I THINK!!! That if you have an odd amount of ram it nerfs the dual channel.
I just buil this one myself for around $1200
Vista 64
Amd64 Dual Core 5400+ (2.8 Ghz Overclocked @ 3.01 Ghz)
4 gig Dual channel Ram
160 HDD
Diamond Viper hd3870 Overclocked ( Getting 2nd Card in about 2 months)
600W PSU
MSI K9A2 CF-F AMD 790X CrossFire Chipset DDR2/1066 Dual 16X PCIE SATA RAID MB w/GbLAN,USB2.0,&7.1Audio
Apevia X- Dreamer mid tower
After getting the case i decide airflow would be horrible in this thing so i whipped out my Dremel and made a few mods to the case.Added 3 fans and replaced all the stock cooling it came with. Runs at Ambient tempatures! This thing plays everthing iv thrown at it including Crysis on high setting and runs Flawlessly across the board! Second GPU in Crossfire should only add to the over all speed.
Heres a couple pics:
Heres a pic of the wife.. She Helped!!! (Aint She cuuuuute)
the rig pics were taken with my Chocolate Cell phone so they kinda suc
