Compatibility question

I'm building a PC for the first time so I need to know whether the parts that I've ordered/am going to order are compatible. Just some background to this, I've bought all of the parts apart from my CPU and my GPU which I (should be) ordering tomorrow, but the site that I used to reference seems to have run out of stock of the graphics card I wanted so I can't really use it to check compatibility which has got me worrying. The site in question is So er yeah, will these parts that I've bought/am about to buy work together?

Intel Quad Core i5 2500k 3.3Ghz (not bought yet)
4GB AMD Radeon HD6990 (not bought yet)
16GB Kingston Hyper-X Dual-DDR3 1600Mhz
Asus P8P67 LE Rev 3.0
Titan Fenrir Evo Extreme heatpipe CPU cooler
1TB Caviar Green WD10EARX

Corsair 750W Enthusiast Series
Titan Fenrir Evo Extreme CPU cooler
X-Fi Titanium - Fatal1ty Champion Series

Also, what would be the limiting factor when it comes to the performance of the PC? I am considering overclocking the i5 2500k because from what I've seen, the HD6990 tends to be paired with an i7.
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  1. I believe the 6990 will bottleneck your system unless you OC the CPU to about 5+ GHz.
  2. azeem40 said:
    I believe the 6990 will bottleneck your system unless you OC the CPU to about 5+ GHz.

    So do you think I should upgrade my CPU to an i7?
  3. I'm not sure on that one. However, you could consider Crossfire of 6970 since that is better performance, and I don't think it would bottleneck. I am just using what I think so you might want a second opinion.
  4. Just realised I made a mistake in my original post, I actually have an 850W supply. I just checked on the site I mentioned earlier and it said that if I have 2 Hd6970s in Crossfire I would need a 1050W power supply, but I remember it not saying anything about needing a larger power supply with the single Hd6990 when I selected the 850W a little while ago.
  5. I have two 6950s and 750W is minimum I was recommended and 850W was average recommendation.
  6. Yeah, for some reason that website I used is saying that I need 1050W for two HD6970s and 850W for two HD6950s.
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