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Will a maxed out PSU slow my graphics cards down. Help!

post #1 of 12
Thread Starter 
I'm pretty new to overclock.net so if I'm re-posting please forgive me.

I'm having an issue after adding a second 6870x2 to my pc. After going through the install process and setting up the card everything seemed fine until I decided to run 3dmark11 my score dropped by 1000pts. After that tried some games they ran without crashing but were incredibly slow even with all 4 gpu's only under 50ish% load and the cpu only about 40%.

I tried everything re-installing drivers & application profile etc and tried all sorts of custom settings nothing would allow me to push my gpu's past 50-60%. I was beginning to wonder if my 1000watt Antec truepower Quattro is not up to the task of providing power for the cards. So I supplemented it whit a 5.25" power supply 300watt in my cd drive bay because I had it lying around (FSP BoosterX 3 ). I used one of its connectors on each of the 6870x2's plus a connector from my Antec PSU. made no real difference.

I know these are really power hungry cards. around 490watts each. So I think i might be over my limit for power consumption. especialy seeing as this psu can only provide 25-30A per 12v rail (Multi 12v Rail PSU). But if I was over my power limit wouldn't the PC be unstable and crash? Just not sure if I should fork out the money for a new power supply. Or is the problem elsewhere?

Will not getting enough power kill my GPU's performance?


Tweaktown have power consumption figures for the 6870x2.
http://www.tweaktown.com/reviews/4212/powercolor_radeon_hd_6870x2_2gb_overclocked_video_card_review/index17.html



System Spec

AMD FX-8350
Asus M5A99FX PRO R2.0
16gb 1866mhz G.Skill Ram
2 X 6870X2 in CF. (double gpu cards)
2 x 1tb hard drive
80gb OCZ revodrive SSD.
1000watt Antec Truepower Quattro.
FSP 300watt Booster X3

Please note I am not an ATI/AMD fanboy. However I don't want people telling me just to go sell my cards and buy Nvidia etc or even a newer Ati card. I mostly chose the 6870x2 because i though it would be an interesting build. Now i just want to get them working.

Thanks in advance. biggrin.gif
post #2 of 12
You have way more than enough power. Is everything at stock clocks?

The 490W is wattage before efficiency is calculated.


EDIT: Also keep in mind on that benchmark they are using an i7-980X clocked at 4.2GHz.. that is eating most of the power.

A single 6870 has a TDP of ~160W. Assuming the cards scale linearly then 4 of them would be equal to 640W. Plus your chip and other devices and you don't even come close to maxing your PSU.
Edited by iinversion - 11/15/12 at 4:08pm
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post #3 of 12
You attempting to use a chip in quad-fire that was not designed for anything more than crossfire is probably the reason why your performance is poor. 6870s are meant for crossfire only, not tri-fire or quad-fire.
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post #4 of 12
Thread Starter 
Yeah I realise that the chip is not designed to support quadfire, the cards themselves though are completely different to a reference 6870.
I wanted to try anyway its seems to work (sort of) under curtain circumstances. I run an eyefininty setup with 3 1920X1080 monitors. This tends to amplify the issues im having. At lower resolutions like 1920X1080 everything works 3dmark scores are still low but gaming is good at around 65fps with a little bit of stutter. Maybe I'm maxing the 1gb of Vram each gpu has running at such high resolution.

I'll keep fiddling with it. I'm also struggling with the the dreaded micro-stutter caused by multiple gpus. I'm also experiencing the problems that come with eyefinity and crossfire so I'm glad that we could eliminate the power supply as a potential issue.

One step at a time. I tend to be the kind of person who wastes a lot of money trying new things in my pc and never quite getting them to work how I dream it would.

Thanks.rolleyes.gif
post #5 of 12
power supply is more than enough .

sounds to me like a cpu bottleneck. if its true if your cpu doesn't support quadfire..than it might be hindering its max performance. you should of known this before even buying another one.

best bet is... if the performance for 3 monitors is fine, then don't worry about it. if not then switch to intel for quadfire.
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post #6 of 12
Thread Starter 
Hmm Interesting.

I would think the AMD fx-8350 would support quadfire. It is AMD's flagship model & AMD owns ATI. However I never bothered to check. I know the specs of my board support quadfire and it has the AM3+ socket for this chip. It may be a cpu bottleneck which is a shame AMD have let the processors slip a little since the 9**BE and the 1100T.

Im gonna press on with it and see if i can find a solution.
post #7 of 12
What is the clock speed of your CPU?
     
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post #8 of 12
There is no such thing as CPU "support" for CFX, only the motherboard needs to be able to do it. Now, that doesn't mean a slow CPU will be able to feed quad GPU's, just that it has nothing in particular to do with the CPU itself having support for the technology.

That being said, you have four mid-low end GPU's in CFX that were not meant to be that way. Quad card support is absolutely atrocious in the first place even on flagship cards (doubly so when you add in eyefinity), more than likely you are experiencing driver issues more than any kind of PSU problem. I would get rid of that 300w aux supply as well, that is just waiting for your rig to catch fire. There is a reason those never caught on. Your 1000w has plenty of power for that rig, I would guess you might see ~800w at the wall at full load.
post #9 of 12
Quote:
Originally Posted by Tsumi View Post

You attempting to use a chip in quad-fire that was not designed for anything more than crossfire is probably the reason why your performance is poor. 6870s are meant for crossfire only, not tri-fire or quad-fire.
That's not true. You can't hook up 2 6870s but you can hook up 2 6870'sx2 (Dual GPU).
Like this one: http://www.techpowerup.com/reviews/Powercolor/HD_6870_X2/
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post #10 of 12
Quote:
Originally Posted by XxYouGotOwnedZz View Post

That's not true. You can't hook up 2 6870s but you can hook up 2 6870'sx2 (Dual GPU).
Like this one: http://www.techpowerup.com/reviews/Powercolor/HD_6870_X2/

You can most certainly hook up two 6870's, I ran CF 6870's and 6850's for a time. They only have one CF finger though so you can't do 3 or 4 way.
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