Asus m3n78-EM Issues

This is a bit of a duplicate post since I also put it in power supplies, but I honestly need all the help I can get

Having a lot of strange issues with my asus m3n78-EM, and trying to sort it all out. I've been suspecting the board because many of my problems are things other buyers reported as well on newegg.

One thing that threw a red flag is the +12v rail is showing +12.18 - +12.26 in the bios.

Is this enough to be causing some trouble? And moreover, is it excessive enough that it could be damaging hardware?

The numerous issues I've been having include: Failure to POST from cold boot (CMOS reset needed in some cases), overheating and gradual lack of performance of the iGPU (eve online ran premium at just over 30 fps at first install, now premium is unplayable and classic can drop as low as 5 fps at times), slow load times for most anything (my old 1gb of ram Athlon 2700+ machine loads winxp in 1/3 the time), and a slight overvoltage of the processor, hovering between 1.44 - 1.48v

Bios has been updated to newest revision, didn't help at all

So, any ideas folks? I just started building computers again after a bit of a break, and first I come back to find abit is no longer worth buying, and seemingly no longer even in the business.. And now I'm having even more troubles with this asus board. Clearly in over my head as too much has changed =/ . For all I know i've done something wrong along the way in connecting my PSU to the motherboard.

Thx.

PSU:
Rosewill 500W Max.
+3.3V@24A, +5V@20A, +12V1@19A, +12V2@18A,
-12V@0.5A, +5VSB@2.5A

Full Specs:
MB ASUS M3N78-EM AM2+ GF8300
CPU AMD|A64 X2 6000+ 3.1G AM2 1M
MEM 2Gx2|CORS TWIN2X4096-6400C5
HD 250G|ST 7K 8M SATA2 ST3250310AS
DVD BURN LITE-ON|DH-20A4P-04 20X

I'm honing in on the power supply. Which would be fairly likely for you as well given that your problems started after adding a video card.

I've been talking with asus and their latest motherboards have significantly higher demands than previous. Even the micro atx boards are still demanding just as much as their larger cousins. Check the amperage demands for your specific board and see if your PSU exceeds them. It's possible that video card pushed your PSU over its limit.

i have a m3n78-em also,I am having FPS issues with the 9800 and the 8800, i initially thought it was the 8800 GFX card so got the 9800, same problem playing Americas army, start with good fps then after a while gets real erratic, and if i start it up after couple of hours of pc being on standby well there is no hope of playing, i have replaced everything,psu, ram ,cpu and i can only put it down to board.

I have a asus M3N78 motherboard and the manual said I could that even though I had a 64 bit version cpu which is a AMD Athlon X2 Dual Core 60000+ 64 bit, I could still install my 32 bit windows Xp but upon doing so cmos stuffed up and I then relised that the manual is wrong. So if any one has a cmos problem check the bit verson of the software installed.