Re: Motherboard RAM compatability ???
Something else you have to consider is that the composite score in Windows is not the be-all, end-all for memory performance. The higher ratings are reserved for things like the Intel i7 systems with triple channel memory, or the guys who run dual channels at extreme speeds or latencies. It's useless to hunt and peck just to raise your Windows score on this metric.
DDR2 isn't a bad spec to be on right now. DDR3 is faster, but it's also higher latency. They're pretty much 5-10% faster than DDR2, so don't worry about it.
DDR2-8500 is PC2-1066, which offers just marginal, if any, performance improvement over DDR2-800 (PC2-6400), which is what you have now. Don't worry about it until you upgrade your system to a DDR3 platform. I wouldn't upgrade the system just to get DDR3, but if you have that kind of money to blow, send some my way, eh?