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Bitcoin Discussion Thread Part 2

Hey guys I have an interesting question. I want to use HD4000 as the main gfx processor for windows navigation while using the 7970s for mining. But when I boot up this way, the hardware monitoring, voltage control, etc aren't functioning in afterburner, even when I have it set as so. Is there a way to do this?
 
rive22 said:
Hey guys I have an interesting question. I want to use HD4000 as the main gfx processor for windows navigation while using the 7970s for mining. But when I boot up this way, the hardware monitoring, voltage control, etc aren't functioning in afterburner, even when I have it set as so. Is there a way to do this?
Click to expand...

I'm mining on my main workstation and really don't see much of a difference in rates during normal use. Watching a video full screen knocks it down about 7% or so on the GPU that is driving that monitor. I guess what I'm trying to say is I think the benefits are pretty small even if you can get it working right.
 
Im going to show the green around my gills on this one but I got to ask...

With respect to the Butterfly Labs 50 Bitcoin Miner...will it not mine for Litecoins?

I mean the name is sort of a misnomer to us noobs for it being multipurpose...

Thanks
 
rehab said:
Im going to show the green around my gills on this one but I got to ask...

With respect to the Butterfly Labs 50 Bitcoin Miner...will it not mine for Litecoins?

I mean the name is sort of a misnomer to us noobs for it being multipurpose...

Thanks
Click to expand...

1) no, my understanding is that LTC are not supported

2) fuck knows if BFL will ever deliver, if they do you can bet they will be waaaaaay late and miss their power/performance envelope, buyer beware
 
rehab said:
Im going to show the green around my gills on this one but I got to ask...

With respect to the Butterfly Labs 50 Bitcoin Miner...will it not mine for Litecoins?

I mean the name is sort of a misnomer to us noobs for it being multipurpose...

Thanks
Click to expand...

No it won't, litecoins have additional requirements beyond what it takes to mine bitcoins. It is designed to make it less likely that an ASIC miner will be implemented anytime soon for Litecoin mining.
 
brycejones said:
I'm mining on my main workstation and really don't see much of a difference in rates during normal use. Watching a video full screen knocks it down about 7% or so on the GPU that is driving that monitor. I guess what I'm trying to say is I think the benefits are pretty small even if you can get it working right.
Click to expand...

Sounds good. I'm mainly looking for a way to get around the desktop lag. I'm using cgminer and whenever I put in -f 60 or the likes the program won't load.

These are the configs I'm using below and it works great for mining but watching a movie is an absolute nogo.

-I 13 -w 512 -d 0 -d 1 -d 2 -g 2 --thread-concurrency 8192 --shaders 2048 --intensity 13
 
rehab said:
Im going to show the green around my gills on this one but I got to ask...

With respect to the Butterfly Labs 50 Bitcoin Miner...will it not mine for Litecoins?

I mean the name is sort of a misnomer to us noobs for it being multipurpose...

Thanks
Click to expand...

jojo69 said:
1) no, my understanding is that LTC are not supported

2) fuck knows if BFL will ever deliver, if they do you can bet they will be waaaaaay late and miss their power/performance envelope, buyer beware
Click to expand...

brycejones said:
No it won't, litecoins have additional requirements beyond what it takes to mine bitcoins. It is designed to make it less likely that an ASIC miner will be implemented anytime soon for Litecoin mining.
Click to expand...

BFL products are ASICs which are incredibly powerful at doing one thing. BTC uses the SHA-256 algorithm for mining whereas LTC uses Scrypt. Scrypt is much more complex and requires the use of lots of vram, which is another key difference between the two. Because of this, LTC is considered ASIC resistant due to greater hardware requirements making them more expensive to develop and produce.

