Question Weird Boot Time Behavior

[jon96789]

I originally bought a MSi X570 MPG Gaming Pro Carbon WiFi motherboard with an AMD Ryzen 9 3900X and a Samsung 1 TB 970 EVO Plus M.2 NVMe SSD with a fresh install of Windows 10 Pro. The system took about a full minute or so to boot up (30 seconds for the BIOS post and 30 seconds for the SSD boot time). Because of VRM thermal issues I replaced the motherboard with a ASUS X570 ROG Crosshair VIII Hero. The boot time did not change.

My grandson needed a PC so I used the unused MSi motherboard and bought a new AMD Ryzen 7 3700X, a Samsung 512 GB 860 EVO SATA SSD and built another PC with a fresh build of Windows 10 Pro. The new desktop now boots up considerably faster than the 3900X system, taking only 30 seconds (15 seconds for the BIOS boot and 15 seconds for SSD boot) or so.

The 3900X system was tested and the M.2 NVMe SSD shows itself to be 5-6x faster than the Samsung SATA SSD. So why is the slower 3700X system so much faster in booting over the 3900X system?

System configs:
AMD Ryzen 9 3900X CPU
ASUS X570 ROG Crosshair VIII Hero Motherboard
MSi Geforce RTX2070 True Gaming GPU
Samsung 1TB EVO Plus M.2 NVMe SSD
32GB Corsair Vengeance DDR4 3000MHz memory
Corsair CX850M 850-watt PSU
Corsair H115i RGB Platinum radiator

AMD Ryzen 7 3700X CPU
MSi X570 MPG Gaming Pro Carbon WiFi motherboard
MSi Geforce GTX1660Ti Gaming GPU
Samsung 512GB EVO SATA SSD
16GB Corsair Vengeance DDR4 3000MHz memory
Corsair TX650M 650-watt PSU
AMD Wraith Prism air cooler

 

[kerberos_20]

there is bios update which reduces boot time (in bios)

 

[jon96789]

I updated both boards to the latest BIOS available...

 

[jon96789]

I figured it out... I read another post that when using an M.2 device, you must not use the last two SATA channels as it conflicts with the M.2 channels. I checked my BIOS and SATA ports 4-8 were being used. After reconfiguring the ports to 1-5, the boot speed is super quick...

The BIOS boots in 12 seconds and the OS boots in 20 seconds... total 32 seconds...