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How much do I have to OC the 7950 to match 7970 at stock?

post #1 of 10
Thread Starter 
Hi, does anyone know, approximately, how much I have to overclock the 7950 to match the stock speed of 7970?

Since the reference clock of 7970 is 925 / 1375 Mhz, do I just have to OC to those clocks?

Thanks
post #2 of 10
Clocks do not give the same performance. The 7970 has more shaders too. Clock for clock a 7970 will always be stronger. As far as 7950 oc to stock 7970 performance, ir probably should not take much more than the 7970 stock clocks. But a 7950 will still be a bit weaker with 7970 clocks.
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post #3 of 10
Quote:
Originally Posted by driedupfish View Post

Hi, does anyone know, approximately, how much I have to overclock the 7950 to match the stock speed of 7970?

Since the reference clock of 7970 is 925 / 1375 Mhz, do I just have to OC to those clocks?

Thanks

You would need to overclock a HD7950 @ ~ 975/1375MHz to match a stock HD7970.

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post #4 of 10
Thread Starter 
Quote:
Originally Posted by KingT View Post

You would need to overclock a HD7950 @ ~ 975/1375MHz to match a stock HD7970.

CHEERS..

So the HD 7970 is just stronger by about 5% in performance at the same clock as the 7950 ? Is that what your figure is base on?
post #5 of 10
I have a HD7950 and I know from my own experience that there's ~ 5% difference in performance clock for clock between these two cards.


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post #6 of 10
Quote:
Originally Posted by driedupfish View Post

So the HD 7970 is just stronger by about 5% in performance at the same clock as the 7950 ? Is that what your figure is base on?

On average, yes - 5%. Sometimes more, sometimes less or even no difference. Depends on software.
post #7 of 10
Quote:
Originally Posted by glina View Post

On average, yes - 5%. Sometimes more, sometimes less or even no difference. Depends on software.

correct. the range varies from 3 - 7% depending on the game. you probably would need a HD 7950 at 1 Ghz to match HD 7970(925 mhz) in all cases. in few games where clock for clock diff is 3% HD 7950 would edge ahead at 1 Ghz.
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post #8 of 10
you need exactly 160 mhz extra on the core to match a 7970 @ %100 usage...

So lets say

7970 @ 1000 on the core
You would need a 7950 @ 1160/1375..

This of course is on computing apps like hashcat which utilize hardware resources more than a game its the closest thing i have used to utilized all the power of the card in one shot... Not even a game use this much hardware resources..

Now real case scenario it depends game to game..

100% vs 100% would be around 160mhz above 7970 core clock..
Edited by zGunBLADEz - 2/19/13 at 6:07pm
post #9 of 10
Quote:
Originally Posted by zGunBLADEz View Post

you need exactly 160 mhz extra on the core to match a 7970 @ %100 usage...

So lets say

7970 @ 1000 on the core
You would need a 7950 @ 1160/1375..

This of course is on computing apps like hashcat which utilize hardware resources more than a game its the closest thing i have used to utilized all the power of the card in one shot... Not even a game use this much hardware resources..

Now real case scenario it depends game to game..

100% vs 100% would be around 160mhz above 7970 core clock..

160 on the core sounds like a large number for gaming.
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post #10 of 10
as zGunBLADEz said, this is only in computing.
7970 has ~16% more shaders which makes it this much powerful in SOME cases. This can happen only in scenarios with uniquely simple loads, no bandwidth or interface constraints - such as mining.
Games have textures, geometry and generally more complex loads where you cannot just take raw specifications and scale them. It's ~5% in gaming, as numerous reviews have shown.
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