Hi people. I have an oldish A2 that I have been repairing, It had a 2.6ghz celery desktop cpu that was running very very hot that I have replaced with a 1.8 p4,from a retired beast, this has definately solved the heat problem (as well as removing half an inch of dust) and I would say that performance is around the same. The questions I have for you all are these, 1. the max cpu speed for this machine is 2.8ghz, now there are a few of these chips floating around on ebay but there are far more chips clocked @ 3ghz, if I was to use one of these would the MB simply downclock the chip or would I fry the MB? also would the heat issue return? 2. Regarding RAM, the machine curretly has 512mb of DDR SDRAM, not enough in 2007, the new memory I am looking at buying is DDRII 667, Will this make a difference or do I need to stick with DDR? many thanks in advance.