It really depends on how many other items are started during system boot and what current the unit can output. Enermax
600W may not have the muscle.
PC Power & Cooling PSU's are on sale at Newegg
. The (red) 750W is $80 after rebate
; normally ~ $250 MSRP. Free Shipping.
There are ( still ) no better PC PSU's than the PC P&C ...
The PC P&C 610W unit has been running the GTX260^2 for ~ a month and the 750W will be very soon(a new system build).