with an LG chip, while the others have a Parade chip. Maybe the Parade controller has overdrive and the LG one doesn't. Someone with both versions found the newer one has a blue tint. He swapped the controller boards and found the blue tint is coming from the controller, not the panel.
 
Got 3 later this week, upon very quick inspection (white background to check for dead pixels, black background to check for stuck pixels), it SEEMS like all three of my panels are pixel perfect, other then the slight yellow tint on the corners of the screen that everyone has.

pDFUel.jpg


acwZ8l.jpg
 
ToastyX said:
My 2B Catleap definitely does not have overdrive. Maybe the others are different. They don't all have the same hardware. The newer Catleaps have a different timing controller, probably the same one as the Crossover.

There are at least two different timing controllers being used. The 2B Catleaps have a timing controller with an LG chip, while the others have a Parade chip. Maybe the Parade controller has overdrive and the LG one doesn't. Someone with both versions found the newer one has a blue tint. He swapped the controller boards and found the blue tint is coming from the controller, not the panel.
Click to expand...
Going by the chart that NCX linked, there is some difference between models, Catleap, Crossover, Shimian. The Crossover does seem to edge the other models out with better response times. Wish i had taken that in consideration when selecting since i ended up with a 2C Catleap :p.

Hard for me to to complain though since mine is almost perfect. Only one stuck green pixel right up against the bezel, almost no feint shadow at the bottom on a white screen, and i was able to reverse the backlight bleed in the lower right corner with some flexing.
 
Congrats on your 3 Korean 1440P monitors. Nice setup! Your desk sure is long to accompany the 3 screens.
 
so i've been a lurker on this thread for a long, long while now, and I am finally about to pull the trigger, but I have just two questions. Now that people have been buying for a while, based on what we now know:

1. among the Shimian, Catleap, PCBank, and Crossover, which is most likely to be pixel perfect, and

2. is there a particular seller that seems to be selling more pixel perfect displays?

I know that I shouldn't expect, nor dare hope, for a pixel perfect display, but why not try the best I can?

Thanks!
 
Well we don't know which 2x catleap playerwares reviewed, but the one they reviewed was just as fast as the rest, except for the PCBANK which holds the crown

I don't see how they rest can't be over driven, other wise they would be slow like the LG IPS231P/236V models which have 2x the measured response times according to playerwares.

limsunjung says he is selling the newly revised Crossover's so I've asked him how he knows they are revised.
 
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@MontyAC I saw that, and it looks tempting, but, based on what I've read, the claim of pixel perfection is meaningless. I'd rather go based on what people have been receiving, not what the sellers are claiming to sell.
 
It is written on the box by the manufacturer. My monitor's box says Pixel Perfect on it and it is pixel perfect when I tested it.
 
MontyAC said:
It is written on the box by the manufacturer. My monitor's box says Pixel Perfect on it and it is pixel perfect when I tested it.
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I think I might just go with what you did and get the PCBank.

Does it have a VESA mount? If so, is it 100mm or otherwise?
 
After owning 6 previous lcds, 2 were ips Dell's, I can say the PCBANK is the best one thus far. The text is so sharp at 1440p and the colors are gorgeous. The screen is glossy. I get some reflections but my room is fairly dark with no direct sunlight.
 
What were your two Dells?

If one of your current Dells is my current Dell, I'm going to call it fate and buy the non-super PCBANK (even though I absolutely hate the curve on the bottom, i.e. the bezel).
 
These were old Dells, and they had the matted screens. The PCBANK bezel is fairly plain looking with high gloss black.
 
CEpeep said:
Get a different one, then. They're all the same panel.
Click to expand...

But I'm hearing, especially from Monty, that my cheapest way of securing the best chance of getting a pixel-perfect display is that pixel-perfect PCBanks. Even though I hate the bezel, I'd hate a dead pixel more.

What do you think?
 
Just won a crossover 2720MDP from ebay for 411$.

