Mixed memory sizes in dual channel slots

[HeneryH]

I have a question about dual channel memory configuration and adding mixed modules.

I have 8gb x 2 in A2 and B2 now.

I want to add more memory and was wondering if, to allow flexibility in the future, if this was allowed...



I think the manual is telling me that if I use the above config then the first 16 (8+8) in channel A and the first 16 (one of the 16s) would be in dual channel access mode while the remaining 16 would be in single channel mode.

If that is the case, could I take a baby step and just use one 16?



Thanks

[haihane]

If that is the case, could I take a baby step and just use one 16?

then you'll lose dual channel memory. this will take a hit on memory performance.



i'm afraid i can't answer the rest of the questions.
meee avoid mixing ram sticks of differing sizes. it should still work if all you're concerned is total ram size detected.

general rule of thumb i heard was, it will run at speeds depending on your lowest stick speed.

so if you have 4 sticks:
- 2 sticks 8 GB, at maybe 2133 MHz, maybe CL 12 ?
- 1 stick 16 GB, godlike 4000 MHz CL 16,

end result: 32 GB at 2133 MHz, CL... uhh... out of my area of knowledge. if i were me, i'd be glad if it boots up and passes all mem86 tests.
aida64 memory benchmark might take a beating tho.

[HeneryH]

They'll all be the same brand and timing specs, just different sizes.

The MoBo manual says this

You may install varying memory sizes in Channel A, and Channel B. The system maps the total size of the lower-sized channel for the dual-channel configuration. Any excess memory from the higher-sized channel is then mapped for single-channel operation.

but I am not 100% sure of my interpretation of the statement.

Now that I read it again, I think this config should allow all 32 in dual channel mode:

• Ch A1 = 8
• Ch A2 = 16
• Ch B1 = 8
• Ch B2 = 16

For some reason at first I thought this was preferred but now I doubt it:

• Ch A1 = 8
• Ch A2 = 8
• Ch B1 = 16
• Ch B2 = 16

To make a half step towards the end goal and save $80 in the short term, do you thinkg this would be OK?
For some reason at first I thought this was preferred but now I doubt it:

• Ch A1 = 8
• Ch A2 = 8
• Ch B1 = 16
• Ch B2 = vacant

[haihane]

umm, A2 B2, 8 gig sticks, perhaps?
to enable dual channel memory (hopefully)

single stick, stick then wherever else is left.