107 cant burn above 6x

I have a Pioneer 107 which used to burn at 8x (this is with Ritek G05s and Fujifilm 03s) and now coasters at the point where the drive switches to 8x. DMA is enabled, I just upgrade to an Athlon 64 3500 so I know its not my PC. Any ideas?

Oh yeah Im running V1.20 FW with riplock and RPC1.

Thanks