0A STOP errors...are pretty generic, see 0A in left column at http://aumha.org/a/stop.htm
So, the error message itself doesn't really point fingers.
The 4E errror...just a tad less ambiguous...I see why you might think it's a RAM issue, but I don't think that.
Simple next step...download, burn to CD Memtest86+ from http://www.memtest.org/#downiso
. You want the latest version 4.10. Both option are compressed .iso files, either of which should be able to be opened by any utility which reads compressed file formats.
Once you see the .iso file, burn that to CD.
How to write a CD-DVD image or ISO - http://www.bleepingcomputer.com/tutorials/write-a-cd-dvd-image-or-iso/
The result will be a bootable CD from which the RAM diagnostics can be run.
A decent guide for technique: Icrontic » Diagnose with Memtest86+ - http://icrontic.com/articles/diagnose_with_memtest86
My experience is that it takes about 2-2.5 hours for Memtest 86+ to run a whole series to completion. That's the time that you should allocate for this.
Any error...is as good as 100 errors, indicating a problem. The problem could be the modules...the motherboard slot...the CPU clock, etc...don't just assume that it's the modules.
Edited by hamluis, 17 June 2010 - 11:27 AM.