K4mui - you may well be right as I had expected better.
But further tests have indicated that this may not be a ram problem
Memory 133 in bios, Vcore 1.7v, memory 2.8v, Ht 3x - Max speed before immediate lockup 245 x 10. Didn't even try running Prime 95
Basically I think I have hit my CPU limit as 230 x 10 is totally stable at stock voltages.
But further tests have indicated that this may not be a ram problem
Memory 133 in bios, Vcore 1.7v, memory 2.8v, Ht 3x - Max speed before immediate lockup 245 x 10. Didn't even try running Prime 95
Basically I think I have hit my CPU limit as 230 x 10 is totally stable at stock voltages.