I have at the moment a P5Q-WS P45 board with an overclocked Q6600 with a freezer pro, and 8gb of OCZ ram, running at about 910mhz.

I have been given a P5Q3 board which is basically a P45 lga775 board that takes DDR3 memory. So all I would have to buy is the ram...is there any advantage with Core 2 Quad in going to DDR3, all I can find so far is yes, but if you go 1600mhz and over as the lower stuff has crap timings or something like that...

Any opinion ? As the only cost would be the ram.

In benchmarks you'd see an improvement if you used 8GB of DDR3. However, I really don't think it's worth paying out for 8GB of DDR3 when the performance gain wouldn't be great at all. The only benefit (other than slightly improved benchmark results if you managed to get 8GB) would be an easier upgrade route to Core i7 or AMD AM3 as you would have plenty of DDR3 already that potentially, you could just move over.

More likely AM3 as you are probably better off buying the triple-channel kits for i7...
May be ok for i5 when it comes out though.

Thanks for the input, I'm not going to bother, as I'll be having to remove it, refit the cooler, etc etc, and don't want to blow loads of cash of 8gb of ddr3 right now. I will prob just put the board in my sons PC when the 4gb kits go down in price, he has an oldish ip-35 right now.