Bit-Tech published a first look at Seasonic's M12D 850W power supply

We'll obviously hold off with our final yay or nay until we can stress test the bits off it to test how it copes with load, efficiency, PFC and noise levels in comparison to other PSUs. We did test it for a short while with a Core i7 system and two GeForce GTX 280 in SLI, the unit remained cool and very quiet, however even that high end PC won't seriously stretch an 850W PSU.

From the outside, it looks like Seasonic has done everything right - a variety of modular cable lengths with good connector choices and lower resistance, thicker cabling where it matters, a fantastic fan and 80Plus Silver certification. If we nit-pick, then the braiding isn't perfect and we'd like to have seen a second 4+4-pin EPS12V instead of just a 4-pin, but other than that we're finding it hard to give fault. I suppose it's a little unspectacular on the surface, but then it's no different from an Antec Signature or OCZ EliteXStream - it's what is inside that counts anyway.

We've no UK price yet, but apparently it's meant to retail nearer $300 which is a hefty sum to part with for even the most hardened Seasonic fanboy. That's not to say other premium PSUs like the Cooler Master Ultimate UCP 900W and Antec Signature 850W are that much less expensive - although whether you get appreciably $20-30 more for the Seasonic than the Antec for example, is difficult to ascertain and down to personal opinion.

First Look: Seasonic's M12D 850W power supply