So I'm building a pc for free for me mates child. It will be a AMD set up. I have a ASUS AM 2 mobo and a ATHALON 64 X2 4800 cpu. I need a cpu so do I, 1) keep what I have and get a dirt cheap 4400 at £32 All other options give the 4800 to the new build. 2) get a 4850E 2.5 Ghz 1MB L2 45W, low power and £42 3) get a 5400 Black 2.8 Ghz 1 MB L2 65W, low power £60 4) get a 5600 2.8 GHz 2 MB L2 89W, more power £60 5) get a 6000 3.0 Ghz 2MB L2 125W, mega power £60 6) get a Phenom 9550 2.2 Ghz 95W more power £100 7) get a Phenom 9750 2.4 Ghz 95W more power £113 7) get a Phenom 9850 2.5 Ghz 125W mega power £125 I realise that the Phenoms will not use all the L3 cache as they are AM 2 + but they will give better performance in some applications that I use. They can also be used if I ever upgrade my mobo. All of the cpus above can be clocked for better gaming. The lowly 4850E can get to 3 Ghz so somwhere around 2.8 Ghz should be ok for it to run at when gaming. So is it worth spending on the Phenoms because of the upgrade path, getting a AM 2+ mobo later would give quite a decent rig and they should be compatible with AM 3. Do I get the lowly 4850E and clock it for gaming. Cheapest option.Lowest power use. The 5400 has low power use but low L2 cache while the 5600 uses more power but has more L2 cache. The 6000 sucks up power but is pretty darn fast. The lower power Phenoms with a tiny tweak will give decent gaming and can be tweaked to around 2.8 Ghz but will run hot. All the cpus will run on my mobo I have read so many reviews and tests etc that I simply can not make up me mind. An for the wise guys , yes I should have gone to Intel in the first place.