Where is my 24gb go?

[BruceUSA]

hello all,

I got some question, I got 64gb of ram ddr3 1866mhz 1.5v. I tried to oc the ram to 2133mhz with 1.6v, and stock timing. The pc would not boot into windows. Anyhow, I can run 2133mhz with stock voltage and stock timing, but where is my 24gb of ram go? Intel CPU Usage show only 40gb of ram total. But I have 64gb in it. When I run it at 1866mhz, it shown all 64gb of ram. Any boby know why?

 

[ZL1]

operating system ?

 

[BruceUSA]

Windows 7 pro 64 bit

 

[ZL1]

hmm, so during boot do you see all 64gb ? bios post i mean
and in windows you see 40 ?
try resetting everything see what gives

 

[BruceUSA]

During booting into Windows, you can't see it. After booting into windows, my Intel CPU meter show only 40GB total. If I run it at stock 1866mhz, then it will show 64gb. What I got in this order.

1)Run it stock at 1866mhz> CPU meter shown 64gb of ram (Manual in bios)
2)Run oc 2133mhz with stock 1.5v and stock timing (Manual in bios) > booting into windows. CPU meter shown only 40gb of ram total.
3) Run oc 2133mhz with stock 1.5v and stock timing.(XMP Profile in bios) > booting into Windows. CPU meter shown only 37Gb of ram total. I don't understand why this happening.
.

 

[ZL1]

did you test any of this overclocking ?
for ram> memtest86 http://www.memtest.org/
for cpu> prime95 http://www.mersenne.org/
also get cpuz (http://www.cpuid.com/softwares/cpu-z.html) and see spd, see if all sticks show after oc, it may be that a few sticks dont like the oc
and coretemp to watch ur temps while priming http://www.alcpu.com/CoreTemp/

note an OC is not valid til its tested, you can loose data and corrupt stuff around, let alone have instabilites due to an untested oc

 

[ATMINSIDE]

Sounds like you're hitting a point of instability in the RAM. Just leave it at 1866MHz, you won't notice the difference anyway.

 

[BruceUSA]

Sounds like you're hitting a point of instability in the RAM. Just leave it at 1866MHz, you won't notice the difference anyway.

I am going to leave it at stock speed. Everything is working like the way it should. Thank you all for your inputs.

 

[Woomack]

You can try bumping VCCSA/VCCIO voltages up to ~1.3-1.35V to check if it's better. Some of these CPUs end at about 2133. Depends from board and memory controller it may work @2133 or not.
On the other hand you won't see any special performance difference between 1866 and 2133.