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6990 bottleneck?

Masterdeadly

Masterdeadly

Masterdeadly

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Joined
29 Jun 2010
Posts
1,552
Location
England
I tried 2 months ago 6950 crossfire and when I tried to play Battlefield 3 my GPU's were limiting themselves to 45 per cent each which I thought was a typical bottleneck.

So would a 6990 which is even more GPU power than 6950 cf as it's two 6970's - Surprising me how a 955 is already starting to bottleneck GPU's.

Also will my TX 650 Watt be able to power a 6990 as the review on bit-tech shows a Asus 6990 on peak drains 300W so I hope I can use my PSU.
 
If it's going to bottleneck I'll get
Gigabyte Z68AP-D3 Intel Z68 (Socket 1155) DDR3 Motherboard REV 1 [GA-Z68AP-D3]
Intel Core i5-2500K 3.30GHz (Sandybridge) Socket LGA1155 Processor - OEM [BX80623I52500K]
And the 6990 :D

I just hope my 955 won't bottleneck it.
 
your cpu at 3.6Ghz will bottleneck somewhat, get in the bios and kick it up to around 3.8-4Ghz to let your card stretch its legs :)
 
As long as you're going to overclock the i5 2500k :p

I don't know the performance of your CPU so not sure if it's much of an upgrade though I'd imagine it would be
 
Although the 2500k is better than your chip, i'd just overclock your current rig and see if you can lose the bottleneck on the 6950cf, it isn't hard to do; read a few online guides for your mobo and go from there!

The 6990 will be more hassle than 6950cf as they'll probably run cooler and faster due to two separate boards.
 
I have that CPU (@ 4.0ghz) and it doesn't come close to being bottlenecked by my GTX 580, that's all I can say not sure on CF cards - I don't think it would be a lot if much though.
 
I don't have the other 6950 it was returned because it was my brothers. And I really don't feel confident overclocking my CPU then still seeing bottlenecking.
 
So no one noticed the trying to run a 6990 /6950 xfire on a 650 watt PSU? :p

That's really not enough for two of those GPUs, 750 watt would be an advisable minimum, preferably 850 watt.

Your graphics cards aren't the only things in your PC that need power.
 
Masterdeadly said:
300W for the 6990
125W for the processor
1 HDD and 1 CD/ROM drive.
Click to expand...

You may want to rethink that a lot!!!!!!!!

http://www.hardwarecanucks.com/foru...s/41404-amd-radeon-hd-6990-4gb-review-21.html

power.png
 
zuludawn said:
You may want to rethink that a lot!!!!!!!!

http://www.hardwarecanucks.com/foru...s/41404-amd-radeon-hd-6990-4gb-review-21.html
Click to expand...

Masterdeadly may have over simplified it but the OP's PSU should be fine.

Based on the chart the HD 6990 system draws 469W from the mains which would equate to 422W from the PSU assuming 90% efficiency.

The Corsair TX 650W can output 624W on the 12V rail where nearly everything is powered from.

422W/624W equates to the PSU operating at ~68% of it's rated 12V output (or ~65% of its total output) so it should be fine.

The HD 6950 CrossFire sytem draws slightly less power.
 
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