motherboard see 16g of ram but only use 8g

fmofmofmoQc · Feb 13, 2016

Hi,

I have strange problem with my motherboard (ASRock Z75 Pro3 with i7 2600k). I have 4 identical memory stick - 4 x 4Gb Patriot 1866 DDR3. If I populated all 4 memory slot, the BIOS only show 8Gb (A1 and B1 are set as empty in BIOS) at only 1333Mhz. The weird part is if I select System Browser in main screen BIOS, I can see all 4 DIMM at the correct speed (1866Mhz) and i can also see all 16g in cpu-z.

If I remove all memory stick and put only two memory stick in slots A1 and B1, BIOS show 8Gb of RAM so those two memory slots are functioning, it's not a hardware problem. I have also try to clear CMOS, use other type of ram, reinstall CPU and updating bios.
Also i can't select the xmp profile in bios in can't go over 1333Mzh in speed

I can't find a way to correct the problem

Thank for your help

Lutfij · Feb 14, 2016

Can you pass on the information found on the sticker placed on your ram(if they are all the same then one sticker information is alright but if there are any minute changes then please relay them here)? Can you manually set the frequency for your rams in your BIOS? If a BIOS update didn't help then perhaps downgrading a step or two in BIOS revision? This sort of an incident did happen while I was working on a client's system whereby a BIOS revision 2 tiers higher didn't want to accept any input I gave towards memory and voltage settings let alone overclocking the APU platform.

fmofmofmoQc · Feb 14, 2016

The ram are all the same and i know there are working together because they were working on my old motherboard. Also in the bios i can only choose between 1066Mzh or 1333Mzh. I also try to downgrade bios but still see empty a1 and b1 slot but in the system browser i can see the 16g.

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motherboard see 16g of ram but only use 8g

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