There are however a few different cryptos that use the SHA-256 algorithm, if you check dustcoin.com (no www.) It lists a bunch of cryptos and their respective algorithm. BFL and Avalon ASICs should work just fine with the other SHA currencies.
 
rive22 said:
Hey guys I have an interesting question. I want to use HD4000 as the main gfx processor for windows navigation while using the 7970s for mining. But when I boot up this way, the hardware monitoring, voltage control, etc aren't functioning in afterburner, even when I have it set as so. Is there a way to do this?
Click to expand...

disable ULPS
 
USMCGrunt said:
BFL products are ASICs which are incredibly powerful at doing one thing. BTC uses the SHA-256 algorithm for mining whereas LTC uses Scrypt. Scrypt is much more complex and requires the use of lots of vram, which is another key difference between the two. Because of this, LTC is considered ASIC resistant due to greater hardware requirements making them more expensive to develop and produce.

[...] .
Click to expand...

I will say this to complement what Grunt said.... scrypt needs more than just simply big amounts of ram, it needs big memory bandwidth.

In other words, the asic people would have to basically build a GPU.

Good luck with that. It aint impossible, but have fun tryin'.
 
anybody with a 7870 Tahiti LE card care to share their bitcoin/litecoin hashrates stock & overclocked, via cgminer and what flags you're using?

i'll most likely be hashing with litecoin in mind, and the 7950 needs a .64 memory:gpu clock ratio to get the best hash rates, and 7970's need a .57 ratio

i'll probably start at .57 and move upwards until I get good results but if anyone here has any hard concrete results i'd love to hear them

edit: posted this in the other bitcoin thread in the AMD subforum as well
 
Reality said:
anybody with a 7870 Tahiti LE card care to share their bitcoin/litecoin hashrates stock & overclocked, via cgminer and what flags you're using?

i'll most likely be hashing with litecoin in mind, and the 7950 needs a .64 memory:gpu clock ratio to get the best hash rates, and 7970's need a .57 ratio

i'll probably start at .57 and move upwards until I get good results but if anyone here has any hard concrete results i'd love to hear them

edit: posted this in the other bitcoin thread in the AMD subforum as well
Click to expand...

do a search for "bitcoin mining hardware comparison" there is a wiki with tons of useful info for bitcoin hashing power on all sorts of different hardware.
 
Reality said:
anybody with a 7870 Tahiti LE card care to share their bitcoin/litecoin hashrates stock & overclocked, via cgminer and what flags you're using?

i'll most likely be hashing with litecoin in mind, and the 7950 needs a .64 memory:gpu clock ratio to get the best hash rates, and 7970's need a .57 ratio

i'll probably start at .57 and move upwards until I get good results but if anyone here has any hard concrete results i'd love to hear them

edit: posted this in the other bitcoin thread in the AMD subforum as well
Click to expand...

I haven't messed with LTC, but for BTC on a Tahiti LE, I was seeing just under 500 mhash around 1150MHz
 
I'm having a bitch of a time getting cgminer running for some reason.

I have it, it starts, and says JSON 0 is Null.

Essentially in reading they say that means my worker passwords are incorrect or worker name is not correct, but I verified it, on 2 platforms for LTC and nothing.

If I can get it purring on one box, I got 4 others I'd throw cards into that run all day anyway just to get into the game for making and buying.

Anyone care to assist me thats more familiar with these things?
 
Reality said:
did you unlock afterburner in the cfg with the EULA?
Click to expand...

Yes

Just to clarify. Unlocked voltages, overclocking, monitoring, etc work fine when I boot with a video card. What I want to do is boot with HD 4000 and have that handle all the windows tasks while the video cards strictly mine. When I boot with HD 4000 the monitoring and voltage controls for the 7970s are all disabled.

Ideally I'd like to do that, but I'd settle for now on getting the priority lowered on one of the cards so doing things in windows is smooth. When I try any of the -f flags in cgminer the program won't load.
 
Got my third rig up and running today and I gotta say, the XFX 7950 Double D cards are a beautiful site. Unfortunately, the coolers are less effective then reference designs. My reference cards are running at 70c @ 72% fan speed while the Double Ds are running at 80C @ 87% fan speed. I definitely need to grab some PCIe spacers for all the cards and get them spaced out.

And now for some gratuitous nerd pron:
20130426155220.jpg


Running at 1.4MH on x3 6970 rig, 2.2MH on x4 7950 rig, and 1.6-1.7MH on x3 7950 rig.
 
best thing to do is find a way to put a radiator outside, that's what I did.
 
make your own chiller take a window ac cut the evap off and make a new one out of cooper tubing and stick that in to water and use the ac stat to keep it the temp you want
 
rive22 said:
didn't work
Click to expand...