The seller assured me it was the revised version. I can actually verify this since I have a colorimeter so it will be fun to see how this turns out and to deal with the potential hassle.
 
10ms+ is not that low of a response time for blurred pixel transitions. My cinema display is similarly 10ms or so, but 60hz and it smears badly. I doubt you will get smear reduction on these compared to a 60hz 2ms or so tn, let alone a 120hz ~2ms tn with high/very high response time compensation (which still blurs/smears, just appreciably less). These are still a gorgeous screen if anything like the ACD.. I just doubt the hz is going to do anything vs 10ms+ ips smearing and who knows what kind of overdrive. In my opinion, $400 or less for the other great qualities of this type of screen is an insane deal even if they end up without anything like ~2ms 120hz TN gaming monitor with high/very high RTC's gains vs smear. If I didnt already have an acd I'd be all over one of these.
 
bagelrain said:
But I'm hearing, especially from Monty, that my cheapest way of securing the best chance of getting a pixel-perfect display is that pixel-perfect PCBanks. Even though I hate the bezel, I'd hate a dead pixel more.

What do you think?
Click to expand...

I have the Shimian and it's "pixel perfect." (No dead/stuck pixels or any blemishes at all.) I paid $301.50 with coupon for it at the end of March. These are all A- panels, and you have a good shot of getting a display free of dead/stuck pixels regardless of which one you go with. At any rate, the idea of getting bent out of shape that one or two of the 3,686,400 pixels on your display isn't up to snuff is kind of silly. You should go with a seller that has good track record, and a model that has the case/bezel that you find aesthetically pleasing. You should prepare for your display to have a dead/stuck pixel or two and be pleasantly surprised if it arrives 100% perfect. If that's something that you can't deal with, these aren't the monitors for you.

No seller completely guarantees no dead/stuck pixels. According to others experiences in this thread, the best you can get is a ~$100 refund for a problem display, which puts the "pixel perfect" vendors at price parity with the non-perfect ones if you get a lemon.
 
NCX said:
Just won a crossover 2720MDP from ebay for 411$.

The seller assured me it was the revised version. I can actually verify this since I have a colorimeter so it will be fun to see how this turns out and to deal with the potential hassle.
Click to expand...


who the seller on ebay any link?
2720MDP $411 is very cheap
many sellers on ebay sell for about $500 more for 2720MDP

The most expensive korean monitors 27" brand on ebay $1.111
http://www.ebay.com/itm/New-DAVI-D2...4537?pt=Computer_Monitors&hash=item27c57f8a29
 
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NCX won the auction, I was also watching it because I noticed the seller updated the picture of the monitor to say they're the newly revised version, but I totally forgot about the auction and went to sleep (it ended 3am UK time). But I'm sure it's in much better hands with NCX!
 
Btw, I've noticed that the price for the Shimians keep dropping. Are they also dropping in Korea? If not what's the rough price of these in Korea atm without the shipping)

I'm thinking about getting one of these but I've got really important uni exams now that my career depends on so I'm not sure whether to buy the monitor now (so that I stop checking these threads and save my time but risk ending up spending more time with the monitor if there are problems) or to wait and see if the price will drop more. I'm a student so every little helps.
 
Ulti said:
Btw, I've noticed that the price for the Shimians keep dropping. Are they also dropping in Korea? If not what's the rough price of these in Korea atm without the shipping)

I'm thinking about getting one of these but I've got really important uni exams now that my career depends on so I'm not sure whether to buy the monitor now (so that I stop checking these threads and save my time but risk ending up spending more time with the monitor if there are problems) or to wait and see if the price will drop more. I'm a student so every little helps.
Click to expand...

I don't think you'll see the price drop much further. They've dropped to $225-230 in Korea down from $250, not a huge drop, so I'm guessing the sellers are either getting them for a bit less or figured out a way to ship them for less.
 
I am just after reading a very interesting post over on overclockers.co.uk. One of the guys called Moogley is the person to credit this with. But he approached the 100hz from a different angle and its something we all should have considered because this is a technical forum after all.

