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Unusual GTX 8800 GTS Behaviour.. Do I Need A New PSU?

Hey all,

Just finished a new build

specs:
CPU: AMD FX-8350 @ stock
Hard Drive: Samsung Spinpoint 500GB 7200rpm
Motherboard: Asrock Z77 Extreme 4
Power Supply: Besta CoolerMax 500w ->> http://www.ebay.com.au/itm/271082930337
Ram: G-Skill 8GB (1x8GB) 1600Mhz
Graphics Card: EVGA GeForce 8800 GTS ->> http://www.ebay.com.au/itm/320999446327
Operating System: Windows 8 Professional 64 bit


Please read everything..

Heres my problem. At first boot i noticed the low res i was getting.. when i tried to change it, it only gave me the options of 1280x720 OR 1280x1024 (or something along those lines)
So i did as you would, and got the latest drivers for my card from nvidia..
Still no change.. only get the two options (on a 1080p monitor.. and yes the monitor works fine)
so i thought, why not try adjust it from nvidia's control panel, so i double clicked on the little green nvidia logo in the task bar and got this error:

"nvidia display settings are not available
you are not currently using a display attached to an nvidia gpu"

(btw this happened on the stock drivers as well)


When i tried to run cod4 I got horrible fps.. like 3-5 fps...

Yes i am plugged (with dvi) to my gpu, the motherboard doesnt have any video outputs, im guessing becuase the cpu doesnt have integrated graphics..

At first my psu didnt have a 6 pin, so i used the 6 pin from another psu (while that pc was on).. the psu i was using was 350w and yeh im guessing it just couldn't power it while it was powering the other computer (with integrated graphics btw)..

So i bought a 2xmolex to 6-pin converter cable so i didnt have to use the other computers 6-pin. When using this setup i get exactly the same problem.
- the molex connections were from seperate rails that werent powering anything else.
- the cable seems a bit weird - see pics below


What confuses me is that the graphics card works.. just with all these problems.. I read around about this issue and apparently for some people, a new psu fixes the problem...

I got my current psu from ebay, iv never heard of the brand, it was dirt cheap and i wouldnt be supprised if its a false wattage rating or something.
- see pics below of psu info

Do you think I need a new psu, i would really appreciate any advice..


Heres a bunch of images that might help you out:

Cpuz and Gpuz Screenshots:




The Build:



The Psu:



The 2x Molex to 6 pin Converter:



7 answers Last reply Best Answer
More about unusual 8800 behaviour
  1. WoW you PSU is really bad on the 12v end,only 17A!

    This is how much Amps should you have on 12v:

    [urlhttp://forum-en.msi.com/faq/article/printer/power-requirements-for-graphics-cards]GPU power requirements

    Can you try your card on a friends computer with a good PSU?
    The card doesnt have enough power to work properly,thats why it isnt even detected.
  2. That was my first guess also ( PS )........ low end low power junk. look at amps not watts.......... the video card........ old and used ... questionable.
  3. Best answer
    Well the PSU may be junk but also its a very old design when the +3.3V and +5V were being asked to handle the heavy loads. The 8800GTS is a 120 watt card so it will have about a 10 amp draw on the 12 volt rail leaving only 2 amps for overhead. Likely the PSU is the cause of your issues.


    Edit: for a laugh your PSU model exploding: http://www.youtube.com/watch?v=Em4PLzv2zSE
  4. and forgot to mention monitor refresh rate if it actually meant anything at this point.
  5. WoW you PSU is really bad on the 12v end,only 17A!

    This is how much Amps should you have on 12v:

    [urlhttp://forum-en.msi.com/faq/article/printer/power-requirements-for-graphics-cards]GPU power requirements

    Can you try your card on a friends computer with a good PSU?
    The card doesnt have enough power to work properly,thats why it isnt even detected.


    Thanks for the idea, ill try the gpu in my main rig, (currently running a gtx 580) so if it works in there, looks like ill need a new psu :/
  6. JamesSneed said:
    Well the PSU may be junk but also its a very old design when the +3.3V and +5V were being asked to handle the heavy loads. The 8800GTS is a 120 watt card so it will have about a 10 amp draw on the 12 volt rail leaving only 2 amps for overhead. Likely the PSU is the cause of your issues.


    Edit: for a laugh your PSU model exploding: http://www.youtube.com/watch?v=Em4PLzv2zSE



    Thanks for the detailed answer ;)
    and the video lol
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