If you have no monitors plugged into the PCIe adapters with monitor plugged into the IGP, the PCIe cards will be disabled. You need a dummy plug or plug a monitor into the cards.


For those still looking to put together a rig, I highly recommend getting voltage unlocked cards like the Sapphire 7950 Dual Fan. Mine came stock at 925/1250/1250mv, I'm able to run them at 1000/1500/1050mv (600kH/s). Reducing the voltage saves me 70W per card, so with four cards at reduced voltage the power for the fourth card is free.
 
Fooshnik said:
If you have no monitors plugged into the PCIe adapters with monitor plugged into the IGP, the PCIe cards will be disabled. You need a dummy plug or plug a monitor into the cards.


For those still looking to put together a rig, I highly recommend getting voltage unlocked cards like the Sapphire 7950 Dual Fan. Mine came stock at 925/1250/1250mv, I'm able to run them at 1000/1500/1050mv (600kH/s). Reducing the voltage saves me 70W per card, so with four cards at reduced voltage the power for the fourth card is free.
Click to expand...

Is the dummy plug needed for Linux? Both rigs in the basement are running full speed and are headless. I didnt have to do anything special, I monitor their outputs on my mining pool and if they go down I just reset the computer, guiminer is set to autostart mining when windows starts and sapphire trixx autostarts and kicks fans up to speed.
 
In case anyone needs something like this for their rigs, I just ordered 7 PCIe powered extensions from Cablesaurus.com. They accept BTC, LTC, or USD which is why I ordered from there. The site is a little fishy (limited products, half finished website), so ill let yall know if its a scam. I've found posts around the net of people ordering from him successfully but ill let ya know when/if I get them.
 
USMCGrunt said:
In case anyone needs something like this for their rigs, I just ordered 7 PCIe powered extensions from Cablesaurus.com. They accept BTC, LTC, or USD which is why I ordered from there. The site is a little fishy (limited products, half finished website), so ill let yall know if its a scam. I've found posts around the net of people ordering from him successfully but ill let ya know when/if I get them.
Click to expand...

Cablesaurus is 100% legit, ordered all my cables from him but he's been out of stock so I went with ebay on my recent order.
 
yes if your card is stable at the vcore on my rig that run hot i under clock and under v the gpus
 
hmm i have a sapphite dual fan and a gigabyte tri--the sapphire isn't showing my unlocked voltage
 
Wow, had some construction done at my house this last Thursday and today I notice one of my miners off-line. The guys had unplugged the fans and my water cooled 3x6950's where being passively cooled outside for the last 3 days!! Poor poor gpu's...

Had to add some water and do a hard reboot but (crosses fingers) it seems to be doing well still. Hell my Koolance quick disconnects where almost too hot to touch!
 
Last edited:
note235 said:
is it possible to reduce voltage when litecoin mining?
Click to expand...

On my setup, the voltages bump up to 1.25 after going past 850 on the core...I have a Sapphire and XFX 7950 running on Linux. Anyone else experiencing the same thing? :confused:
 
hard7950s.jpg


Here's our shipment. $21k in video cards. I shit you not.
Go big, or go home is our motto. 2 co-workers and I are building rigs.
I bought 18 of these bad boys and have an xfx 7950 and a powercolor 7870 Tahiti.
When I'm up and running, I expect to have 11000 kH/s at stock speeds. It will take some time to get them all tuned and oc'd. Hopefully I can get 13000 kH/s. Electricity for me is 0.068 kwh.

