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I am interested in installing 64Gb RAM in a mid-2010 12-core MacPro. Crucial does not offer any 64Gb kits, but they do offer a 2x8Gb kit:

http://www.crucial.com/eu/store/mpartspecs.aspx?mtbpoid=60826169A5CA7304

Is it technically possible to install four of these kits in a MacPro? Or is there a reason that they don't sell a 64Gb kit? The specs of the RAM are 'DDR3 PC3-10600 • CL=9 • Dual Ranked • Registered • ECC • DDR3-1333 • 1.5V • 1024Meg x 72'

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Well, the page says that it has 8x RAM slots, so you should be able to populate each slot with an 8GB stick, taking you up to 64GB. It's not cheap though...ouch. – tombull89 Nov 15 '11 at 15:57
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"Or is there a reason that they don't sell a 64Gb kit?" - There isn't a huge demand for it would be my guess. – Ramhound Nov 15 '11 at 16:09
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Gotta love Apple - $400US for something that costs <$250 in the PC world, and last I heard the only difference in the product at all is the byte order (endian-ness) – Joel Coehoorn Nov 15 '11 at 16:25
@JoelCoehoorn - When you compare the pricing for the "Apple-specific" version of the RAM module to the non-specific "value RAM"-style equivalents from a manufacturer like Kingston memory, the pricing is <$20 more per stick for the "Apple" sticks. This is the same deal as when buying other OEM-specific RAM modules (like Dell or HP). The difference is the modules that are marked specifically have had their design specifically tested and blessed by the OEMs. This costs the RAM manufacturers extra to do, so they pass it on. – techie007 Nov 15 '11 at 17:05
@techie this is hardly "value ram": newegg.com/Product/Product.aspx?Item=N82E16820231489 – Joel Coehoorn Nov 15 '11 at 17:46
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Wikipedia says:

Expandable to 32 GB on Quad-core models, and 64 GB in 8- and 12-core models (although expandable to 96GB using 3rd party 6x16GB DIMMS)

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Interesting - why not expandable to 8x16Gb with 3rd party DIMMS since there are 8 slots? This is the reason I wanted to check if I can actually fill all 8 slots with 8Gb DIMMS. – astrofrog Nov 15 '11 at 16:20
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@astrofrog - Probably the board doesn't support it. (I have no idea what the innards of these things are - maybe the chipset doesn't, either. That's doubtful, though.) – Shinrai Nov 15 '11 at 16:28
BIOS/chipset has to support it as well, you can't go back to an older PC motherboad that has four slots, stick 16GB in and work with 64GB of RAM either. – kbyrd Nov 15 '11 at 16:47
@kbyrd - but so the MacPro can definitely take 8x8Gb? – astrofrog Nov 16 '11 at 9:30
@astrofrog: Yes, that's how I read that bit from Wikipedia. – kbyrd Nov 19 '11 at 14:25
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