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PSU insufficiant or faulthy GPU?

Last response: in Components
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September 1, 2011 12:44:30 AM

Hi all,

I recently build a new computer. In windows everything works fine but when i try to start a game the GPU (HD6870) crashes to a black screen.
I tried everything to fix it without any results. To my last resort I went playing with the GPU voltage. Increasing it didn't help but even made it more unstable. So i decreased it from the standard 1200mV to 1130mV.

To my biggest suprise this has a positive inpact on the GPU. I could start my games and play for a couple of minutes before it crashes. I tried lowering it a bit more but it became unstable as a result (witch is normal because it doen't get enough power to run properly).

Now i'm wondering what i should do to fix this problem. Is there something wrong with the card that it can't bump the regular voltage or does the PSU deliver not enough power? Should I buy a better PSU or should I RMA the card. I don't know where the origin of the problem lies. (It has nothing to do with heat, temps are low)

Here are the Specs of my system: (nothing is overclocked)


-ASRock 880GMH/U3S3 motherbord
-AMD Phenom II 965 Black edition (125w version)
-ATI HD 6870
-2x4GB DDR3 @ 1600 mhz
-1 DVD/CD drive
-2 regular S-ATA HDD


Here are the specs of my PSU:


Ultron UN-550G Green Force 550W


- ATX Version 2.2 power supply
- Passiv PFC
- 2x 6-pin connectors
- 2 x 12V rails @ 19A / 400W 12V rail output


AC output:______________________________________230Vac 5A_________________________________________


DC output:____+3,3V________+5V___________+12V(1)_________+12V(2)_____-5V______-12V________ +5Vsb
_____________16A__________25A____________19A_____________19A_______0,5A______0,8A_________2,5A
Max. Current: --------130W---------_____________-------------400W-----------_______-------12W--------_______12,5W


Total wattage: 550W

I already tried an PSU calculator. I came on a total of 530W but I don't know if my Amps are sufficiant.


I would be really gratefull to hear a convenient answer :) 


Thanx on advantage and sorry for my bad english.
a b ) Power supply
September 1, 2011 9:06:57 AM

From its specification the power supply should be OK but I suspect its not giving the power it should as its an unknown brand
September 1, 2011 10:31:59 AM

I see.. This is like gambling to me because if i spend 100 bucks on a Quality PSU and it turns out it is the GPU after all I wasted 100 bucks for nothing as I am on a tight budget right know. Thanks for your reply
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