Mid 2010 Mac Pro Ram Question

mrt209

macrumors 6502
Original poster
Nov 21, 2010
418
33
USA/Germany
Hi,

I currently have 3*4G 1333MHz DD3 ECC ram in my mac pro. I wanted to purchase 4gb more to fill the last slot and didn't notice the ram I purchased was non-ECC. Is it bad to mix ECC & non-ECC? If yes, were can I find 1333MHz DD3 ECC SDRAM (can't find it anywhere).

Thanks
 

flowrider

macrumors 603
Nov 23, 2012
6,139
2,331
To the OP, you do realize your CPUs utilize three RAM channels, right? Slots 3 and 4 run in parallel as the third channel. Optimum RAM performance is obtained when utilizing slots 1,2 and 3 with equally speced RAM and leaving slot 4 MT.

Lou
 

mrt209

macrumors 6502
Original poster
Nov 21, 2010
418
33
USA/Germany
To the OP, you do realize your CPUs utilize three RAM channels, right? Slots 3 and 4 run in parallel as the third channel. Optimum RAM performance is obtained when utilizing slots 1,2 and 3 with equally speced RAM and leaving slot 4 MT.

Lou
Sorta that's why I initially purchased 12gb of ram, but I was under the impression it was because at the time the extra cost of filling the fourth slot wasn't worth it in terms of performance. With prices down these days I thought it may be worth it.
 

mrt209

macrumors 6502
Original poster
Nov 21, 2010
418
33
USA/Germany
You can mix them. I'd try that few times already. However, that will make you lost the ECC function.
Thanks everyone for the input, took out the non-ECC memory. Ran a check on the other three and they still work fine... as you can tell I know very little to nothing about comp hardware.
 
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