Right now OCZ has the advantage of being the only manufacturer with high-wattage 80 Plus Gold-certified power supplies on the market. If you have a lot of money and are looking for a high-end 1,000 W power supply, Z Series 1000 W may be an option. This is definitely not a product for users with tight budgets, though.

Internally we discovered that Z Series 1000 W is based on the same project as the 850 W version but with one additional active PFC transistor and upgraded rectifying bridges.

We saw efficiency between 87.8% and 89.6% when we pulled up to 800 W from it. But at 1000 W efficiency dropped to 84.3%, but this may also be caused by the different load pattern we had to use to overcome the limitation in our load tester (see our full test results for a better explanation).

At 1000 W we also saw noise level a little bit above the maximum allowed at -12 V and the +3.3 V output at only 3.06 V (while the minimum allowed is 3.135 V). Unfortunately these two flaws prevent us from recommending this unit. Carrying a heavy price tag (USD 260 – USD 290), we expected to see a flawless product, even though we know that almost no user will pull anywhere near 1000 W and thus these flaws won’t be apparent.

Updated on March 12, 2010: OCZ has just dropped the price of this power supply to USD 244 at (USD 214 after a mail-in rebate), which is also offering free shipping now. This improved a lot the cost/benefit ratio of this product.

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.