Your system needs: 240-pin PC3-10600E (1066 MHz) DDR3 ECC SDRAM. Here's a good source and they offer a nice table to help you figure out the different setups: As it turns out you can boost it to a max of 48 GB! (3rd party tested). Frankly, I think you'll find 16 GB is good for most heavy gamers, picture editing and video editors if that is your usage. Otherwise 10 to 12 GB will meet most peoples needs. As to mixing your old and new RAM just keep an eye on the banks, you don't want to mix modules within a bank.

Dec 7, 2017 - The 2010-2012 Mac Pro years saw the best that Apple has ever offered. Us all about how much RAM you can put in the 2010-2012 machines.

Frankly, I don't like to mix and as you only have four sockets you might as well replace all of your RAM modules going with four - 4GB Modules (16GB total) that way you get the best performance of the dual channel and interleaving.

I have a MacPro5,1 with 8 cores (2 quad-core processors) running OS X 10.10.2. How to make white sauce for mac and cheese. From what I have read as per it should be possible to have far beyond the normal maximum noted by Apple: Actual Maximum RAM. Systems with dual processors, which EveryMac.com notes as the 'Eight Core' and 'Twelve Core' models, likewise officially support 32 GB of RAM, but again, OWC found they actually can support more. OWC first confirmed an actual maximum of 64 GB of RAM running Mac OS X 10.5 'Leopard' and later increased this maximum to 96 GB of RAM running Mac OS X 10.6 'Snow Leopard' or higher.

More recently, OWC yet again discovered these dual processor models can support up to 128 GB, but only when running a 64-bit version of Windows XP or later or Linux. Mac OS X only can support 96 GB of RAM. I initially had an arrangement of 8 4GB DIMMs. These brought my system up to 32GB. I then purchased 2 16GB chips in hopes to raise the amount of RAM, however my system would simply not start up at all. Gave a fast power LED blink.

I subsequently returned this RAM and acquired 4 8GB DIMMs. Upon installing these, my system still shows 32GB of RAM, but the 7 & 8 DIMM slots are showing empty now at this point. Two of the DIMMS are being recognized while the others are not, even though there are 4 GB DIMMs in place and 4 4GB DIMMS: What kind of issue is going on here? Obviously we're getting mixed messages with the info above about being able to accept much larger memory configurations, but in practice things get quite whacky. That machine will take 16's - my 3,1 does, to an unofficial maximum of 64GB [or more, according to Everymac, though I've not tested that myself]. The arrangement is not what you would initially think logical.

On the Mac, instead of hitting a “Print Screen” button, you’ll hit one of several keyboard combination shortcuts to perform a specific action, depending on the exact screen capture action you want taken. This is both easier and much more powerful, given that there are ultimately six unique options to.

• If you install equal-size DIMMs (for example, all 1 or 2 GB DIMMs) in your Mac Pro, Apple recommends that you fill the slots in the order listed in the table. Note: If you install different-size DIMMs in your Mac Pro, follow the order in the table.