Mc Masta Hompus
n00b
- Joined
- Aug 2, 2012
- Messages
- 48
Hey, i was looking to add another 2 gtx 670 ftw cards to my rig, and i was wondering how much power that i needed, i have a 750w psu now, but i dont think that will cover it.
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Yeah im pretty sure that wont work either better get at least a 1KW
GTX 670s at worst use 185w per card. So you have ~600w there. The remaining system will pull another 150-200w. So were at ~850. Give yourself 10% overhead, and you end up at the 950w point.
So any solid 950w+ PSU should handle your system just dandy. Seasonic Platinum 1000w, XFX 1000w, Kingwin LZP-1000 all come to mind.
You suck at math.
185W * 3 = 555W
555W + 200W = 755W
1.10 * 755W = 830W
(10% of 755W + 755W)
How the hell did you conclude 950W?
Because, yes, I suck at math...
I rounded up on the 185 to 200, but the extra 50w is because I am infact dumb.
If he OCs that 670 it could get close to 200w is the reason for the rounding. So my math then puts him at about 880w. Seeing as there are very few quality 900w units, I'm gonna go ahead and stick to my unit reccomendations though.
Still not buying that it needs even 950W...
Here we can conclude that a max overclocked 670 consumes 325W of power, but lets round up to 330W. So lets forget system power and just multiple that 3 times. 990W at the wall.
We know the PSU used in that test setup is the Cougar GX 900W, therefore we know it has an 87% effeciency rating we can then conclude that 330W at the wall is really 288W at the wall times three is 864W. So three complete systems will consume 990W at the wall or 864W post PSU.
Still not buying that it needs 950W to power three GTX 670s.
Still not buying that it needs even 950W...
Here we can conclude that a max overclocked 670 consumes 325W of power, but lets round up to 330W. So lets forget system power and just multiple that 3 times. 990W at the wall.
We know the PSU used in that test setup is the Cougar GX 900W, therefore we know it has an 87% effeciency rating we can then conclude that 330W at the wall is really 288W at the wall times three is 864W. So three complete systems will consume 990W at the wall or 864W post PSU.
Still not buying that it needs 950W to power three GTX 670s.
Yeah, right now my psu only has enough connectors for two cards, but i think i have enough molex to power two adapters. I dont know, might as well get a hx1000 if they make those
Read his signature.
corsair tx750m psu
Those configuratons are also lean. They don't have tons of hard drives or SSD's in the mix. I think those numbers represent a best case scenario with regard to power consumption. I generally base my power supply needs on the max TDP of all hardware save for the processor which I allocate a fair amount over the mark to cover for overclocking. We know these things rarely hit their TDP's but I plan for it to happen on occasion.
So your looking at 537 watts for all of that assuming at least two drives. The numbers are certainly conservative I'd agree but it's better to have more than you need rather than less.
- 77watts for Ivy Bridge +50 for overclocking
- 30 watts for the motherboard.
- 50 watts for miscellaneous fans
- 30 watts per drive
- 20 watts for an optical if needed
- 250 or so watts per card (assuming something realy high end)
You're working with full system numbers there. Thats also not max load. I'm talking furmark and Prime95 running, or even folding. Is he likely ever to hit that kind of load? No. Thats how I recommend PSUs though. Get the Maximum theoretical load, add 10-15% and then suggest a couple of quality units that will do the job. Go look in the PSU section, I do this all the time.
90% of the time, yes, his current PSU will be sufficent. That being said, in that 10% that its not, he risks damaging his system with either high ripple or poor voltage regulation.
Alittle bit of headroom on the PSU is always healthy. It's not like I'm suggesting he get a pair of 1.6Kw PSUs. I'm suggesting he give himself some cushion. Never know when you might get the urge to start folding.
why not just sell your 670 and buy a 690? lol or pick up a 790 when they come out.
you guys must not have to pay your own power bills.
