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Will a 6990 pair well in Xfire with a 6970? - Page 4

post #31 of 44
Thread Starter 
That is what I thought too. Man I am going to have to change my computers name to Money pit O'despair(Because no one survives, the machine) It has already sucked one year of my life away. It may one day go as high as 3, but I really don't know what that would do to me.

Quote:
Originally Posted by kcuestag View Post
A good 850W PSU will handle a HD6990 + HD6970 setup

I have HD6970 + HD6970 and an 750W PSU and I've never seen the power draw above 420W.
post #32 of 44
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.
hi
excuse me for my bad english i m french
i install a 6970 to my 6990 today and i would like to know how do you to know if your 6990 is in switch oc mode
thank your for your reply
post #33 of 44
Quote:
Originally Posted by ambroisec View Post
hi
excuse me for my bad english i m french
i install a 6970 to my 6990 today and i would like to know how do you to know if your 6990 is in switch oc mode
thank your for your reply
Nothing to excuse you for, your English is great!

If the OC Switch is activated, then the HD6990 should have the clocks of 880Mhz Core and 1375MHz Memory.

Glad I could help you out.
    
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post #34 of 44
ok thank you for your help and i see my 6990 is not on mode oc ,so i switch to postion number 1 on the card actually switch on podtion 2
it is important to switch in oc mode for using with my 6970?
thx
post #35 of 44
Quote:
Originally Posted by kcuestag View Post
Nothing to excuse you for, your English is great!

If the OC Switch is activated, then the HD6990 should have the clocks of 880Mhz Core and 1375MHz Memory.

Glad I could help you out.
Its 880/1250 with the OC Switch
post #36 of 44
Quote:
Originally Posted by ambroisec View Post
ok thank you for your help and i see my 6990 is not on mode oc ,so i switch to postion number 1 on the card actually switch on podtion 2
it is important to switch in oc mode for using with my 6970?
thx
It is important because if you don't put the Switch in OC position, then the HD6970 will downclock to 6990's clocks.

All you need to do is activate the Switch in OC Mode, and make sure you OC the memory to 1375MHz too.

Quote:
Originally Posted by HiLuckyB View Post
Its 880/1250 with the OC Switch
Oops, my bad.
    
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post #37 of 44
Quote:
Originally Posted by Topgearfan View Post
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.
Turn off EIST (SpeedStep) from your 2600k and you will get better gpu scores. Trust
Edited by Scorpion667 - 5/6/11 at 12:47am
    
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post #38 of 44
If you pair a 6990 with a 6970, you need to switch the bios swtich from 2 to 1 (AUSUM mode). Then move the 6990 memory up to 1375. The 6970 can't clock down the memory setting to 1250 when I last checked.
     
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post #39 of 44
AMD clocks work independently. So they don't have to be the same clocks
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post #40 of 44
Quote:
Originally Posted by Hy3RiD View Post
AMD clocks work independently. So they don't have to be the same clocks
I'm not sure about that, because the 6970 was the weak link in my Tri-Fire. It would freeze or lock up my system and the fan would kick in 100% when running tests. This is when you drop it in and leave it as-is.
     
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