|Although the board supports that memory, the cpu you chose doesn't.|
* A high-bandwidth, low-latency integrated memory controller
* Supports PC2-8500 (DDR2-1066); PC2-6400 (DDR2-800), PC2-5300 (DDR2-667), PC2-4200 (DDR2-533) or PC2-3200 (DDR2-400) SDRAM unbuffered DIMMs – AM2+
* Support for unregistered DIMMs up to PC2 8500(DDR2-1066MHz) and PC3 10600 (DDR3-1333MHz) – AM3
* Up to 17.1GB/s memory bandwidth for DDR2 and up to 21GB/s memory bandwidth for DDR3
o Benefit: Quick access to system memory for better performance.
The amount of Ram you NEED depends on what you want to do with your machine, and can the OS use it. Win 7 32 bit still only utilizes 3.5 gigs of ram as compared to the 64 bit version which will use more than 4 gigs. Sam thing for XP. A quad core processor is not necessary for most software apps or games. The new Black ops requires a triple core psu. As far as smooth goes, if all your parts sync, any machine will run smooth. Do a little research on your own before you put the machine together. And don't be a smart ass.