Hi everyone, Sorry if I'm making a new thread, I haven't had luck finding what I need. So I have a 2010 MBP and honestly it's old now.. dual core cpu, nvidia 330m with 256Mb dedicated.... So for my next computer, I want a desktop that I can upgrade the s*** out of it, and well the iMac fails, so I guess it's the Mac Pro. And now apple is selling refurb Mac Pros and I really want one. I have learnt enough about the PCI slots thanks to this forum, so no questions there. About the CPU, I have some doubts. I know the 2009 quad core has the cpu with IHS and the dual cpu doesn't! However I need to know if this applies to the 2012 model as well. This guy says the 2010 and 2012, single and dual processors have the IHS, while everymac.com says it's the same as 2009 model. So I'm now really confused. I would really like some insight in this. Also do you think it's worth the 1100$ to pay extra to get the 12 core instead of the quad core? SP Option: 2,139$ One 3.2GHz Quad-Core Intel Xeon processor 8MB Cache 6GB (3 x 2GB) of 1066MHz DDR3 ECC memory 1TB Serial ATA 7200 rpm 18x SuperDrive (DVD±R DL/DVD±RW/CD-RW) ATI Radeon HD 5770 with 1GB GDDR5 memory DP Option: 3,239$ Two 2.4GHz 6-Core Intel Xeon processors 12MB cache 12GB (6 x 2GB) of 1333MHz DDR3 ECC memory * Same as above Is 2.4 slow? I will be running a lot of CFD and CAD/CAM on this machine, and I want sth that I wont have to upgrade for at least 5 years. Thank you so much!