Best RAM Configuration for Mac Pro 5,1 Dually?

[Buzz]

What's the best way to divvy up RAM between the two banks in a 2010 Mac Pro 5,1 DP?

Glut of RAM available is:

5 X 8GB
3 X 4GB
3 X 2GB

Obviously, highest count is to use all the 8's & 4's, but what is optimal structure?

8+8+8+8/8+4+4+4, or...
8+8+8+4/8+8+4+4, or...
8+8+4+8/8+8+4+4, or something else?

To have totally matching banks, we'd lose an 8 and a 4, and gain two 2's...

8+8+4+2/8+8+4+2, which is 44GB instead of 52GB, but then everything matches between the banks.

So what's the real best practice?
(while I have to keep futzing w/ the other (single proc) tower's phantom RAM slot issues)
Thanks.
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[AllGold]

You get a slight boost in speed from populating 3 slots instead of 4 on each CPU, although I doubt the difference is really noticeable. But based on that, I would say dump all the 4GB and 2GB sticks and get one more 8GB for 3 X 8GB times two.

[MrNoBody]

As long as 16GB sticks aren't involved, the 52GB should be OK if all of them are
1333MHz DDR3 PC3-10600 ECC Memory.
I'm running 32GB (4x8GB), two sticks marked Micron & two marked H-P; all
server pulls but with the same ratings. (Single Xeon 6-core)

[STL]

Check out pg 58 & 59 of the Mac Pro manual at the link below
https://manuals.info.apple.com/MANUALS/1...010_ug.pdf

[Buzz]

STL wrote:
Check out pg 58 & 59 of the Mac Pro manual at the link below
https://manuals.info.apple.com/MANUALS/1...010_ug.pdf

Thanks for that, the box, and any printed material that came w/ the tower, have been in our storage locker for quite awhile. It seems to say, use 8+8+8+8/8+4+4+4, to start with, then let the Memory Slot Utility possibly recommend a better configuration. Does that then mean there really isn't a best practice that can be gleaned from real world usage? I was hoping the MRF smarties would know. It's a bit tougher to diddle w/ RAM in the dually, than in the singlet, hence the hope.
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