My i5 8GB is in its box awaiting UPS. I think the M3 will last until the next refresh. I just have this feeling that the i5 in the SP4 chassis is like a racehorse with three legs. Hobbled. A 3 legged racehorse will go faster than a normal horse but it makes too much noise in the process and just doesn't feel as fast as it should in comparison to the M3 considering the extra cash.