Good gaming budget pc?

i am on a $400 budget so i will also have parts that are old, but i already have.

cpu: intel pentium ( i dont know the exact module) already have $0
gpu: amd radeon hd 7770 $130
motherboard: asrock h61m-dgs $45
psu: 600w coolmax zx series zx-600 $45
case: old generic greyish colored case (already have) $0
ram: g.skill dual channel 4gig ddr3-1333 for $20

i dont need a monitor mouse or keyboard or os.

total: $240