the HD4770 is good but that X4 no point la. you get 4 cores but drop in speed.

if you need to upgrade, aim for a higher clock speed X2 like those around RM 200 - 300 range.

edited : oh, new processors may not work that well. so you can get stuff like X2 5200+ used unit.

what games do you play?

going from 2ghz to 1.8ghz feels similar, in most cases it's a downgrade.

you can't. that's why i say it MIGHT be a downgrade because I'm not certain at the time of the post. also forgotten that they're of different architecture

now the 2 concerns could be

a) whether TS would feel the difference
b) whether the mobo can support the X4 9150e (someone do a search on it? )

oh, if you got the 3600+ to 2.5ghz already then I suggest you just stick to it.

it's good enough at that speed and doesn't warrant you changing to others like X2 5200+ and or higher range processors. the difference would be minimal.

sometimes just need to adjust the board and card.