Good News Hi All The seller has offered to replace the dodgy CPU. He says he will post it tomorrow so at least I don`t have to wait for 2 way international post . The RAM works perfectly, with all settings on "auto" it runs at 1333MHz 9,9,9,24,1 at 1.5v, this is normal for Sandy Bridge systems. With "DDR speed" set to "Force DDR3 1600" it rebooted with the memory at 1600MHz 9,9,9,24,1 at 1.5v . This is very good news because getting the memory up to speed was a major concern. I have started work on the case and will build the system up with one CPU while I wait for the replacement to arrive. To be continued.