OCZ ModXStream Pro 600 W proved to be an outstanding mainstream 600 W power supply, surprising us at all and every level. Being an inexpensive unit that has only the standard 80 Plus certification, we were expecting it to achieve efficiency around 82-83% across the board, but in fact it could maintain efficiency between 83.5% and 86.6% when we pulled up to 480 W from it (81.9% at 600 W), almost granting it 80 Plus Bronze certification.

Voltage regulation from this unit is very tight, with all outputs within 3% from their nominal values (ATX12V specification allows a 5% tolerance – 10% for -12 V). And ripple and noise levels, although not as low as we’d like to see, were still below the maximum allowed.

This unit comes with a price tag of only USD 80 and if you live in the USA and buy it at you get a USD 25 mail-in rebate, making it to cost you only USD 55. Unbelievable!

The main competitor to OCZ ModXStream Pro 600 W is Cooler Master Silent Pro M 600 W, which we recently reviewed. Both achieved the same performance level, but the unit from Cooler Master has some advantages: more connectors, the cables from the modular cabling system are flat, lower noise and ripple levels, and we could pull up to 679 W from it – on this model from OCZ we couldn’t pass from the labeled 600 W. But it costs USD 100, making OCZ ModXStream Pro 600 W a bargain, being the power supply with one of the best cost/benefit ratios for the average user today.


Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil. He created Hardware Secrets in 1999 to expand his knowledge outside his home country.