My motherboard is a MSI B550-A Pro, with two m.2 slots:
m.2_1, gen 4
m.2_2, gen 3 (when using this the second x16 PCIe slot is unavailable)
I always used my Samsung 970 EVO Plus 1TB as boot drive on m.2_1 and it always run at almost its max speed, but recently the speed dropped at ~880 MBps. Both Samsung Magician and CrystalDiskInfo say the SSD is running at PCIe 3.0x1 instead of 3.0x4. I tried to reboot my pc many times, but nothing changed. I moved my SSD to m.2_2 slot and it worked fine at x4. Then i tried to use a 500GB SSD of the same model on m.2_1 and it ran at x1. So i assume the issue is the slot and not the SSD, unless it's a issue about 970 EVO plus SSDs, but i don't think so (they're both updated at last version and Magician say they're working fine).
The BIOS let you set the gen of PCIe, but not the number of lanes. So i don't know wich settings i should chek.
Currently i only use 1 SSD in the first m.2 slot and i don't use any of the PCIe slots. I use a sata port for a 2TB HDD, but i added it before this issue.
Could it be that the m.2 slot is damaged?
m.2_1, gen 4
m.2_2, gen 3 (when using this the second x16 PCIe slot is unavailable)
I always used my Samsung 970 EVO Plus 1TB as boot drive on m.2_1 and it always run at almost its max speed, but recently the speed dropped at ~880 MBps. Both Samsung Magician and CrystalDiskInfo say the SSD is running at PCIe 3.0x1 instead of 3.0x4. I tried to reboot my pc many times, but nothing changed. I moved my SSD to m.2_2 slot and it worked fine at x4. Then i tried to use a 500GB SSD of the same model on m.2_1 and it ran at x1. So i assume the issue is the slot and not the SSD, unless it's a issue about 970 EVO plus SSDs, but i don't think so (they're both updated at last version and Magician say they're working fine).
The BIOS let you set the gen of PCIe, but not the number of lanes. So i don't know wich settings i should chek.
Currently i only use 1 SSD in the first m.2 slot and i don't use any of the PCIe slots. I use a sata port for a 2TB HDD, but i added it before this issue.
Could it be that the m.2 slot is damaged?
Last edited:
Facebook
Twitter
Instagram