Hi,

Just wanted to make you aware that the OCZ Powerstreams 420W/520W are not ATX12V 2.0 (this is different to ATX 2.0 which gets quoted alot) but ATX12V 1.3 compliant as confirmed by OCZ Tech Support:

The PowerStream 600W is ATX12V 2.01 compliant, while the 520W and 420W models are ATX12V 1.3 compliant, as we mention on the PowerStream product page.

Sincerely,
Technical Support Specialist
Quote Originally Posted by Antec's Website

What is ATX12V v2.0?

This is the latest “desktop” motherboard and power supply specification released, a significant update to v1.3. Some notable changes have occurred:
• SATA power connectors are ‘official.’
• The mainboard power connector has changed from 20 pins to 24 pins to better handle loads on the PCI Express bus.
• The 6 pin Aux Power connector has been dropped.
• Circuitry has been upgraded to dual +12V outputs to maintain greater stability to the CPU and peripherals. In addition, overall +12V output has been increased to compensate for PCI Express expansion cards.
• A minimum efficiency of 60% under light load is now required. This is a significant improvement.
At this time it is undetermined if these PSUs are actually BTX compliant as a spec for BTX PSUs has not been ratified tho it is expected to be based on the ATX12V 2.0 spec:

http://www.antec.com/pdf/article/ATX12v2.html

They are obviously still quality PSUs but there has been recent confusion with regards to what type of PSU is required for PCI-Express and SATA. Also I am unsure how 'future-proofed' these PSUs are if BTX is incorporated as an industy standard.

If this matters to you its best to check if your PSU is ATX12V 2.0+ specification rather than ATX 2.0.

ps3ud0