Just installed my new X-750. Fan has yet to come on so can't comment on that, but during install, I did have a few gripes.
1st) Why the %#^& are the connectors for the motherboard cable backwards from what the conectors on the psu are. The psu has the shorter cable on top, and the longer on bottom, and the cable itself has the longer one on top and the short on bottom meaning I had to twist them around each other to get it to plug in.
2nd) SATA cables are backwards too. I had to twist each sata connector upside down from what it actually is in order to get them onto my HDD's. Perhaps this is because the unit was designed to be top mounted instead of bottom? Idk.
3st) Not full tower friendly. I couldn't route my cpu cable behind my MB tray in my HAF-X. Not really a fault of the psu since my case is obscenely large, but just a few more inches on a few key cables would have been splendid. This is actually not that big of a deal, since I'm moving to an ITX build with it soon, but for my current case, it was a bit of a stretch getting some cables connected. Luckily the cpu cable fit perfectly between my 7970's pci bracket and the MB and up behind my H70 so it's still hidden pretty well.
Few minor gripes. Apart from alot of cable twisting and a few shortcomings, this PSU was still monumentally easier to install and cleaner inside the case than Medusa (my 850w Coolermaster PSU that came out of it) and i'm extremely satisfied. The unit itself has a really nice feel to it, look's awesome, and so far hasn't even turned it's fan on so it's 100% silent, which is awesome. Can't hear a single thing coming from my case and my house is dead silent right now. Shweetness. Oh and I also would have liked the Seasonic Logo to be on the opposite side. I'd much prefer to see that instead of the unit's spec's =\.Edited by Shiveron - 7/19/12 at 5:17pm