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

Last response: in Graphics & Displays
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November 16, 2012 10:01:05 AM

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:



November 16, 2012 3:28:38 PM

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-requi...]GPU power requirements[/url]

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.
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a c 107 U Graphics card
November 16, 2012 3:56:30 PM

That was my first guess also ( PS )........ low end low power junk. look at amps not watts.......... the video card........ old and used ... questionable.
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a b U Graphics card
November 16, 2012 4:12:31 PM

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
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a c 107 U Graphics card
November 16, 2012 4:22:36 PM

and forgot to mention monitor refresh rate if it actually meant anything at this point.
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November 17, 2012 4:26:01 AM

blacknemesist said:
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-requi...]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.
[/url]


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 :/ 
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November 17, 2012 4:28:59 AM

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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