pc8500 ram

Ok, so I have this build that is about 1-2 years old, and I'm curious how to get the most out of the Ram (or is it worth it?). Do I have to overclock it to get it to what it is rated? This build is not too bad, as it's my 2nd build, I'm just curious about the ram. In the bios, it only shows 800 mhz? I put some links of what I have (you might have to click details, to get the info), and some screenshots with CPU-Z.

Currently, I have a stock CPU fan, which I will switch, and I'm still deciding on the OS (currently XP Pro), but I do have Win 7 64 bit Pro, that I haven't installed/registered yet. Trying to decide on which OS to put on which build.

Anyway, I'd like any info/suggestions on what you think. I'm gone for the night, but I'll check in tomorrow (can't access this site at work!! ) Thx, in advance - sos

http://www.newegg.com/Product/Product.aspx?Item=N82E16820104038 <-- Ram

http://www.newegg.com/Product/Product.aspx?Item=N82E16813131595 <-- Motherboard

http://www.newegg.com/Product/Product.aspx?Item=N82E16819103471 <-- Processor