Anyway, these monitors are connected to the computer using dual-dvi. The maximum bandwidth of dual dvi is 9.9Gbit(330MHz) 1920x1080@120hz just falls inside this bandwith at 8.8Gbit.

These korean monitors have a resolution of 2560x1440. The max refresh rate that is supported by dual link dvi at this resolution is 75hz. Since you can't transmit a signal more than the cable is able to support, does that mean

1. that the 2B PCB isnt transmitting true 100hz or 120hz or 85hz, but some kind of interpoled signal?

or

2. That the graphics card will limit the frequency automatically and you really are only getting 75hz or whatever it decides is the highest it can transmit.

If point 1 is what is happening that this would lead to input lag and actually be worse for gaming than the 60hz catleap.

If point 2 is true then all this talk of Nvidia or AMD card been better is rubbish becuase the highest refresh rate supported at that resolution through dual link dvi is 75hz.

As I said, some very interesting reading. Personally I don't really know enough about dvi cables or monitors to be argue for or against this, but the figures seem to add up.

EDIT:- I should add that maybe this has been discussed already. If it has, I really would like an explaination. :)
 
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steal said:
I don't think you'll see the price drop much further. They've dropped to $225-230 in Korea down from $250, not a huge drop, so I'm guessing the sellers are either getting them for a bit less or figured out a way to ship them for less.
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Well it's still a 10% drop, $30 USD is still a saving, especially when you're a student like me.

I guess they're so cheap at the moment because the only monitors that were using these panels were probably the ACD 27", Dell U2711 and the HP RZ2740W. This meant that a lot of A- panels would have simply been dumped as they weren't good enough for those 3 monitors. However, they've now found a use for it, hence why they're willing to sell them so cheaply. Add in the lowish costs of manufacture, design and other costs (such as the premiums the resellers charge + eBay/paypal fees etc) and you get a rough price of ~$150 I'm guessing. I guess the lowest they'll be willing to charge is probably $200 which means at least $275 with delivery (I remember someone saying they pay $100 for delivery too - if that's true then I guess the monitors will never go below $300).

Well either way, I think in the long run, the stock of A- panels will gradually get depleted, so I think the long term price will probably be $300 for the lowest end models which is pretty much what they're charging now.
 
reaper12 said:
I am just after reading a very interesting post over on overclockers.co.uk. One of the guys called Moogley is the person to credit this with. But he approached the 100hz from a different angle and its something we all should have considered because this is a technical forum after all.

Anyway, these monitors are connected to the computer using dual-dvi. The maximum bandwidth of dual dvi is 9.9Gbit(330MHz) 1920x1080@120hz just falls inside this bandwith at 8.8Gbit.

These korean monitors have a resolution of 2560x1440. The max refresh rate that is supported by dual link dvi at this resolution is 75hz. Since you can't transmit a signal more than the cable is able to support, does that mean
Click to expand...

Actually for Dual Link DVI :

Bitrate (Single link) 3.96 Gbit/s
(Dual link) Limited only by copper bandwidth limitations, DVI source limitations, and DVI sync limitations.
Click to expand...

So theoretically that doesn't appear to be true and newer GTX 680 cards can go beyond 120hz in SLI. Display Port 1.2 currently supports 17.28 Gbit/s and beyond in bandwidth as well . Bandwidth isn't really the issue. The issue is if the panel has the right chipset (2B) and a strong enough video card setup.

reaper12 said:
1. that the 2B PCB isnt transmitting true 100hz or 120hz or 85hz, but some kind of interpoled signal?
Click to expand...

No , when its transmitting 100hz or more its actually transmitting that rate. The panel however can't move its pixels as fast as a 120hz TN panel for instance so blurring will still occur but it will be reduced (obviously) from 60hz.

reaper12 said:
or

2. That the graphics card will limit the frequency automatically and you really are only getting 75hz or whatever it decides is the highest it can transmit.
Click to expand...

