HD 7950 Overclock problem

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xalyy

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Jul 22, 2014
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Hello! I have a big problem. When I start to overclock and get to an actual OC state the FPS starts drop really badly.
Sapphire HD 7950 Default settings:
925Mhz core clock
1250Mhz memory clock
1.056 VDDC
At these state I get 56 FPS default. (65C maximum)

Test OC settings:
1080-1100
1400-1450
1.100-1.200 VDDC
These are the settings when I get like 65 FPS on furmark but after a minute it drops back to the default state like 56 FPS when I started.
(Even 75C+!!! Lol)
No matter what I do it happens, but the question is why?

Thanks all!
 
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Bresser

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May 1, 2014
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Well how high is your temp going during Furmark and what temp do you have your GPU to throttle at. E.g. The r9-290 (very likely it doesnt throttle at the same temp but it might) when it hits 95 degrees it throttles. Meaning in order to keep the temps there it will decrease your clock until it can stay at that temp.
 
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xalyy

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Jul 22, 2014
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But on test oc or on default?
 
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B

Bresser

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May 1, 2014
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For both. If the temp reaches the recommended safe temp it will throttle. So you could try going into MSI Afterburner and setting your fan speed to say 70% it will be noisy but may not reach your max temp with a modest overclock such as yours. Try running a test with your fan speeds set at 70% and tell me what your max temp is.
 
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xalyy

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Jul 22, 2014
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The fan speed is automatic so I don't think Its necessary to change it. I use Trixx not afterburner, afterburner not allows me to change voltage... :(
For the default settings it can't throttle why would if it doesn't go above 65C
Wow
It seems throttle down at
1145 Core
1470 Mem
1.200 VDDC
to 500 Mhz :O
Temp was 84 Celsius and I am sure it would even go higher.
 
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Bresser

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May 1, 2014
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The fan speed is automatic but most manufactures such as sapphire (my sapphire r9-290 does this) set the fan curve so that it stays quiet since that seems to be the popular desire in this market.

You do have a few options:

1. Set the fan curve manually

2. Downclock back to stock settings

3. Go AIO liquid cooling or Open loop.
 
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spladam

spladam

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Nov 23, 2011
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Anyone who come across this, and is having the same or similar throttling issue with the 7950 / R9 280, push your "power tune" setting (it's a TDP offset) to 15 or 20% and it will solve this.
 
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