GPU Shutting Down My PC? (I've checked a lot of things)

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Aiden2095

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Feb 9, 2014
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Hey, I recently fitted a new PSU (750W - http://www.ebay.co.uk/itm/261226625844?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649http://www.ebay.co.uk/itm/261226625844?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649 that's the model) and a Geforce GTX 570 GPU in my computer. My CPU is an AMD FX 4100 Quad Core Processor (3.6Ghz) not overclocked.

I'm having problems with the GPU I suspect, my computer runs fine when i'm just using it for Skype or web browsing, however when I play games (currently tested League of Legends and Skyrim) the computer will shutdown after anywhere between 5 and 25 minutes, there is no blue screen (I have installed a programme test for blue screens that might have passed too quickly, but nothing is showing) I also thought it might have been the computer overheating (with my GPU going to around 45-50 degrees, and my CPU at 70-80 while gaming) so I installed a new CPU cooler to stop this, and the temperature of the two dropped (with the CPU dropping to around 25 and the GPU around 40.)

Thinking i'd fixed the problem, I tried to game again and the same problem continued happening. I reinstalled all of my GPU drivers, and ran a programme to remove any previous AMD/ATI drivers that may have remained in my computer (I changed from AMD to Nvidia) again, this didn't fix the problem.

So i'm led to believe the problem lies in the PSU or the card itself, as you can see the PSU is 750W, more than enough for the components in my pc - though my friend mentioned the problem might not lie with a lack of wattage, rather some other technical things. Another friend mentioned the GPU being fitted incorrectly, but after taking the pc apart and putting it back together again, the problem wasn't solved.

I just wondered if anyone has some useful advice or ways to fix this problem since i'm completely out of ideas, I will probably ring my local PC specialist tomorrow if there is nothing I can do, but i'm trying to avoid that since it takes so long, and may have a hefty price.

Thank you to anyone to replies. :)
 
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jznightmare

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Nov 6, 2013
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its the first time ive heard of such a brand. is it 80+ certified?

i suggest you try another PSU. it might not be delivering enough juice to your VC

years ago i experienced something very similar, it turned out that the PSU wasnt supplying enough power to the entire system. it later died.
 
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BlacKHawK3

BlacKHawK3

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Oct 4, 2011
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Take out the GPU and stress-test the computer (use Prime95 or multiple instances of memtest). If it runs fine, put the GPU in and try to duplicate the problem with a stress test (use FurMark or similar), not in games. Get GPU-z ( http://www.techpowerup.com/gpuz/ ) or a similar monitoring tool and check the +12V voltage at the GPU while under load. It should be over 11.6V while running FurMark.
 
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Neuroces

Neuroces

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Mar 21, 2013
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Assuming the issue is the PSU.
Those GPU's are pretty beastly on the power front 219W if i'm not mistaken? What is your budget on the PSU?

If you don't have as much to spend, try taking the Wattage down a notch if you have no plans for any beastly future upgrades. I bought a Corsair that's survived upgrades in 2 in PC's each running a pretty crazy setup.
Even when I blew a connecting wire to my GPU, and my room went up in smoke.
The PSU did a great job of saving itself and my GPU's :p Never skimp on the PSU is a rule imo.
 
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Aiden2095

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Feb 9, 2014
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I'm not sure what Wattage I needed for the PC to actually get enough power, which is why I went for 750. If you could tell me what I should go for that'd be useful.

I don't want to spend a great deal, preferably around 50GBP, if that's an option.
 
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BlacKHawK3

BlacKHawK3

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I have run 3 overclocked 7970s (~300W each) on a single high-end 850 watt PSU, though I wouldn't recommend it :)

A good 600 watt PSU will be more than enough to run a single GTX 570, even if you upgrade the CPU to something more power-hungry later. If your budget is tight, I have had good experiences with this one:

http://www.newegg.com/Product/Product.aspx?Item=17-153-166

That will power a 570 and an 8-core FX easily.
 
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Neuroces

Neuroces

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Mar 21, 2013
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Blackhawk that is a crazy setup! haha.

Yeah also agree with the 600w. Should be more than enough. There is also newer, better and less power hungry cards out there than the 570. Not that it's a bad card by any means of course :)
So if you upgrade the GPU you can always match to the power of the PSU.

I originally had this PSU in my very first build:
http://www.overclockers.co.uk/showproduct.php?prodid=CA-048-CS&tool=3

I always buy from OCUK cause of the service and delivery have been excellent from them. But they are usually a bit more expensive. You can always search around Google for that PSU see if it takes your fancy. I know just buy doing a quick search I found it here for under £50:
http://www.tinkles.net/index.php?main_page=product_info&products_id=7162

But can't credit on the site for delivery and reliability so I would do some head hunting first ;)

 
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Neuroces

Neuroces

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Mar 21, 2013
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You can always do a bit of googling on Amps and Watts before making your final choice. But I see no reason why the amps provided by the Card and either of the two PSU's mentioned would effect the functionality of the card.
Unless someone else wants to challange that :)
 
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BlacKHawK3

BlacKHawK3

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P = i*V, or Watts (power) are equal to Amps (current) times Volts (voltage). A stock GTX 570 can draw 219 watts at 12 volts, which means it needs 219/12 = 18.3 amps on the +12V line. Power supplies output several voltages, but GPUs only draw from the +12V line. Cheap PSUs are often rated by the combined maximum of all the voltage rails, so your 750W PSU might only put out 350W of usable power on the 12V rail.

I guarantee that the advertised 32A on each 4 separate +12V rails is NOT true, so you should be able to get your money back if you bought it off eBay.

The +12V amperage rating needs to be high enough for the GPU, but it also needs to be stable under load. As the GPU tries to draw more power, it can cause the voltage to "droop", meaning the supply can't hold +12 volts at that amperage output. GPUs are often sensitive to this voltage droop, and can't function if the +12V supply line drops below about 11.5V. You can watch this droop if you get a voltage monitoring program (GPU-z can do it) and hit the GPU with a heavy load (use FurMark or similar). That's one way to know you need a better PSU.
 
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