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3x 6970 Same as 6990+6970? - Page 2

post #11 of 27
Quote:
Originally Posted by Hoodz;14598042 
The other thing is cause i have the 990 fx chipset will it make a big difference cause wont the cards run x8 x8 x8 where as the 6990+6970 will run x16 x16 not sure if thats right.

Like 1-2% difference between the two bandwidths.

Don't hesitate running 8x, it's more than enough.
    
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post #12 of 27
I believe that the 6990 has a clock speed of 830mhz and ram of 5000mhz. The 6970 has a clock of 880mhz and ram is 5500mhz. And its the 6990 that has the switch chich when flicked will increase to full 6970 speed.

I am looking to get a reference 6990 to Trifire with my 6970 Lightning, then i hope this thing will be lightning...!!
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post #13 of 27
You can see a trend of extremely high clock speeds for typical 6990 cards. Top tier binning for clocks & voltage. I was able to take a pair of 6970s beyond my current 6990 clock, but not by much. I was unable to take a separate pair of 6970s as high. Altogether, I'd say the 6990 is, inherently, superior to alternate though not identical configurations. Each Antilles PCB features an 48 lane plx pci-e switch provides full x16 lane interconnect; gpu to gpu, & gpu to pci-e bus. It was for this reason I upgraded from 6970s.
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post #14 of 27
That would be the warranty invalidation switch?
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post #15 of 27
Dual GPU cards like the 6990 require a x16 slot to function at full capacity and as mentioned before the 6970 won't even notice the difference on an x8
post #16 of 27
Quote:
Originally Posted by DragonCypher View Post
Dual GPU cards like the 6990 require a x16 slot to function at full capacity and as mentioned before the 6970 won't even notice the difference on an x8
So if i was to get a 6990, would i put this in the x16 slot and move my 6970 to the second pci-e which is x8?
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post #17 of 27
Quote:
Originally Posted by als008 View Post
So if i was to get a 6990, would i put this in the x16 slot and move my 6970 to the second pci-e which is x8?
Your x16 will also down to x8 though. So no real point.
    
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post #18 of 27
Quote:
Originally Posted by Crystal_Castles View Post
I've found that dual GPU cards generally don't overclock as well, so it could be a bit of a hit in performance, but at stock speeds they are basically 1:1.
this, single gpu cards are better with speed and temps
post #19 of 27
Quote:
Originally Posted by B NEGATIVE View Post
That would be the warranty invalidation switch?
Those are the ones we send to VideoCardShop
     
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post #20 of 27
From what I have researched, it seems that the general consensus is that 3x 6970 > 6990+6970 > 2x 6990(because apparently the 4th GPU doesn't scale well and can cause problems in-game).
Edited by Viper2 - 8/16/11 at 2:14pm
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