I'd be interested in this too, though I'm currently dubious about the Neo 4 Plat's overclocking abilities.
I'm running the system in my sig, and the X2 3800+ doesn't want to boot if run at more than 3% above stock speeds. I suppose my power supply config could be funky (it's only a 20-pin, it's still a dual-rail high quality unit though and fully stable at stock), I have high-quality RAM, so I don't think that's the problem either, and I've only got one vid card. Latest BIOS. When I ran a Winchester 3000+ I could get up to a 240FSB on lesser quality RAM than I currently have (shrug), but now that I think about it, that might have been on my Neo2 Platinum board. I suppose it could be the chip I have, too. My system is air-cooled, but well done (3x 120mm fans, Swiftech high-end HSF for the CPU).
I've decided I'm okay with stock speeds for now, unless someone has some really good advice. System does everything I really want.
Intel Q9450 @3.2GHz, Gigabyte GA EP45-UD3P, 4 x 2GB G.Skill @4-4-4-12
Antec P160SW case (modded), Xigmatek 750w PSU
3x 500GB (RAID-5), , OptiArc 7200S, ASUS E818A3T
Creative X-Fi XtremeGamer, Hauppauge HVR-1800, Radeon 4890