2 gpus in my comp, 2 in the wife's, and 16x in mining baskets is the plan. spread them around the house and open the windows.
Right now, I have 7100 kH/s with 13 gpus running@stock. basket1=3x gpus, basket2,3,4 = 2gpus each running. my comp=2, wifecomp=2
I've been having major issues getting 3x gpus running on these Biostar boards

I have some 1x to 16x adapters being delivered this week, which will help with troubleshooting and expanding to 4x gpus per basket. I have 4 laundry baskets with:
PCP&C 950w (83A @12v) (purchased for $120 each)
G1610 cpu (purchased for $44 each)
Biostar TZ77XE3 motherboards purchased for $100 each
3x msi 7950 (purchased for $300 each shipped)
3x pci-e 16x risers ($5 ea shipped approx from China). Hopefully they don't fry my boards.
8GB ram ($52)
old spare hard drive
Encore EN-UW1X45 wifi usb adapter ($10 ea)

The problem is, reaper will either crash or only run the 3rd gpu @ <10% capacity.
So right now I just have 3 gpus running on one biostar board, and a coworker the same.
If I move that hard drive with that working 3gpu hdd to another basket, it will mine 3gpus successfully. So I've isolated this being a software problem. in the reaper.conf, the device that fails or performs poorly is not consistent either. On one board, device 0 is the bad gpu, and on 2 others it's device 1.

We're using win7 currently, but will likely be switching to BAMT if we can't get this resolved.
For the person who fixes my problem in <48 hrs, 5 LTC your way. otherwise 3 LTC bounty for fixing this issue.
 
J Macker said:
hard7950s.jpg


Here's our shipment. $21k in video cards. I shit you not.
Go big, or go home is our motto. 2 co-workers and I are building rigs.
I bought 18 of these bad boys and have an xfx 7950 and a powercolor 7870 Tahiti.
When I'm up and running, I expect to have 11000 kH/s at stock speeds. It will take some time to get them all tuned and oc'd. Hopefully I can get 13000 kH/s. Electricity for me is 0.068 kwh.

2 gpus in my comp, 2 in the wife's, and 16x in mining baskets is the plan. spread them around the house and open the windows.
Right now, I have 7100 kH/s with 13 gpus running@stock. basket1=3x gpus, basket2,3,4 = 2gpus each running. my comp=2, wifecomp=2
I've been having major issues getting 3x gpus running on these Biostar boards

I have some 1x to 16x adapters being delivered this week, which will help with troubleshooting and expanding to 4x gpus per basket. I have 4 laundry baskets with:
PCP&C 950w (83A @12v) (purchased for $120 each)
G1610 cpu (purchased for $44 each)
Biostar TZ77XE3 motherboards purchased for $100 each
3x msi 7950 (purchased for $300 each shipped)
3x pci-e 16x risers ($5 ea shipped approx from China). Hopefully they don't fry my boards.
8GB ram ($52)
old spare hard drive
Encore EN-UW1X45 wifi usb adapter ($10 ea)

The problem is, reaper will either crash or only run the 3rd gpu @ <10% capacity.
So right now I just have 3 gpus running on one biostar board, and a coworker the same.
If I move that hard drive with that working 3gpu hdd to another basket, it will mine 3gpus successfully. So I've isolated this being a software problem. in the reaper.conf, the device that fails or performs poorly is not consistent either. On one board, device 0 is the bad gpu, and on 2 others it's device 1.

We're using win7 currently, but will likely be switching to BAMT if we can't get this resolved.
For the person who fixes my problem in <48 hrs, 5 LTC your way. otherwise 3 LTC bounty for fixing this issue.
Click to expand...

First off...I hate you, lol.

Second, what version of AMD drivers are you using? I had a ton of issues with BSODs trying to use different flavors of 13 drivers and x4 cards per system. After pulling my hair out for a week, I downloaded the 12.8 drivers, didn't allow windows to grab any updates and the system(s) have been flawless since. I'll take my reward now :) (though at that hashrate i'd have thought I saved you at least a days worth of LTC loss :)

Also, just pictured there,70 7950s should be getting you around 38500kh/s...each card should be doing around 550kh (LTC at least) each. Then of course, there's the power issue, how are you powering all that.? Using 950w PSUs, you'd need to build 18 rigs, each with a power potential of 950w (possibly under rating them on enough juice) which means you'd need 17,100w which is 155amps for the computers alone. It'll run if you have a 200 amp service panel but you try to turn a few more things on in your house your gonna blow your main breaker and poof, everything goes down.
 
Last edited:
If you don't mind me asking, did you get a discount when buying that much at once and if so how much per 7950 all said and done?
 
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