Again , the graphics card does limit the possible refresh rate (at least the newest ones do not) and only the newest cards can handle high refresh rates currently. Its a lot of pixels to push around so its not exactly something a cheap card will be able to handle with enhanced refresh rates.

reaper12 said:
If point 1 is what is happening that this would lead to input lag and actually be worse for gaming than the 60hz catleap.

If point 2 is true then all this talk of Nvidia or AMD card been better is rubbish becuase the highest refresh rate supported at that resolution through dual link dvi is 75hz.

As I said, some very interesting reading. Personally I don't really know enough about dvi cables or monitors to be argue for or against this, but the figures seem to add up.

EDIT:- I should add that maybe this has been discussed already. If it has, I really would like an explaination. :)
Click to expand...

This has been discussed , you should have read 120hz.net or just searched through this thread. There was a limited run of these monitors that were able to hit beyond 100hz and they sold out quickly , they weren't some kind of weird fluke they were just overclockable. Now folks are trying to secure more 2B boards and offer those overclockable monitors again for an increased cost , however you are not guaranteed to hit 100hz+ so its a gamble. When these monitors actually hit those refresh rates its not because of some technical trick that mimics those numbers , these monitors or the ones capable of this are refreshing at that rate. Its why they are so desired and while running at 120hz on an IPS panel won't provide the same smooth experience as 120hz on a TN panel with much faster pixels , its really one step closer to CRT like gaming without having the sacrifices of using a TN panel. Although some TN panels are superior to IPS panels so its a toss up there as well.
 
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reaper12 said:
I am just after reading a very interesting post over on overclockers.co.uk. One of the guys called Moogley is the person to credit this with. But he approached the 100hz from a different angle and its something we all should have considered because this is a technical forum after all.

Anyway, these monitors are connected to the computer using dual-dvi. The maximum bandwidth of dual dvi is 9.9Gbit(330MHz) 1920x1080@120hz just falls inside this bandwith at 8.8Gbit.

These korean monitors have a resolution of 2560x1440. The max refresh rate that is supported by dual link dvi at this resolution is 75hz. Since you can't transmit a signal more than the cable is able to support, does that mean

1. that the 2B PCB isnt transmitting true 100hz or 120hz or 85hz, but some kind of interpoled signal?
or
2. That the graphics card will limit the frequency automatically and you really are only getting 75hz or whatever it decides is the highest it can transmit.

If point 1 is what is happening that this would lead to input lag and actually be worse for gaming than the 60hz catleap.

If point 2 is true then all this talk of Nvidia or AMD card been better is rubbish becuase the highest refresh rate supported at that resolution through dual link dvi is 75hz.

As I said, some very interesting reading. Personally I don't really know enough about dvi cables or monitors to be argue for or against this, but the figures seem to add up.

EDIT:- I should add that maybe this has been discussed already. If it has, I really would like an explaination. :)
Click to expand...

No, the DVI dual link spec of 330 MHz is just it's designed limit. Doesn't mean it's a hard limit. You are basically overclocking the signal over the cable. The monitor is running at those true Hz. As long as the RAMDAC can output he signal and the cable can transmit the signal without degradation, the Catleap will process it until it hit's it's max.

A lot of times rated specs are garbage. Remember DVI is quite old. A DP 1.2 cable is generally thinner and has less contacts yet is rated to run quite a bit faster in data transmission. But then again DP is packet based like Ethernet versus continuous signal like DVI/HDMI.
 
I've been reading through this thread since it started (and several at OCN), but I can't seem to figure out which video card would be the minimum required to drive this bad boy (I just do office work, basicaly--no gaming).

I've got the following cards now, but I'm sure they are inadequate:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102103
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102877

Any advice for a good AMD card that I could use to drive one of these and a secondary 1920x1080?

