Ok so I am looking at two dual core CPU's from AMD one is the 64X2 at 2.4GHZ and the other is an Opteron at the same speed. Now the L1 Cache is about the same on them but the Opteron has double the L2 cache. They both are Socket AM2 so that is not an issue. The 64X2 Athlon is about $40 less. I am not a hard core gamer. I do sometimes game but not often. I usualy use my computer for crusieng the internet,watching movies and for work wich is internet heavy! I have a spare XP lying around collecting dust so it time to build something with it. I already have a Athlon 64X2 laptop running XP and an AMD Athlon single core running XP-Pro and a core 2 Duo Intell Acer running Vista Premium Home so it is not like I am brand loyal. The Acer was just too good of a deal to pass up I usualy build all my own desk tops!