Thanks Praz, I was holding off on using Intel RST drivers until after my 980x review is complete as didn't want to rock the boat, but I just bought a 2nd hand HD5970 so want to test it out, so cloned to the crucial ssd so can update drivers to cat 10.4x without touching my review config.

Steve pcmark vantage hdd suite numbers were

intel 80gb x25-m g2 = 29k
ocz 120 vertex 1.5 firmware = 24-25k
crucial 256gb g01 = 37.6k