8gb RAM for the ASUS Crosshair II Formula

[Konig-Wolf]

Hello,

I am planning on building a computer in the near future, based around the ASUS Crosshair II Formula motherboard and an AMD Phenom 9850 processor. I intend to run Windows Vista Ultimate 64-bit on the computer, and would like to go up to 8gb of RAM with this build.

My question is, for this board, what sets of RAM would be the best for building up to 8gb on this board? The Corsair Memory Configurator recommends these modules:

TWIN2X4096-6400C5DHX
TWIN2X4096-6400C4DHX
TWIN2X4096-8500C5DF*

*The ASUS website has only the TWIN2X4096-8500C5DF listed on their QVL list for memory out of sets above.


If I go with the two sets of the TWIN2X4096-8500C5DF, can I expect to run the modules at their full speed and rated timings? I've heard there are issues due to processor limitations at the current time that prevent a board with all it's DIMMs loaded from being able to run RAM at it's full speed. If so, what kind of speed can I expect from the modules, and what timing adjustments will I need to make in order to ensure system stability?

Also, are there any other sets that would be recommended for an 8GB configuration on this motherboard? My main desire is stability, followed by performance, so if I need to spend a bit more for a different module set, that's okay.

Thank you for your time.

BTW, if you need information on what the final build is going to look like, I'll post that here:

Motherboard: ASUS Crosshair II Formula
Processor: AMD Phenom 9850
RAM: Two sets of TWIN2X4096-8500C5DF (tentative)
Hard Drives: Three Western Digital Caviar SE16 WD6400AAKS 640GB (non-RAID)
Video Card: EVGA 01G-P3-1284-AR GeForce GTX 280 SSC Edition
Sound Card: Creative Sound Blaster X-Fi Titanium Fatal1ty Champion Series
Power Supply: Corsair CMPSU-1000HX
Optical Drives: Two LG 22X DVD±R DVD Burner with LightScribe IDE
Case: ******** Twelve-Hundred
Operating System: Microsoft Windows Vista Ultimate SP1 64-bit

[RAM GUY]

They will run great in that MB and CPU just you have to over clock the CPU to get the full speed of the memory.

[Konig-Wolf]

Originally Posted by RAM GUY

They will run great in that MB and CPU just you have to over clock the CPU to get the full speed of the memory.

How much would I have to overclock the CPU by in order to get their full speed? Would it be better to go with DDR2 800mhz modules, such as two of the TWIN2X4096-6400C5DHX or two of the TWIN2X4096-6400C4DHX? I would prefer not to overclock if possible, but if need be, I will.

[RAM GUY]

If you do not want to over clock the CPU then I would suggest TWIN2X4096-6400C4DHX for best performance. And the CPU would have to run at 266 Mhz to get the memory DDR1066.