z77 Extreme 4 - Recongizing 8 out of 16 gb of RAM - Win 10

Hi guys,

I have already known issue on the internet which I'm still not able to solve.
As described in the Topic Name, I have 4 x 4gb of identical RAM set on my motherboard.
It is Corsair - PC3-10700 (667 MHz) CMZ8GX3M2A1866C9.

Prior to re-installing my OS ( previously Windows 10 Pro 64bit , now the same OS ), OS was recognizing normally 16gb, but from the latest installation it only seems to have recognize is half , 8gb.

Please find below already the steps which I have taken but with no results:
Checked the Maximum RAM option in msconfig.
Updated BIOS to the latest version.
Tried all the possible combinations of the memory cookies - same result.
Tested all cookies 1 by 1 to verify that they work - yes.

Interesting things:
-No combination of the RAM cookies can show > 8GB. ( so 12GB with 3 cookies, or 16GB with 4 are now never displayed ).
- Regardless of the RAM cookies order, bios only recognizes 1st and 3rd, and if I open "Component Browser" -> UI in the bios where the user goes with the mouse over the motherboard components, all 4 slots are recognized.

Memory is set in dual channel, and all on the same latencies. 9-9-9-27.

Also, OS does not recognize > 8GB ram, but Everest, Speccy etc, recognize is without a problem.
Speccy recognizes 16384 bytes as the amount of the available memory, but a few lines below, where Physical Memory is stated, it is displaying only 7.96GB ~ 8GB.

Please find the Speccy screenshot below:

Please let me know if I can help you additionally with some data.

Thanks in advance.


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Reply to: z77 Extreme 4 - Recongizing 8 out of 16 gb of RAM - Win 10
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I think I see why your first post didn't make it.
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I have 4 x 4gb of identical RAM

No you don't.
You have 2 kits of matched pairs.
That does not mean kit #1 is a match for kit #2 even if they are the same part number.
Don't mix sticks between the kits.
Work with the bios and forget windows.

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