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X2 6990's or 6990 + 6970 in trifire

post #1 of 19
Thread Starter 
ok big question here. for my new rig should i crossfire two 6990's or crossfire a 6990 and a 6970. All will be water cooled on a 3 24" monitor setup. My biggest concern is how well each hardware setup will behave as far as stability and performance (in that order of priority). So i would like to know the pros and cons of these two setups.
thanks guys!
the new system will consist of:
FX-8170 Bulldozer CPU
Crosshair V
1200w power supply
plus other components but these are the manin factors here
Edited by JRHudson - 10/4/11 at 5:51am
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post #2 of 19
Don't. You will be bottlenecking so bad... bulldozer is almost out!
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post #3 of 19
Thread Starter 
Quote:
Originally Posted by insyxion View Post
Don't. You will be bottlenecking so bad... bulldozer is almost out!
well i plan on using the FX-8170 CPU in the build also, would that not help the bottleneck issue?
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post #4 of 19
Quote:
Originally Posted by JRHudson View Post
ok big question here. for my new rig should i crossfire two 6990's or crossfire a 6990 and a 6970. All will be water cooled on a 3 24" monitor setup. My biggest concern is how well each hardware setup will behave as far as stability and performance (in that order of priority). So i would like to know the pros and cons of these two setups.
thanks guys!
Quote:
Originally Posted by insyxion View Post
Don't. You will be bottlenecking so bad... bulldozer is almost out!

@insyxion: You should read stuff more carefully. Read what I have bold above.

@OP: Quad should beat Tri, but if you have a big enough case and a good mobo you can easily do Quad of 6990+2*6970.
Taking this in consideration and the setup your trying to achieve I would recommend the Tri-fire and if you think it is not enough you can add another 6970. Hopefully the mobo supports it, if not well... I guess you could do 2*6990 Quadfire.


Quote:
Originally Posted by JRHudson View Post
well i plan on using the FX-8170 CPU in the build also, would that not help the bottleneck issue?
He didnt read the part where your doing a brand new build and not simply upgrading, dont mind him.
post #5 of 19
Thread Starter 
Quote:
Originally Posted by Tokkan View Post
@insyxion: You should read stuff more carefully. Read what I have bold above.

@OP: Quad should beat Tri, but if you have a big enough case and a good mobo you can easily do Quad of 6990+2*6970.
Taking this in consideration and the setup your trying to achieve I would recommend the Tri-fire and if you think it is not enough you can add another 6970. Hopefully the mobo supports it, if not well... I guess you could do 2*6990 Quadfire.



He didnt read the part where your doing a brand new build and not simply upgrading, dont mind him.
Well that is a very vailed point concerning wether the motherboard can support it. the case by the way is a Case Labs TH10
So would i be right if i was to say you are suggesting a 6990 + 6970 may be a better set up as far as stability goes?
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post #6 of 19
Quote:
Originally Posted by JRHudson View Post
Well that is a very vailed point concerning wether the motherboard can support it. the case by the way is a Case Labs TH10
So would i be right if i was to say you are suggesting a 6990 + 6970 may be a better set up as far as stability goes?
Yes the Tri-fire would bring good stability and good overall performance, if the performance wasnt good enough you could add another 6970 for the QuadFire, the price would be bellow the 6990 QuadFire and the performance would stay in front of it, since the 6970 have a higher stock clock and most likely better overclocking performance.
Also dont worry the cards wont downclock to the 6990 clocks, that does not happen on ATi anymore.
This is what I would do, TriFire. If it isnt enough I would stick another 6970 and be done with it.

EDIT: Saw your edit, you can support 2*6970+6990 QuadFire in case you need to.
Go with TriFire.
Edited by Tokkan - 10/4/11 at 6:11am
post #7 of 19
Thread Starter 
Quote:
Originally Posted by Tokkan View Post
Yes the Tri-fire would bring good stability and good overall performance, if the performance wasnt good enough you could add another 6970 for the QuadFire, the price would be bellow the 6990 QuadFire and the performance would stay in front of it, since the 6970 have a higher stock clock and most likely better overclocking performance.
Also dont worry the cards wont downclock to the 6990 clocks, that does not happen on ATi anymore.
This is what I would do, TriFire. If it isnt enough I would stick another 6970 and be done with it.

EDIT: Saw your edit, you can support 2*6970+6990 QuadFire in case you need to.
Go with TriFire.
ok that all makes alot of sense and links together other information i have come accross concerning the occcasional "buggy' nature on 2X 6990's. Of course the factors for a unstable sytem are many, but from what i have under stood the 6990+6970 beats out the 2X 6990's by the standards I'm going by. thank you for taking the time to discuss this with me.

I'm open for other pros, cons, opinions, ideas from others though because this is a subject of considerable interest to me.
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post #8 of 19
Both set-ups are great choice honestly.

6990+6970 Tri-Fire is now rock-stable and crazy fast. In my experience, just like Nvidia, AMD Quad GPUs scaling is not fantastic. But some people are getting great results. But going from 3 to 4 GPUs doesn't give you that much, be it AMD or Nvidia. 3 GPUs is the sweet spot right now in both camps.

For 3X24'', 6990+6970 would be perfectly fine.
    
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post #9 of 19
Thread Starter 
Quote:
Originally Posted by Levesque View Post
Both set-ups are great choice honestly.

6990+6970 Tri-Fire is now rock-stable and crazy fast. In my experience, just like Nvidia, AMD Quad GPUs scaling is not fantastic. But some people are getting great results. But going from 3 to 4 GPUs doesn't give you that much, be it AMD or Nvidia. 3 GPUs is the sweet spot right now in both camps.

For 3X24'', 6990+6970 would be perfectly fine.
Ah yes you hit it right on the head of my suspicions! Tri-Fire is NOW rock-stable i think is a very good evaluation of the situation. An my suspiscions are also correct that quad can be a pain sometimes.
THANK YOU ALL for taking the time to talk with me about this issue! Though I'm currently deployed my wife will be sending me some good pictures of my new hardware come real soon and i will start my build log.
If anyone is interested the build log for her computer is on OCN and its called "Hers" by JRHudson. Go check it out! I plan on making this system just as beautiful as that one, but for "him".
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Phenom ii x6 1090t @4.2 NB@3.0 Asus Crosshair IV Formula X2 Gigabyte 6970's 2X4GB G.Skill Flares 
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Phenom ii x6 1090t @4.2 NB@3.0 Asus Crosshair IV Formula X2 Gigabyte 6970's 2X4GB G.Skill Flares 
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post #10 of 19
I would go for 2 x 6990, 2 waterblock for 4 GPUs. More GPU power is better than less (some might not agree). Nothing to complain with this setup myself on the old x58 chipset. Don't know anything with Bulldozer though.

Quad-fire is not a gurantee to max all out for all available games in Eyefinity. Metro 2033 and Crysis 2 (Dx11 all Ultra) being two of them. VRAM is not an issue for Metro 2033 but see Crysis 2 hit 2GB limit per GPU.

Also, not all games are scaling more than 2 GPUs.
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