x299 motherboards compatible with ECC RAM support.
x299 motherboards compatible with ECC RAM support.
You're dealing with an i7-9800X and ECC DIMMs that aren't recognized on your EVGA X299. It sounds like the RAM is already registered. You might want to check other compatible boards like an ASUS ROG Strix or MSI MAG, which support similar configurations.
ECC isn't available on Skylake-X, and rdimms aren't supported even at the WS/E3 tier of machines