The Zalman ZM850-HP PSU is currently the largest PSU from Zalman. While it promises to be quiet, it is a bit weak for today's high-end systems and seems to struggle a bit when forced to run a fairly heavy load. That being said, it was always within its rated specifications, but we saw fairly large variability at higher loads. If the trend continued up to 800W+, we could expect to see some rails out of spec.



Link: BCC Hardware