I've got this PSU running with a radeon 4870 and an MA770T-UD3P. Found almost no reviews so was wondering if you guys had any ideas. Got it on sale. GPU seems to be heating up a fair bit more then normal at 77c while playing mw2.
The OCZ Z series are brand new power supplies that were introduced about two months ago. I did manage to find technical reviews of the 650 watt version. If the 550 watt version is anything like it's big brother, then performance will be more than adequate. The specifications for the power supply are what I would expect for a high quality psu. Competent technical reviews will be required before a valid opinion can be made.
There are two items I object to.
First, the data label is misleading. It indicates the power supply has four +12 volt rails rated at 18 amps each. The actual total current (amps) is based on the maximum wattage which is listed as 534 watts. When divided by 12 volts the total current is 44 amps. In all probablity those are not genuine separate rails. They are probably "virtual rails". It is an advertising gimmick. There was a big stink about it a few years ago. Psu's with true multiple rails were very high wattage units designed for use with overclocked high end systems with three or four video cards.
Second, the advertising claims the 550 watt power supply is dual gpu ready and Nvidia SLI certified. The 550 watt power supply would not be able to power an overclocked system with two high end, power hungry video cards operating in SLI mode. One card yes, but two cards no.
We'll just have to wait for the technical reviews.
rather shady specs. 12v * 18a * 4 is over 800w. 550w from (115v@6a) 690w input is only 79% efficiency with my math.
This should be ok with basic SLI and light OC'ing, i dont see it having Crossfire certification but should be ok with that too. An I7 rig at 3.3Ghz with dual 5870's only used 430W. Still I'd like a better 'cushion'.
popatim - There is a tendency for people to simply add the current (amps) listed for each +12 volt "virtual" rail. It doesn't work that way. Instead you use the maximum wattage for the +12 volt rail(s). For this power supply it is listed as 534 watts. It's right on the data label. Divide by 12 volts which works out to a total current of 44 amps.