1kw is like running your microwave the whole time your gaming. haha.
< jealousy talking...thats all.
alright, thanks, i'll probably look at one of those seasonic x 1050s just for my personal satisfaction, and who knows, i might be pulling it for a new build in a few years.
Snip...........
That's not entirely true either. Just because you have a 1Kw PSU doesn't mean the system is drawing that much power every time you are gaming.
Again I did estimate high. I said as much. I wasn't sure of the precise fan power and hard drive power numbers. I had used a vague recollection of those numbers. Not sure where I got that from. Again I still stand by the addage better to have too much vs. not enough. I'm not saying you need a 1200watt PSU but 900-1,000watts for 3-Way SLI is certainly within reason.
alright, thanks, i'll probably look at one of those seasonic x 1050s just for my personal satisfaction, and who knows, i might be pulling it for a new build in a few years.
So you regularly recommend way more power than the user needs? Even at full load, with benchmarks a 2011 setup with three 670s was drawing around 650W at the wall... Guess the person who posted that was lying and/or didn't know how to full stress the system with benchmarks?
... I don't see how I'm recommending more then he needs. You say 850. I'm saying 880. There's no truly solid 900-950w units, so I'm recommending 1000w units because they perform well. You need to ease up man, you're getting really bent outta shape.
Isn't there a NZXT Hale-something 900W? I have the 850W and it is very nice. Also comes in white, which is important
... I don't see how I'm recommending more then he needs. You say 850. I'm saying 880. There's no truly solid 900-950w units, so I'm recommending 1000w units because they perform well. You need to ease up man, you're getting really bent outta shape.
First off, my 850W recommendation is you're 900-950W equivalent recommendation. You think he needs 880W, I've proven that he needs ~700W on his setup therefore 750W should handle it; however IF the OP should want to purchase a new PSU then 850W is all he would need.
Doesn't really matter since the OP is going with a 1050W anyway.
. Bent out of shape? Ha. I'm just proving my point with correct () math & real world usage; not speculations or assumptions. If I am presenting my point of view too harshly, then I apologize as it's not my intentions. Just letting the OP know that he doesn't need to spend the money.
Hey now, already admitted I made a mistake. Also, if you go back and read, I'm saying 880 including the 10% overhead. I still think you're making a mistake by saying he's ok with his 750w unit though. 90% of the time, you're right, he'd be okay. He will max it out if he were to LinX and Furmark at the same time or if he chose to start folding.
GTX 670: 186w
http://www.techpowerup.com/reviews/MSI/GTX_670_Power_Edition/26.html
His Mobo with with a 3770k (maybe 5w difference between 3570 and 3770k): 145w
http://www.techpowerup.com/reviews/Biostar/Hi-Fi_Z77X/8.html
10w for the HDD (which isn't spin up load btw, that can easily exceed 30w), 0w for SSD (not on 12v rail), and 18w for the ODD. So we have another 28w there on storage.
His case comes with 3 fans, 2x120mm and one 140mm. NZXT rates the 120mm at a touch less then 4w per. The 140 is about 7w. So we have another 15w in fans. Theres also a fan controller in the Phantom 410, which I'm sure isn't 100% efficent, so lets call that 15w 20w. Sound fair?
751w is now what I come out with when we go comepletely batty nitpicking bullshit. Now add on that touch extra for the video cards I originally said I did, and *GASP*
We're at 793w. Add in the 10% overhead. And we're at 872w.
I think you're wrong , and now I've proven my point with math AND references.
http://www.guru3d.com/articles_pages/geforce_gtx_670_2_and_3way_sli_review,4.html
Because 3 670s in Tri-SLI consumed 583W AT THE WALL, which means output from a PSU is less and this was benched on an Core i7 965 / X58 system that is more power hungry than an i5 3570k.
They even recommend 850W PSU, but only because of shitty PSUs. In reality, a solid 750W unit will power his system.
Like I said before.