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Rampage IV Formula Board from ebay.. Defective?

tripster69
Level 7
88134

Hi all, has anyone seen this error before on x79? Is it a board defect?

Windows reports 12gb ram, CPU-Z detects the full 16. Memory is in triple channel, not quad?
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4 REPLIES 4

tripster69
Level 7
88135

Timings as above, advanced timings all set to Auto, CMD rate changed to 1T.

It now shows as Quad Channel but windows task manager still says 12GB ram?

tripster69
Level 7
88136

This time it booted in 1T but shows triple again.

Please, if anyone has seen this issue before?

tripster69
Level 7
88138
88139

It's not looking good... 12g in memtest, 4 DIMMs in BIOS

Silent_Scone
Super Moderator
Try reseating the CPU. If this doesn't help, try POST with one DIMM inserted in the channel that's dropping.
13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090