be quiet! and OCZ Power Supplies are not identical Power Supplies. There are manufacturing variances between both of them. Both power supply brands are developed and designed by different and independent product managers and engineers.

By taking a first look to ATX Power Supplies, all ATX Power Supplies Manufacturer have to meet the Standards and especially Power Supply Design Guides, which describes the necessary measurements and technical requirements. i.e. be quiet! STRAIGHT POWER items are manufactured in accordance to ATX 12V 2.2 and EPS 12V 2.91 standard and it uses 4 separate 12V cables for an optimal power supply and stable operations.

By taking a closer look you will find some differences within the non-visible components like, PCB, heat sink and partly other build-in components and by choosing the most silent fan for active Power Supplies. The results will be indicated by performance tests.

Each power supply manufacturer is trying to improve the quality and performance of its own power supply brand. Be quiet! is using own designed PCB, own designed heat sink, partly other build-in components as well as most silent fan for being as quiet as possible.

Be quiet! should be as silent as possible, otherwise it does not make sense to call your brand like this. We are focussed on energy-saving design by offering high efficiency of up to 83% within the STRAIGHT POWER Series in accordance to the new RoHS and WEEE Directives. (en.wikipedia.org/wiki/Restriction_of_Hazardous_Substances_Directive or en.wikipedia.org/wiki/WEEE)