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Will a 6990 pair well in Xfire with a 6970?

post #1 of 44
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I am curious about this since I was told by a shop keeper that putting faster card with a slower card will cause them both to operate at the slower cards speed. So willspending 700 on a 6990 be totally worthless in crossfire with a 6970? Should I just get another 6970 and save the money? I was trying to decide what 6970 to get. I see a lot about the MSI lightning being pretty good and already OC'd to 940/1375.

I am trying to sure my low FPS in graphic intensive games in eyefinity mode. In effect would I just have 3 6970's but running at 800mhz downclocked?

I really want to attain FPS of over 40 or 50 agian in eyefinity in games like crysis.
post #2 of 44
Just overclock them together and you'll be fine.
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post #3 of 44
shop keeper doesnt know what hes talking about.

6990 + 6790 = ~6970 TriFire

Your gonna have to overclock the 6970 chips on the 6990 to bring them up to match the single 6970 though. Well... you dont HAVE to
    
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post #4 of 44
Yes since they are from same gen as well.
 
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post #5 of 44
Yes, it is actually the best combination you can do with AMD cards right now, an HD6990 + HD6970 Tri-Fire combination is a beast setup and it will work WONDERS

Just make sure you keep the HD6990's switch to OC Mode for 880/1375 to make sure all 3 cores run at same speeds.
    
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post #6 of 44
Thread Starter 
Y ai figured he was just not saying it properly. So this would be a good idea if I want to regain high FPS in eyefinity at 5960x1080?

I am just unsure as to which maker is the best for the 6990. Most are around 720 dollars but for some reason Diamond is $820 and I cant figure out why. I keep seeing sapphire mentioned, but bascially I want who ever has the best RMA. Not sure if getting an MSI would be mest since I already have an MSI card.

Quote:
Originally Posted by rmp459 View Post
shop keeper doesnt know what hes talking about.

6990 + 6790 = ~6970 TriFire

Your gonna have to overclock the 6970 chips on the 6990 to bring them up to match the single 6970 though. Well... you dont HAVE to
post #7 of 44
Thread Starter 
Gotcha, so they alrady have a bios setting for an OC? I didnt know that. the issue is my 690 seems to perform rather low in benchmarks like Heaven compared to others with similar setups. I am seeing a max score of 1087 at 1920x1080 4x AA, tess normal. In eyefinity it drops way down to 407 at 5960x1080.

I am just trying to decide if I got another 6970 if it would be enough to kick the FPS up to 40+ in eyefinity on high settings in a crysis type game.

Quote:
Originally Posted by kcuestag View Post
Yes, it is actually the best combination you can do with AMD cards right now, an HD6990 + HD6970 Tri-Fire combination is a beast setup and it will work WONDERS

Just make sure you keep the HD6990's switch to OC Mode for 880/1375 to make sure all 3 cores run at same speeds.

Edited by Topgearfan - 5/4/11 at 11:12am
post #8 of 44
Make sure you get a 6970 not a 6790.
post #9 of 44
Thread Starter 
If I was dyslectic that may be a problem.lol

Quote:
Originally Posted by Riou View Post
Make sure you get a 6970 not a 6790.
post #10 of 44
Get two more 6970s for the price and have more performance.
    
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