I'm looking around to upgrade the cpu in my laptop and i'm trying to decide between X7900 or X9000. both cpus are 2.80Ghz with 800 fsb speeds. the only difference between the two is L2 is 4M for X7900 and 6M for X9000. the mobo takes Socket P 478 pin cpu and specs on gateway says it supports Intel Merom cpus, which is the family the X7900 is in. Does it matter what family cpu comes from and if not, which should i upgrade to? I'm upgrading from T7250 2.00Ghz cpu.