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How many watts do I need?

post #1 of 12
Thread Starter 
I have recently upgrade to 6990 and after a few days the GPU will randomly shut down when I was in the middle of playing a game or sometimes even at game loading screen. I have reinstalled windows 7 and the random black out still occurs, so it seems like the PSU is on its way out... (had the rig for ~2 years but my computer runs 24/7).

Question is, if I go for a new PSU, do I need 1000w just to be on the safe side, or a good 850w will do?

Thanks.
skcorpio
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skcorpio
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post #2 of 12
Quote:
Originally Posted by skcorpio View Post

I have recently upgrade to 6990 and after a few days the GPU will randomly shut down when I was in the middle of playing a game or sometimes even at game loading screen. I have reinstalled windows 7 and the random black out still occurs, so it seems like the PSU is on its way out... (had the rig for ~2 years but my computer runs 24/7).
Question is, if I go for a new PSU, do I need 1000w just to be on the safe side, or a good 850w will do?
Thanks.

smile.gif
A solid 650W PSU will do.. but you don't need a new PSU, what you're describing is not a PSU issue... maybe a driver issue or maybe a temperature issue..
In what game/s do you get the shutdowns/blackouts!?.. have you run any benchmarks to try and replicate the behavior under precise conditions?
post #3 of 12
Thread Starter 
Shouldn't be driver issue. I was able to replicate the blackouts under a fresh windows 7 and i tried a few drivers as well.

Temperature was <70C.

Game was starcraft 2 (not supposed to be graphic intensive i know...)

The rig seems to be running fine now but I pulled out all my other PCI cards (wireless and sound card).

Why do you think it's not a PSU issue?
skcorpio
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skcorpio
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Intel X25M 80GB Samsung F3 Spinpoint 500GB Thermalright Silver Arrow Windows 7 Professional 64bit 
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post #4 of 12
scientifically, your psu have more than enough juice to power your system.

have you tried using other cables or putting it on different slot?

also on some motherboards, you need to plug a molex power to power your pcie slots
Prototype X001
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Prototype X001
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post #5 of 12
Quote:
Originally Posted by skcorpio View Post

Shouldn't be driver issue. I was able to replicate the blackouts under a fresh windows 7 and i tried a few drivers as well.
Temperature was <70C.
Game was starcraft 2 (not supposed to be graphic intensive i know...)
The rig seems to be running fine now but I pulled out all my other PCI cards (wireless and sound card).
Why do you think it's not a PSU issue?

Perhaps an unstable cpu overclock?


Did you make sure to plug in the power connectors for the card? The pci-e slot can only put out 75 watts of power to a card.
Edited by Fatalrip - 12/23/11 at 4:33pm
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post #6 of 12
Quote:
Originally Posted by skcorpio View Post

Shouldn't be driver issue. I was able to replicate the blackouts under a fresh windows 7 and i tried a few drivers as well.
Temperature was <70C.
Game was starcraft 2 (not supposed to be graphic intensive i know...)
The rig seems to be running fine now but I pulled out all my other PCI cards (wireless and sound card).
Why do you think it's not a PSU issue?

sounds like the motherboard cannot supply enough power on your pcie slots if more device is present

try to look if there are any molex plug or update your mobo bios
Prototype X001
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Prototype X001
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post #7 of 12
Thread Starter 
i understand 850w should be enough, but doesnt the capacitor decay over time? especially i run this thing 24/7 for 2+ years.

nothing is overclock after i reinstalled win7

oh yea, i forgot to mention too i switched the pcie power cable to my 6990 / pulled wireless and sound card in my last attempt of rescue, then the rig seems to be fine now.

if the psu has PCIe power cables then shouldn't i use those instead of the molex ones?

i will try to do a mobo bios update and replug everything to see if it works. do i need to reinstall windows after the bios update?
skcorpio
(16 items)
 
