Forum Thread

Windows 10 x64 limiting 24GB of RAM to 16GB?

KO3bIPb 3,107 1,338 December 4, 2015 at 08:57 PM
I have this mobo: EVGA 132-BL-E758-RX
Had Win7 x64 installed with 12GB of RAM, 3x 4GB sticks populating 3 out of 6 slots.
Noticed newer games eat up RAM to the max, so decided to go Win10 x64 since it has 128GB limit for Home edition. Done and done, installed 3 more 4GB sticks, windowsupdated to Win10.

PROBLEM:
Win10 x64 reports that it sees 24GB of RAM, but says 16GB is usable.

TRIED:
1. Played musical chairs with diff slots/sticks, all check out good, but no change.
2. msconfig - Max memory trick - on OK\restart forgets 24GB was entered, sets 0.
3. Pounding on keyboard - replaced keyboard. Did not help.

Ideas?

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#3
Quote from KO3bIPb View Post :
I have this mobo: EVGA 132-BL-E758-RX
Had Win7 x64 installed with 12GB of RAM, 3x 4GB sticks populating 3 out of 6 slots.
Noticed newer games eat up RAM to the max, so decided to go Win10 x64 since it has 128GB limit for Home edition. Done and done, installed 3 more 4GB sticks, windowsupdated to Win10.

PROBLEM:
Win10 x64 reports that it sees 24GB of RAM, but says 16GB is usable.

TRIED:
1. Played musical chairs with diff slots/sticks, all check out good, but no change.
2. msconfig - Max memory trick - on OK\restart forgets 24GB was entered, sets 0.
3. Pounding on keyboard - replaced keyboard. Did not help.

Ideas?
Does your motherboard have onboard graphics? You might have to disable it(I'm assuming you don't use it)...Windows might be reserving ram for it.
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#4
Quote from xxxHolic View Post :
Win10 uses 8GB RAM to spy on you.
There is no such thing as a coincidence in this world. There is only the inevitable.
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#5
Quote from Ero View Post :
Does your motherboard have onboard graphics? You might have to disable it(I'm assuming you don't use it)...Windows might be reserving ram for it.
No on-board.
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#6
if has XMP profiles in BIOS, turn it off? or turn it on, but lower RAM speed? 1333 to 1066 something like that
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#7
Quote from Left4Deal View Post :
if has XMP profiles in BIOS, turn it off? or turn it on, but lower RAM speed? 1333 to 1066 something like that
why... Any way, xmp isn't on.
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#8
what CPU are you using? (edit: actually, I don't think this is the issue - sometimes the CPU has a limit on the max memory it supports, but the LGA1366 is a high-end platform and I don't see any CPU's that wouldn't support 24gb in that family..)

Have you tried booting with only 4gb (i.e. each slot individually), and also testing each stick by booting with each stick one at a time?
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Last edited by slapshot136 December 5, 2015 at 03:11 PM

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#9
Ok I think it has to do with dual and single rank Dimms each dual rank DIMM is actually seen as 2 chips which is interleaved with 6 chips interleaved it makes 12 actual or virtual chips depending on how you want to look at it, if you use 4 chips is dual config you get 16 that is probably the most the motherboard can support. Did you update the chipset driver

https://www.evga.com/support/download/
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#10
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#11
Quote from slapshot136 View Post :
what CPU are you using? (edit: actually, I don't think this is the issue - sometimes the CPU has a limit on the max memory it supports, but the LGA1366 is a high-end platform and I don't see any CPU's that wouldn't support 24gb in that family..)

Have you tried booting with only 4gb (i.e. each slot individually), and also testing each stick by booting with each stick one at a time?
Interestingly, my i7 960 [intel.com] seems to be limited to 24GB of RAM! Whould've never guessed, thank you!

Similar problem, no solution...
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Last edited by KO3bIPb December 6, 2015 at 12:37 PM
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#12
Quote from komondor View Post :
Ok I think it has to do with dual and single rank Dimms each dual rank DIMM is actually seen as 2 chips which is interleaved with 6 chips interleaved it makes 12 actual or virtual chips depending on how you want to look at it, if you use 4 chips is dual config you get 16 that is probably the most the motherboard can support. Did you update the chipset driver

https://www.evga.com/support/download/
Thank you! I am ashamed I didn't think of that, now it shows 20GB out of 24 available. Sigh...
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Last edited by KO3bIPb December 6, 2015 at 12:50 PM
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#13
Quote from KO3bIPb View Post :
Thank you! I am ashamed I didn't think of that, now it shows 20GB out of 24 available. Sigh...
so the updated driver was the solution?
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#14
Quote from komondor View Post :
Ok I think it has to do with dual and single rank Dimms each dual rank DIMM is actually seen as 2 chips which is interleaved with 6 chips interleaved it makes 12 actual or virtual chips depending on how you want to look at it, if you use 4 chips is dual config you get 16 that is probably the most the motherboard can support. Did you update the chipset driver

https://www.evga.com/support/download/
Quote from KO3bIPb View Post :
Thank you! I am ashamed I didn't think of that, now it shows 20GB out of 24 available. Sigh...
can you guys break it down a bit?
is there a physical tell on the ram or on the product info?

Thanks
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#15
Quote from cheap_bastid View Post :
so the updated driver was the solution?
now it shows 20GB out of 24 available. 4GB is still missing.
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