Hi,
I am using an Asus X299 TUF Mark 1 MOBO with the latest BIOS and memory modules from the QVL list.
All four sticks are OK when installed individually.
CPU-Z sees all four but OS reports only 3 slots are occupied.
BIOS also recognizes all four modules.
Any ideas?
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Are all memory same brand and model?
Download, extract and run HWInfo
Close the summary. Select memory. Take a screen shot and post here as an image.
Stupid question: do you have the DIMMs installed per the manual?
Which CPU are you using? 4 core supports dual channel RAM, 6 core and up quad channel.
You could try booting the PC with a single DIMM. Try the DIMM in each of the four slots you've used. (I know that there will be a specific slot recommended for a single DIMM, but I hope that the PC will boot with a stick in an arbitrary slot.)
I had something similar with an AMD based system. Turned out to be a defective CPU socket. I suppose that something similar could happen with an Intel LGA system. The similarity is that I believe the memory controller on current AMD and Intel models resides on the CPU, not the motherboard chipset.
Best of luck.
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