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[Tweaktown] 7870 Crossfire Performance

post #1 of 45
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Quote:
This is a really nice setup and for around $700 total you're getting some amazing power. We didn't talk about it heaps during our graphs, but comparing the setup to the more expensive HD 7900 setups in CrossFire, the results are quite interesting. While for the most part we can see the $900 HD 7950 CrossFire setup comes in about 20% faster than the HD 7870 CF setup, when you start to look at the numbers, you can see there's little difference between then when it comes to our games being playable.

http://www.tweaktown.com/articles/4597/amd_radeon_hd_7870_2gb_reference_video_cards_in_crossfire/index.html

Tweaktown 7870 CF review.

Didn't see any crossfire reviews in the 7850 / 7870 reviews thread.

Crossfire performance looks impressive. Now we just need to wait until they are released for sale in retail channels.
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post #2 of 45
Something doesn't seem quite right, so they are reducing the number of unified cores back from the 5800 series? I have a sapphire 5870 2gb e6 and it has 1600 cores, but out bandwidth is exactly the same. So they are bigger cores but far more efficient or what?
post #3 of 45
If it does come close to HD 7970 CF its because of Bottleneck not because its as fast. Nothing impressive here.
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post #4 of 45
just sold my two 480's biggrin.gif
post #5 of 45
Quote:
Originally Posted by Maelthras View Post

Something doesn't seem quite right, so they are reducing the number of unified cores back from the 5800 series? I have a sapphire 5870 2gb e6 and it has 1600 cores, but out bandwidth is exactly the same. So they are bigger cores but far more efficient or what?

yes, cores did quite change after 5xxx series. 6970 had 1536 stream processors and was much faster then 5870

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post #6 of 45
Quote:
Originally Posted by ZealotKi11er View Post

If it does come close to HD 7970 CF its because of Bottleneck not because its as fast. Nothing impressive here.

It's likely the games they tested or drivers. an i7 3960X @4.7GHZ should not bottleneck any dual gpu setup.
Edited by PureBlackFire - 3/7/12 at 9:24pm
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post #7 of 45
Quote:
Originally Posted by ZealotKi11er View Post

If it does come close to HD 7970 CF its because of Bottleneck not because its as fast. Nothing impressive here.

That is completely false. How do you explain an overclocked 2600k handling a sli gtx580 setup?
    
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post #8 of 45
Quote:
Originally Posted by veyron1001 View Post

That is completely false. How do you explain an overclocked 2600k handling a sli gtx580 setup?

580's are what, 20-25% slower than 7970's. Now, if someone could produce some CPU and GPU % usage while running these tests we could stop the pointless bickering. IMO that should be a standard procedure for high-end Crossfire/SLI benches.

And also, why don't they have any other SLI/Crossfire setups besides the 7000 series? And also, why no 7850 CF benches (also 6950 and 6970 CF to compare)? A minor annoyance I suppose.

One more point. See this bench: http://www.tweaktown.com/articles/4597/amd_radeon_hd_7870_2gb_reference_video_cards_in_crossfire/index10.html . About 10FPS difference between 7950 and -70, vs. 5FPS difference in CF. Similarly, the 7870 scales better in CF than both the 7950 and 7970 in this test.
Edited by jrbroad77 - 3/7/12 at 10:15pm
 
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post #9 of 45
Their power consumption figures are all over the place, especially with regard to idle consumption. I question the consistency of their measurements... But aside from that, the performance data was interesting.
     
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post #10 of 45
^^not minor at all. I would like all those comparisons as well.
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