Originally Posted by Burn
In all honesty Paul, I would get the 750, considering that higher power usage is supposedly the way of the future unfortunately :\\
I can't see myself ever using more than 25-28 Amps on the +12V (that is 300 - 336 Watts on the +12V alone) in a future quad core / single GPU / 4GB / 2-4 SATA / pump / fans setup.
Considering that a QX6700 / 8800GTX / SATA / 2GB / Fans only consumes a peak load of 263 watts
I believe that is from the wall too!
With that in mind, I do not see myself ever topping 300-400 Watts on a bad day. The OP650 can handle 648 Watts on the +12V alone. Power supplies are most efficient at loads greater than 50% and less than 90%.
A lower wattage PSU can handle almost any system as long as it is a quality PSU with high amperage rating. FCG can get his entire setup (X6800, CrossFire X1900XTX, 4 Raptors, 4GB memory, 2 pumps, fans, ect can run on a TurboCool 510.
The OP650 is a highly rated PSU by jonnyGURU. It got a 10/10 for performance. It had high amperage, low voltage fluctuation, non-existent ripple, and good efficiency.
The ONLY knock on the performance of the Olympia OP650 is the low efficiency when the power supply was unrealistically crossloaded with a high +3.3V/+5V load and only 2A on the +12V. Other than that, efficiency was very good, there's active power factor correction, voltage regulation was very good, there was minimal ripple and noise and the unit was very quiet under 40�C.
Because the crossload that yielded the 73% was very unrealistic, I'm not going to hold it against it. In fact, I'm not going to hold much against this power supply. It scores a 10 for performance. That's makes up 40% of the score.