Right I've just had yet another BSOD on my system and again Windows is pointing towards 'X64_0x124_AuthenticAMD_PROCESSOR_CACHE' as before. Is it still likely to be software related or is it possible it's a hardware fault? I have memory dumps, minidumps and sysdata.xml available if it helps. If I check myself with Windows debugging tools I get 'Probably caused by : hardware'.