terroristone,
I just set up a RAID 0 Array on my board using 2x Raptor 36GB (16mb) drives and used 128mb (default) cluster size. From all the reading I've done the cluster size really depends on what you will use your computer for, there will be benefits in certain applications but in others there will be trade-offs so my opinion has always been to stick with the default size. By the way the performance increase from from my old 680i is quite impressive (as far as read/write and burst goes)! This ICH9R is very nice compared to the Nvidia 570MCP!

dMITIj,
Interesting results, so you took the card you had been having the problem with (when installed in your DFI P35) and installed it into a friends motherboard (680i) and had no problems? But when you installed that same card again into your new Gigibyte motherboard the same problem arose (despite a different PSU)? Those results are not very promising to say the least. Have you happened to try a different graphics card into either your older DFI UT P35 or into your new Gigibyte board and if so what happened? I ask because like I said above my new replacment will be here Monday and now I'm worried it will be no different? If I continue to have the same problem despite a brand new graphics card than I'll probably just have to get another new motherboard (even though I'm really starting to like this one)! I'm going to try a few more things tonight and I'll keep you posted, please do the same with any new resutls you have?