What Should I Upgrade?

[Wiiings12]

I am looking to upgrade my PC, but I am not entirely sure what would produce the best results.

Here's the specs!

AMD Athlon 64 X2 @ 3.1 ghz
ATI Radeon 4830 @ 645/1920 mhz
ECS NForce9m-a Motherboard - Random crap mobo... But she gets the job done mighty fine!
4GB OCZ 1066 Dual Channel Ram - 32 bit OS so upgrading here wont do too much for me.
I have no idea what speed my HDD is, I know its a sata and thats about it! Pulled it from an emachine.

I am thinking i will either upgrade my CPU to a phenom x4, or get a 4870 since they are so dang cheap all the sudden! What would be the most notic-able upgrade between the two?

 

[nun]

well it depends are you a heavy gamer? What resolution do you play at

 

[Wiiings12]

I game fairly often. Would like to eventually upgrade to a 20-22 in. Monitor. I am gaming @ either 1280x1024 or 1024x768 at the moment.

 

[illegalmonkey]

Well it's limited by whatever socket your mobo has. If it's AM2 you can stick some Phenoms in there but not sure you'd see THAT big a difference. You could always go the route I did and actually build a computer Pick out a nice new mobo and get yourself into another brand of cpu or something. I went for an I7 920 from Intel and am pretty happy w/ it.