I have built many computers around the K7S5A. This is not an opinoin either, it is real. I do not have an exact number, as some were upgrades, some were whole computers and I am not going to check. I never once got a dead board. I never once had a single problem that I traced to the ECS k7s5a mainboard.
I even built a system baised on the K7S5A in a briefcase. That computer was powered by the power supply in the Genica case that CompGeeks sells
Here In addition to that, I built one more computer in that case with that power supply as well. I also have a Deer 250 watt PWS on the computer I am typing on now ( but that is only powering the mainboard, I have a nother power supply that powers the hard drives and fans, and that is the kk266 from Iwill )
I have only built one computer with the other chipset from SiS ( SiS 705 I think. The one with only PC 133 support, with video on board, also from ECS )
I have heard horror stories about this board, most of them posted here in the tech help section. It does seem that the board does not like some power supplies, and that sometimes you may need a PCI video card for the first boot up ( think they have that solved now, and I never needed it )
Also, I have not updated the Bios on any of the boards. Only one of them is overclocking for me, and that is a duron 600@800 ( 133 bus ) That computer actually has a 200 watt power supply from TigerDirect that I got for $4. Keep in mind that all these computers that are on 200 and 250 watt pws's only have the bare minimums installed. The duron 600@800 only has the board, video hard drive and floppy. That is my web server.
If you need or want more info, please PM me.