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Upgrading to 2 ATI 6990's and want some advice - Page 2

post #11 of 22
I wouldn't do it.

HD 6990s are the worst micro stuttering cards I've ever used and two of them would be even with good hardware a nightmare. If you want to up your horsepower get a single HD 6970 to compliment the HD 6990. I ran the exact same 3-Way Crossfire set-up a while back and it helped with the HD 6990. Would never recommend another to get double the bad performance.

Honestly though you'd be better off selling yours and getting a HD 7970.
    
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post #12 of 22
6990s are stuttering demons. I wouldn't get another one, as performance gains weren't precisely linear either with them. 3rd card scaled relatively okay, fourth... Barely did.
   
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post #13 of 22
Also some flight sims (well XPlane) don't make use of multi gpu setups so there would be no performance gain with that one
 
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post #14 of 22
Quote:
Originally Posted by thestache View Post


HD 6990s are the worst micro stuttering cards I've ever used

Really ? I have this card for over a year and haven't seen anything so far.
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post #15 of 22
On top of a new mobo and CPU, you would need a new PSU as well for 2 6990s.
post #16 of 22
Quote:
Originally Posted by Pawelr98 View Post

Really ? I have this card for over a year and haven't seen anything so far.

I think you might have gotten used to it.

Doesn't happen all the time but out of any card I've used it did it the most often and the worse. Look up frame time reviews and benchmarks for the card compared to the GTX 690 and you'll see how bad it can be at times.
    
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post #17 of 22
Id sell the 6990 while you can - and either get a 7970 and hopefully have enough to think of a CPU upgrade. If youre set on getting 2 GPUs..then maybe SLI 670s or something.

An overclocked 7970 will be on par or even beat 6990, esp on Beta 13.3 - i used to have CF 6970s and i prefer my single 7970 by a mile.
post #18 of 22
If money is not an issue, sell everything and get yourself a new intel i5-i7 ivy or wait till haswell and get your self 2x7970's and that alone will smoke the stuttering 2x6990's + 1090t into oblivion.

At one point I had 2x6990's and were prob the worst multi gpu setup I ever had, HORRIBLE GPU usage. I just about had better fps using a single 6990....
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post #19 of 22
Quote:
Originally Posted by berniemansell View Post

thanks for the advice
I have been planing on upgrading the CPU thats why i just purchased this mobo. I am thinking the AMD AM3+ x8 FX-8350 4.0Ghz/8Core/16M/125W but before hand want to crossfire the 6990 and get 2 of
http://www.pccasegear.com/index.php?main_page=product_info&cPath=207_314&products_id=19506
to keep it quiet. I know that i'll need a new case but i don't want to send any more money on this pc after this. so I want the best options as until i have enough money. this PC will be used as a dedicated flight/driving sim with 3 monitors.
Then I will be building a next gen AMD PC, I do love AMD

Just FYI but a 5ghz 8350 is still going to bottle neck 2 6990's. Badly depending on the game. AMD's current chipset isn't doing any favors either.
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post #20 of 22
If you decide to sell the 6990 do it sooner rather than later as it will only decrease in value when the new hardware comes out or is nearly out
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