New system with AMD 8350 CPU and 7870 GPU only getting 5 - 10 fps. Power supply?

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hempson

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Nov 5, 2013
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I just received my new system components yesterday.

AMD 8350
Sapphire 7850 2g GDDR5 oc
ASUS m5a97 r2.0 le

I am using my older 500w ocz PSU with a single pcie connector. I'm using the provided four pin to 6 pcie connected for the second gpu connection.

Only getting 5 - 10 frames in games, even on low settings. No others problems with the system other than this.

I have looked around online to see if an insufficient power supply could cause this problem but have not found an answer. Could this be the case? Is it possible that the GPU is going into some sort of idle mode when it can't draw enough power? Why would this result in low fps and not an error?

I re-installed my old 460 GTX and it's fine. So I don't think there is an issue with anything else on my system.

Any help is appreciated. Thanks.
 
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Outlander_04

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Nov 18, 2008
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Usually you would get an onscreen warning the gpu isnt getting enough power

Your problem is with your installation of windows or the graphics driver . Did you clear out the old nVidia driver and all its components before you installed the radeon driver?

Did you install the mb driver software?
 
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hempson

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Nov 5, 2013
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I did a fresh install of windows 7 64bit after building the new system. I installed latest drivers for my new 7870 after setting up windows. No nvidia drivers were on the system at that time. I also installed all motherboard drivers.
 
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shopperen

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To answer your questions. The reason you might get the low FPS because of insufficient power available is, that when the graphics card does not get enough power, it clocks down so to say, until it reaches a level where it can operate without getting damaged. But that will only last so long, after a while the GPU will take damage from insufficient power.

There could be several reasons. I once had an almost opposite problem. I went from AMD Radeon to NVIDIA GeForce. The screen resolution was crap (could not run above 1280x768) and no games could run, I just got a warning that there was a driver issue. I had to reset my BIOS, apperently there was an issue with the designated power scheme.

Another reason could be that the AMD Radeon 7850 is simply defect, do you have the possibility to test the graphics card in another system?

The Mainboard might have a problem delivering enough power through the PCI-E slot, as the the Radeon 7850 requires more power then a GTX 460. Try putting the Radeon card into the second PCI-E slot.

The last reason is, that your suspicions are correct, and the power supply unit is not powerful enough. I would choose as minimum a 650W PSU for that CPU and GPU, depending on how many HDD's are used in the system.
 
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hempson

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Nov 5, 2013
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Thank you for your reply. I will try using the card in the second pcie slot and see if that makes a difference. I think the card may be clocking down as you stated. When I start a game the frame rate for the into and menus seem fine, as soon as the gameplay starts the frame rate shows high at over 100 and then straight away drops to 5 - 10 and stays there, even if you change the settings.

I have ordered a new 750 corsair power supply in the hope that this will correct my problem.
 
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hempson

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Nov 5, 2013
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The link you supplied does seem to suggest that my PSU would be sufficient and as previously stated, my GTX460 is running fine on the new system. The specifications on the 7870 graphics card do recommend a PSU with two 6 pin connectors and mine only has one, does this make any difference? Or do graphics cards not mind if the connections they are receiving are from converted 4 pin connectors?

Aside from deleting and re-installing drivers, what else could I check? You mentioned it could be a software problem?
 
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hempson

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Nov 5, 2013
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When I first installed the new components my old card used a two 4 pin to one 6 pin connector, so I used this. I experienced the problems above so then decided to try the one 4 pin to 6 pin pcie that was provided with the new 7870 card. The performance was the same either way.
 
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