Ram compatibility question

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Basically, I'm running Corsair 2GB DDR2 XMS2-6400C4 TwinX (2x1GB) at stock voltages...It's 4-4-4-12 @2.1.

It looks like OCUK only stock the CAS5 version of this RAM in a 4GB kit, but I want CAS4, obviously. My question in two-fold:

Are Corsair RAM sticks good enough to run at 4-4-4-12, even though they're only certified to run at 5-5-5-15?

Perhaps I should buy another 2x2GB kit. I was thinking OCZ 4GB (2x2GB) PC2-6400C4 800MHz Reaper HPC Enhanced Bandwidth Edition Dual Channel DDR2 (OCZ2RPR800C44GK) I know it's only 4-4-4-15, but the because the voltage is about the same as the Corsair, I should be able to get it to run in Dual-channel...I'm trying to get 6GB of ram here.
 
Ideally, you don't need to mix and match different types of memory. So, in this case mixing the CAS4 and CAS5 Corsair is not a great choice. But, it will most likely work even though it is not guaranteed.

If you do, you need to run them all 4 at CAS5, the latencies of the 2 slowest modules. Also, I would not suggest mixing them with another brand if you can avoid it.
 
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