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[User review] AMD Radeon HD 7950 vs. HD 6950 1GB and overclock scaling...

post #1 of 14
Thread Starter 
Hi, I tested new Radeon card and comapred it to my HD 6950 1GB, I also overclocked it to see what are the perfromance gains and how far it will go. I tested two cards in few games and in Unigine Heaven to see the tessellation perofrmance. The overclock is not max. OC, it's stable for every day use, and reference fan @ 40-50% is enough to cool the GPU.

I did it on AMD based system with 960T processor @ 3.7GHz (not unlockable, so it's quad core), I think in some games processor bottlenecked this card, but not by much, so some results would probably be better on some Core i5/i7 system...

AMD Radeon HD 7950 pictures:
Warning: Spoiler! (Click to show)
IMG_8999.jpg
IMG_8998.jpg
IMG_8997.jpg
IMG_8996.jpg
IMG_8990.jpg
IMG_9008.jpg
IMG_9007.jpg
IMG_9006.jpg
IMG_9005.jpg
IMG_9003.jpg
IMG_9001.jpg

Test system:

AMD Phenom II 960T @ 3,7 GHz (NB @ 2600 MHz)
Gigabyte GA-990FXA-UD3
Kingston 2x2GB DDR3 @ 1600 MHz (9-9-9-24)
WD Black 1TB
OCZ SXS 600W

Graphics cards:
Powercolor HD 6950 1GB 800/1250MHz (Catalyst 12.1)
AMD Radeon HD 7950 800/1250 MHz (Catalyst 11.12 for 7900 series), 1200/1550 MHz overclocked
Warning: Spoiler! (Click to show)
IMG_9024.jpg
IMG_9020.jpg
IMG_9009.jpg

Edited by TheBear - 2/10/12 at 6:26am
post #2 of 14
Thread Starter 
Performance against HD 6950 1GB:

All of the games were tested using fullhd resolution and maximum settings (only in Metro, Advance DoF is disabled), and with 4xAA, with FRAPS running 60 seconds benchmark. I tested some demanding scenes with action and enemies so real in game performance would be better than this most of the time... Both cards were @ default clocks in all games.

Battlefield 3 is tested in singleplayer, not multiplayer.

UnigineHeaven.jpg

Metro_2033.jpg
Metro_2033_2.jpg

Crysis_warhead.jpg
Crysis_warhead_2.jpg

Crysis_2.jpg
Crysis_2_2.jpg

Battlefield_3.jpg
Battlefield_3_2.jpg
Edited by TheBear - 2/10/12 at 6:16am
post #3 of 14
Thread Starter 
HD 7950 overclock scaling

I found 1200/1550 MHz clocks to be stable, Vcore was set to 1.240V, and 40-50% fan speed is enough to cool the card. Thats +50% core speed, and +24% memory speed. Scaling should be better with some Intel processor, but I can't say how much, there was some bottleneck for sure, and GPU usage is not perfect in Crysis Warhead, but there are huge gains in performance, about +30% higher framerate. With this OC minimal FPS is similar to average FPS at stock speed.

Unigine_Heaven_OC.jpg

Metro_OC.jpg
Metro_OC_1.jpg

CrysisW_OC.jpg
CrysisW_OC_1.jpg

Crysis_2_OC.jpg
Crysis_2_OC_1.jpg

Battlefield_3_OC.jpg
Battlefield_3_OC_1.jpg
Edited by TheBear - 2/10/12 at 6:14am
post #4 of 14
i read bf3 requires more system ram - like 8GB helps.

i am curious what would your results would be with higher oc.

depends on your cpu cooler you can try these setting for 4GHz.

- set everything to default
- disable the following - C1E, Turbo, HT, Cool & Quiet., and Turbo V - if you have it.
- set your vcore to 1.38v or 1.4v (try 1.38 first)
- raise your Multiplier to 20
- the fsb should be at 200
- save and exit.

thanks +rep.
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post #5 of 14
The results are more pronounced in BF3 because it needs more than 4gb of system ram and more than 1gb of vram.
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post #6 of 14
Great Benchamarks. It just would have been great to have a 6950 2gb vs 7950 3gb redface.gif.
post #7 of 14
Thread Starter 
Quote:
Originally Posted by rdr09 View Post

i read bf3 requires more system ram - like 8GB helps.
i am curious what would your results would be with higher oc.
depends on your cpu cooler you can try these setting for 4GHz.
- set everything to default
- disable the following - C1E, Turbo, HT, Cool & Quiet., and Turbo V - if you have it.
- set your vcore to 1.38v or 1.4v (try 1.38 first)
- raise your Multiplier to 20
- the fsb should be at 200
- save and exit.
thanks +rep.

I tried @ 4GHz, my CPU needs high voltage, but there's no huge difference in results, I think it needs some Intel SB for the best possible results.
post #8 of 14
Quote:
Originally Posted by UltraHoboLord View Post

Great Benchamarks. It just would have been great to have a 6950 2gb vs 7950 3gb redface.gif.

I would like to see that as well. I just bought a 6950 2gb and my dad bought a 7950 3gb. Ill be showing him this comparison regardless. Good comparison TheBear

cheers.gif

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post #9 of 14
Thread Starter 
In fullhd there's no difference between 1GB and 2GB model, it's only nticeable in Battlefield 3.
post #10 of 14
Great review ! smile.gif
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