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6990/6970 Trifire vs 7970 - How much of a performance loss at 1080P?

post #1 of 15
Thread Starter 
Every game, like BF3 and Metro 2033 runs silky smooth at max settings and max ingame AA/AF (except Crysis 2 DX11/hi res patch, however, if I disable the 6970, it runs smooth. It's a trifire scaling issue). If I were to downgrade to a single 7970, how much of a performance loss would this be? Would I still be able to max everything at 1080P at greater than 60FPS?

I purchased the 7970 but it hasn't shipped yet and I can still cancel it. I'm just second guessing myself since I know it's a performance loss, but games might run better without microstutter issues.
post #2 of 15
If you put a decent OC on the 7970 it can keep pace with a 6990.
And they OC quite easily.
post #3 of 15
I dont know why everyone compares OC 7970 keeping up with not OCd 6990. Lets compare both OCd not just one.
post #4 of 15
As a rough estimate this is without testing and somewhat is speculation, since two 6970's are a little faster than a 7970 adding a third card would put them at around 140% faster than a 7970 and if you take a 10-20% loss (not sure if the loss for crossfire is increased with multiple cards, although I assume it would be. You'd probably end up at around 110%-130% faster than a 7970. Another thing that could give you a rough estimation would be just straight benchmark scores from a tri fire setup and a single 7970.
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post #5 of 15
a Oc 7970 can be 75-85% of a 6990
as a owner of a 7970 all i can say is wow i have mines clocked at 1275mhz and it runs battlefield on ultra with no problems
post #6 of 15
Could you please let me know how it turns out?
I'm debating to do the exact same thing.
This Tri-fire setup causes a lot of problems, especially with WoW...
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post #7 of 15
I had your exact setup and let me tell you that a single well overclocked 7970 will give you as smooth gameplay @ 1080p as the tri-fire setup.

In some games I experience a smoother FPS due to the microstuttering I would get with the tri-fire setup.

Thumbs up from me!
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post #8 of 15
I dropped my Tri-fire for a single 7970 (waiting on 7990 for trifire) and I'm not disappointed one bit. I play in eyefinity though and thats where the difference is truly amazing! For single monitor @ 1080 res if you're satisfied with your setup then no need to switch honestly. I personally would have switched regardless of eyefinity or not simply because I always want the latest technology biggrin.gif
    
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post #9 of 15
Quote:
Originally Posted by amputate View Post

Could you please let me know how it turns out?
I'm debating to do the exact same thing.
This Tri-fire setup causes a lot of problems, especially with WoW...

lol why would u use tri-fire in wow? tongue.gif
post #10 of 15
Tri-Fire 6970s @950/1400 are equal to TWO STOCK 7970s in Crossfire, so no you wont be able to get ANYWHERE close to the same FPS with 1 7970 as you did with 3 6970s. The 7970 is only about 40% better than 1 6970 if they're both OC'd to their respective maxes (1.1ghz for the 6970, and 1.25ghz for the 7970).

However TWO 7970s at STOCK, score around 13-14k in 3dmark11. I score 14-15k in 3dmark11 with my 3 6970s OC'd. I also get WAY better FPS in Battlefield 3 with my 3 6970s than anyone does with 1 7970, regardless of the OC. You have to OC a 7970 to hell and back (1400mhz+) just to come within 20% of a single 6990 which is slower than 2 6970s in Crossfire. The 7970 is a GREAT card, don't get me wrong, but it's not nearly as fast as some are making it out to be. I'm not satisfied with the FPS from 1 7970, as I run on a 120hz monitor. With my 3 6970s I'm almost always hitting my 120fps frame limiter on 64 player multiplayer maps, and when I do get slowdowns, it's only to around 70fps, which is 100% unnoticeable. If you're downgrading to a 7970, I wouldn't do it unless you plan on getting at least TWO of them since the 3 6970s will eat 1 7970 OC'd for breakfast.
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