http://www.amazon.co.uk/Tyan-Tomcat-h1000S-S3950G2NR-Mo... mobo takes DDR2 and as was written, this mobo is a tad to large but can be installed, with fewer screws to get it in.
Saying that you're going to end up paying more than what the build is worth at present. their is not problems with compatibility, if you continue to go ahead with your build.
But it wont be compatible with the AM3 or AM3+ cpu's, again not worth the investment