Thanks!
 
darknite39 said:
I've been reading through this thread since it started (and several at OCN), but I can't seem to figure out which video card would be the minimum required to drive this bad boy (I just do office work, basicaly--no gaming).

I've got the following cards now, but I'm sure they are inadequate:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102103
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102877

Any advice for a good AMD card that I could use to drive one of these and a secondary 1920x1080?

Thanks!
Click to expand...

I use an HD5570 and it does just fine. 6570 is reasonably priced and should work fine as well.
 
If your cards' specs show that they can run 2560x1440 then for non gaming you should be ok.
 
Godmachine said:
Actually for Dual Link DVI :

Quote:
Bitrate (Single link) 3.96 Gbit/s
(Dual link) Limited only by copper bandwidth limitations, DVI source limitations, and DVI sync limitations.
So theoretically that doesn't appear to be true and newer GTX 680 cards can go beyond 120hz in SLI. Display Port 1.2 currently supports 17.28 Gbit/s and beyond in bandwidth as well . Bandwidth isn't really the issue. The issue is if the panel has the right chipset (2B) and a strong enough video card setup.
Click to expand...

As I said I don't know much about this. You quoted one source where it says that dual link dvi is basically unlimited and depends on the devices attached to it. But, other wiki's say the max bandwidth is 9.9Gbits. Who is right?

I can't get over why there would be a limit on a single link cable but no limit on a dual link cable. You are just doubling the number of pins. It can't be unlimited and it can't be much beyond the limits of the double the capacity of a two single link DVI cables. Or can it?
 
Vega said:
No, the DVI dual link spec of 330 MHz is just it's designed limit. Doesn't mean it's a hard limit. You are basically overclocking the signal over the cable. The monitor is running at those true Hz. As long as the RAMDAC can output he signal and the cable can transmit the signal without degradation, the Catleap will process it until it hit's it's max.

A lot of times rated specs are garbage. Remember DVI is quite old. A DP 1.2 cable is generally thinner and has less contacts yet is rated to run quite a bit faster in data transmission. But then again DP is packet based like Ethernet versus continuous signal like DVI/HDMI.
Click to expand...

Yes, the DVI cable spec is quite old. So that means it should be well known what it's limitations are. And DP v1.2 should be well capable of handling these high resolutions and refresh rates at it has a bandwidth of over 21Gbits.

As I said in my last post I just can't get my head around why single link won't work when it reaches it's bandwidth limits but a dual link will.
 
reaper12 said:
As I said I don't know much about this. You quoted one source where it says that dual link dvi is basically unlimited and depends on the devices attached to it. But, other wiki's say the max bandwidth is 9.9Gbits. Who is right?

I can't get over why there would be a limit on a single link cable but no limit on a dual link cable. You are just doubling the number of pins. It can't be unlimited and it can't be much beyond the limits of the double the capacity of a two single link DVI cables. Or can it?
Click to expand...

Well the spec is what its been officially "deemed" to be. The actual physical transfer limitations depends on a number of different factors (as the quote illustrated) so I don't actually think that 9.9Gbits is the actual transfer limitation of the cable , I think it has more to do with how fast the interface is attached to it on both ends. Copper's limitation is constantly being pushed. However there will be an actual physical limitation we've just yet to hit that wall.

All of these "specs" are best guess really.
 
Godmachine said:
Well the spec is what its been officially "deemed" to be. The actual physical transfer limitations depends on a number of different factors (as the quote illustrated) so I don't actually think that 9.9Gbits is the actual transfer limitation of the cable , I think it has more to do with how fast the interface is attached to it on both ends. Copper's limitation is constantly being pushed. However there will be an actual physical limitation we've just yet to hit that wall.

All of these "specs" are best guess really.
Click to expand...

Well thanks for taking the time to try and explain :) It still puzzles me, that if there is a wall a single link cable won't go beyond, why isn't dual link cable limited to double that, or even triple that!! :D Heck if you are getting 120hz on one of these monitors then it's five times the bandwidth of a single link cable!!
 
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