Agree with the above that system as-is, is too limited, and little room for a viable gaming upgrade. Better to invest some more money into something like an older refurb I5 2500,3570k, or build an fx 6300 system with a budget gpu. If I were in the hurts for a decent gaming system but I had little cash I would get an fx 6300, Asus or Gigabyte value matx, 760g mobo, 500w antec or evga PSU, small case, 8gb ddr3 1333 value, and something like a gtx 750-750ti (or rx 460).
Shore if you can do it for $150 total with tax, though buddy system is missing a feu things so let put that at $275 with tax.
FWIW: I'd forget about dumping more money into that syste...and take a look at some of the refurbished systems at Amazon and such. The fact that these systems have been done by authorized refurbishers...makes them a better buy (IMO) than any aging system that users may be about to dump money into. Win 7 already installed.
Dout it unless you can link to a sorce that has better for $150 with tax or in this case seeing as buddy's system is missing a feu things $275 with tax.
As for the system OP is talking about for $150 ya that seems decent though i don't know why it only has a 140gig hdd, that's only good as a windows drive meaning you will have to get like a 1TB drive for it and that's more cash as well no dvd burner O_o what the guy trying to do and i don't like the screen its a TN screen and the image quality on a TN lcd is trash.
And the heat sink is what ? my self if i got that system i would put abandonware winXP for free on it and it would fly as well id try and unlock the last core on the cpu " its a black box cpu" as well as get a aggressive heat sink and pound on the mgz.