Memory – CORSAIR Vengeance LP 32GB (4 x 8GB) 240-Pin DDR3 SDRAM DDR3 1866 Desktop Memory
Since we can’t get registered memory modules on our ASUS Extreme IV Gene motherboard, we can at least do the next best thing, which is to purchase a kit that is pre-tested. This 32GB CORSAIR DDR3 memory kit runs at the same speed as the memory modules in the Mac Pro. They are also low profile which means that if you wanted to run an air cooler instead of the water cooler we recommended, you could do that with fewer clearance issues.
Unfortunately, because no one seems to be selling a non-registered 16GB single DDR3 module right now, we won’t be able to get the same 64GBs of memory as in our top spec Mac Pro. But we can buy 32GBs of this stuff for only $359.99 US. However, a choice to run with a full sized workstation board and larger case would allow us to use ECC modules and get to the same memory density. For reference, a single 16GB 1866MHz ECC memory module from Kingston would run you about $200 US. So multiply by four to get your 64GBs.