I've upgraded at least 3 MP4,1 to have 12 cores. I now need to upgrade one or two MP5,1s to 12 cores with highest GHz processors. Do the 5,1's have lidded processor or do they simply latch down without the integrated lids ? I did a brief search here for MP5,1 upgrades but found nothing. If you know of a thread or two covering MP5,1 processor and RAM upgrades could you please post back links. Thanks very much.