Not getting the right timings with memory

Hi, I have 4 2GB CORSAIR XMS2 DHX DDR2 800
http://www.newegg.com/Product/Prod [...] -6400C4DHX
So when I first installed the memory I got timings of 5-5-5-18, well I wanted to get it down to the 4-4-4-12 which is what the memory is rated at. So I get in the BIOS and set the timings to what they should be (maybe I did it wrong), but after I set the timings I open up CPUZ and it says the timings are set to 4-4-4-10. Also in the BIOS I had to set the FSB/RAM ration to 1:2 to get the timings to go down to 4-4-4-12 in the BIOS if I kept it at auto the timings would only go down to 4-5-5-13 was the lowest it would go at auto. Is having the timing at 4-4-4-10 gonna cause stability problems? I've tried O/Cing to 3.5GHz just by upping the multiplier, and I got stability with prime95 for 3 hrs with no probs but when I play WoW for a couple hrs and then hop on to CoD4 I get the blue screen. So I backed it down to 3.2 till i get the memory thing figured out. I haven't yet ran memtest.

Here is my system specs:
-AMD PhenomII X4 940 @ 3.2GHz
-MSI K9A2 Platinum 790FX (updated the BIOS to latest version to get it to recognize the processor)
-2 CORSAIR XMS2 DHX 4GB (2 x 2GB) DDR2 SDRAM DDR2 800 (PC2 6400)
-EVGA GTX285 (yeah I know a nvidia board with a xfire MB)