  
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Intel Core i7-930 @3.8GHz ASUS P6X58D Premium MSI Radeon 6990 Corsair Dominator 3 x 2 GB 
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Intel X25M 80GB Samsung F3 Spinpoint 500GB Thermalright Silver Arrow Windows 7 Professional 64bit 
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skcorpio
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Intel Core i7-930 @3.8GHz ASUS P6X58D Premium MSI Radeon 6990 Corsair Dominator 3 x 2 GB 
Hard DriveHard DriveCoolingOS
Intel X25M 80GB Samsung F3 Spinpoint 500GB Thermalright Silver Arrow Windows 7 Professional 64bit 
MonitorKeyboardPowerCase
Samsung P2350-1 x2 Filco Brown Corsair 850TX Cooler Master HAF 922M 
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post #8 of 12
Quote:
Originally Posted by skcorpio View Post

Shouldn't be driver issue. I was able to replicate the blackouts under a fresh windows 7 and i tried a few drivers as well.
Temperature was <70C.
Game was starcraft 2 (not supposed to be graphic intensive i know...)
The rig seems to be running fine now but I pulled out all my other PCI cards (wireless and sound card).
Why do you think it's not a PSU issue?

Because there's nothing pointing towards such a conclusion.. your PSU can output a lot more power than your hardware is pulling under any gaming load.. it's probably an unstable overclock, CPU or GPU.. either way, I doubt it's your PSU.

Run Prime95 Large FFT and Furmark, run them individually for 5 minutes each and if you don't get any shutdown run them simultaneously for another 5 minutes and come back here with the results.
post #9 of 12
Quote:
Originally Posted by skcorpio View Post

i understand 850w should be enough, but doesnt the capacitor decay over time? especially i run this thing 24/7 for 2+ years.
Caps are not tires, they don't degrade like that, and quality caps don't degrade at all if kept reasonably cool, even if the caps lost some capacitance(maybe you baked them) the unit will still be able to provide >95% of its rated output... which is still 200W+ more than you actually need wink.gif
Quote:
Originally Posted by skcorpio View Post

if the psu has PCIe power cables then shouldn't i use those instead of the molex ones?
Obviously.
Quote:
Originally Posted by skcorpio View Post

i will try to do a mobo bios update and replug everything to see if it works. do i need to reinstall windows after the bios update?
No need to reinstall windows or drivers after a BIOS update, you only need to redo your BIOS settings.
post #10 of 12
Thread Starter 
Quote:
Originally Posted by Unoriginal Sin View Post

Because there's nothing pointing towards such a conclusion.. your PSU can output a lot more power than your hardware is pulling under any gaming load.. it's probably an unstable overclock, CPU or GPU.. either way, I doubt it's your PSU.
Run Prime95 Large FFT and Furmark, run them individually for 5 minutes each and if you don't get any shutdown run them simultaneously for another 5 minutes and come back here with the results.

what settings should I run the furmark? Assuming I should do the burn-in test, do I turn on AA?
skcorpio
(16 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7-930 @3.8GHz ASUS P6X58D Premium MSI Radeon 6990 Corsair Dominator 3 x 2 GB 
Hard DriveHard DriveCoolingOS
Intel X25M 80GB Samsung F3 Spinpoint 500GB Thermalright Silver Arrow Windows 7 Professional 64bit 
MonitorKeyboardPowerCase
Samsung P2350-1 x2 Filco Brown Corsair 850TX Cooler Master HAF 922M 
MouseMouse PadAudio
Logitech G400 Artisan Hien Mid ASUS Xonar Xense 
  hide details  
Reply
skcorpio
(16 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7-930 @3.8GHz ASUS P6X58D Premium MSI Radeon 6990 Corsair Dominator 3 x 2 GB 
Hard DriveHard DriveCoolingOS
Intel X25M 80GB Samsung F3 Spinpoint 500GB Thermalright Silver Arrow Windows 7 Professional 64bit 
MonitorKeyboardPowerCase
Samsung P2350-1 x2 Filco Brown Corsair 850TX Cooler Master HAF 922M 
MouseMouse PadAudio
Logitech G400 Artisan Hien Mid ASUS Xonar Xense 
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