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7970 vs. 7950 - What am I missing with these OCs? - Page 2

post #11 of 29
Quote:
Originally Posted by DrJns View Post

I'm looking at an SLI/Crossfire upgrade from my GTX 570 (mostly because I hate that my card is non-reference so my water block only has ports on the bottom). The 7970 and 7950 are the newest cards, so they seemed like a good place to start. I was trying to compare the overclock potential and dollar value of each card, and I came across these two reviews from Guru of 3D:
7970: http://www.guru3d.com/article/radeon-hd-7970-overclock-guide/1
7950: http://www.guru3d.com/article/radeon-hd-7950-overclock-guide/
It looks like the 7950 has much more upward movement in its overclock. The stock P score from 3D Vantage is (obviously) significantly higher on the 7970, but when they are both overclocked to the max Guru could get them to, here are the results:
7970: P30939
7950: P30657
That's less than a 1% difference between the cards! I'm not extremely experienced on these things, so I'm looking for help:
If I'm willing to overclock my cards, is there any reason to get the 7970 over the 7950?????

Some games and tests are less shader intensive than others. I'm guessing Vantage is mostly ROP/frontend-limited.
3DMark11 is a more realistic benchmark for todays games rolleyes.gif
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post #12 of 29
Thread Starter 
Quote:
Originally Posted by Arni90 View Post

Some games and tests are less shader intensive than others. I'm guessing Vantage is mostly ROP/frontend-limited.
3DMark11 is a more realistic benchmark for todays games rolleyes.gif

In that case it's 9138 (7970) vs. 8999 (7950). That makes for a 1.5% difference.
post #13 of 29
Quote:
Originally Posted by DrJns View Post

In that case it's 9138 (7970) vs. 8999 (7950). That makes for a 1.5% difference.

Where did you get that 8999 score for the Radeon 7950? Mine clocked at stock 7970 speeds only gets 7491. I am having some issues in trying to get it overclocked past 925/1375. I can't seem to find any way to adjust the voltage on it. (Sorry if this seems like a thread jack, just curious as the 7950 doesn't seem as big an upgrade from my 6870 as I was expecting).
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post #14 of 29
Thread Starter 
Quote:
Originally Posted by Jonnykiv View Post

Where did you get that 8999 score for the Radeon 7950? Mine clocked at stock 7970 speeds only gets 7491. I am having some issues in trying to get it overclocked past 925/1375. I can't seem to find any way to adjust the voltage on it. (Sorry if this seems like a thread jack, just curious as the 7950 doesn't seem as big an upgrade from my 6870 as I was expecting).

Here's a guide that helps you overclock: http://www.guru3d.com/article/radeon-hd-7950-overclock-guide/. It also shows the benchmark numbers I posted.
Edited by DrJns - 3/7/12 at 9:21am
post #15 of 29
Quote:
Originally Posted by DrJns View Post

In that case it's 9138 (7970) vs. 8999 (7950). That makes for a 1.5% difference.
Actually, the 7970 was running at 1125/1575 while the 7950 was running at 1150/1575, so it's about 3.8% clock for clock. Not a huge difference, but it's there. The 7950 was also running at 1250mV to reach that clock, most 7970s will pass 1200MHz at that voltage. There's also the possible issue with powertune.

The difference is there, it's not big, but it's there.
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post #16 of 29
buy 7950 OC is good Cost/Price.
post #17 of 29
I was in same dillema, and i decided to go for the HD 7950, i could buy HD 7970, but then later on i couldt afford the CFX, but with HD 7950 i can, i bought Asus HD 7950 DCII Top that come preoverclocked to 900/1250.
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post #18 of 29
Thread Starter 
Quote:
Originally Posted by Arni90 View Post

Actually, the 7970 was running at 1125/1575 while the 7950 was running at 1150/1575, so it's about 3.8% clock for clock. Not a huge difference, but it's there. The 7950 was also running at 1250mV to reach that clock, most 7970s will pass 1200MHz at that voltage. There's also the possible issue with powertune.
The difference is there, it's not big, but it's there.

Do you have a link to an example? Statistically, regardless of the clock or power required, the 7950 will perform the same as the 7970 according to the reports I've linked. I'll get the 7970 if it can clock above 1200MHz.
post #19 of 29
Thread Starter 
Quote:
Originally Posted by sena View Post

I was in same dillema, and i decided to go for the HD 7950, i could buy HD 7970, but then later on i couldt afford the CFX, but with HD 7950 i can, i bought Asus HD 7950 DCII Top that come preoverclocked to 900/1250.

Have you tried to OC? What are your results?
post #20 of 29
Quote:
Originally Posted by DrJns View Post

Have you tried to OC? What are your results?

I am now on 975/1400, i have some problems with overclocking with more volts, i am currently working on solution.
Here is one 3d mark vantage score on 975/1400.
HD 7950
Edited by sena - 3/8/12 at 10:58am
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