i7-9800X- PCIe3.0 (up to 44 lanes, up to 985MB/s each)
- 1 DIMM per channel DDR4-2666 (up to 4x16GB DIMMs, up to 21.3GB/s each, up to 86.4GB/s max)
- 2 DIMM per channel DDR4-2400 (up to 8x16GB DIMMs, up to 19.2GB/s each, up to 86.4GB/s max)
X299 = DMI3.0x4 (3.93GB/s total PCH-to-CPU bandwidth)
- all onboard PCIe3 lanes, SATA ports, USB3.0 and USB2.0 ports, LAN, audio, and embedded functions (RST, IME, SC, SM Bus, ASMedia chipset addons, etc) use this bandwidth.
You'll have to look through the specs and reviews for that mobo to figure out how/where/what onboard services are implemented. I'm guessing that 3xNVMe linked into CPU is going to limit your SLI options (x16/x16 may or may not be possible). I'm guessing that 4xSATA and all (10? 14?) USB ports plus soundcard and network and motherboard hardware functions can easily exceed total DMI3x4 bandwidth if all the devices are simultaneously active. Read the manual and perhaps choose a workstation-grade mobo if you intend to have very heavy hardware load.
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