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Old thread... Merged double posts...
Dell Dimension E520, QX6800 @3.45GHZ (13X266), 8GB DDR2, 240GB SSD, GTX750Ti O/C 2GB DDR5 (single fan versions)
D9729 heatpipe cooler bolts in, T9303 better but requires slight mod. to cover. Over 3.2 GHZ heatsink everything (easier said than done).
Software overclock using Throttlestop program. Controls vcore, and multiplier. also Speedstep etc.
Delta GFB1212VHG fits in stock cooler mounting, Trying for 3.73GHZ. (not tested yet)
Cheap and easy-QX6700, D9729, rock solid 3.2GHZ. 1.400 vcore (12X266)
BTW the fan I mentioned above draws 3.4A, and has 2 motors and 69Db at full speed (which you won't ever need).
ATX PSU's fit just fine.