Hey Matt! the QX6800 will work, but I cannot guarantee that the RAM will *automatically* adjust to 1066 MHz. Go into your BIOS > MB Intelligent Tweaker, and select the proper CPU:Memory ratio. It should probably work automatically, but just in case not, go into MIT.
A Q9550 will be your best bet. A 1333MHz FSB will handle DDR2 1066 RAM, and handle it well. It's also pointless to get an Extreme Edition processor if you do not want to overclock.
Get the Q9550 if its cost effective your ram will be fine bus speed and ram dont work the way you think. The Q9550 has a 1333 fsb and a core clock of 3.0ghz. The FSB runs at 333 mhz quad pumped which gives you a bus speed of 1333 mhz and then it has a multiplier of 9 which gives it a 3.0ghz core clock. Now lets just say your ram would run at 1:1 ratio at 1:1 your ram will only actully be running at 667 mhz. But you can change the ratio to make it run faster. I know im prob over your head on this so just trust me it will work and it will work great. :-)
well, i picked up the Q9550 like what both zenosys and saaiello recommended.
haven't really had too much time to play around yet, but i did go into cpuid and i see the memory is still showing pc2-6400 (400 MHz). part number OCDZ2G10662G.
How do i get the memory to run at its rated 1066? how do i change the "ratio" to get it up to what its rated for? how much of an increase can i expect in performance, its there any risk to doing this like overclocking a processor?
You can go ahead into your BIOS > MB. Intelligent Tweaker > and change the memory:CPU Ratio. I'm not entirely sure how vast the gap of performance is between 800MHz and 1600MHz. If you clock high (beyond the rated speed of 1066MHz), then you are effectively overclocking the RAM. The same rules apply to OCing a CPU, give or take.