specification : "thermaltake toughpower qfan 850 watt active pfc cable management extremely quiet 140mm ball-bearing fan decreases 17% noise level stable 850w continuous output (at 50°c operating environment) complies with atx 12v 2.2 & eps 12v 2.91 version three independent & dedicated +12v rails (12v1,12v2,12v3 ) provide stable and superior performance for pc system (combined loading of 52a). support dual core cpu, quad core cpu, nvidia sli and ati crossfire multi-gpu technologies modularised cable management to eliminate clutter and improve airflow inside the case independent voltage circuit: offers unflappable current delivery under heavy load strict voltage regulation (±3%): provides steady voltage for system active power factor correction (pf>0.99) and high efficiency (up to 85%) japanese made capacitors green power design that meets energy star, blue angel requirements protections: over current, over voltage, and short-circuit protection safety / emi approvals: ce, cb, tuv, fcc, ul, cul, and bsmi certified. model ttw0204"