01-28-2020 10:18 AM - last edited on 03-05-2024 08:23 PM by ROGBot
01-28-2020 10:58 AM
01-28-2020 11:03 AM
davemon50 wrote:
Looks familiar. This you?
https://rog.asus.com/forum/showthread.php?115965-M-2_1-slow-speed&highlight=samsung
01-28-2020 01:01 PM
01-29-2020 01:06 PM
01-29-2020 11:15 PM
wolfman wrote:
As the title suggests, I'm having an issue with my M.2 slots using a samsung 970 EVO plus nvme 1TB drive. I should also tell you that this drive is replacing a Samsung 960 EVO nvme 500GB drive that showed the same issue.
When I test the speed in the M.2.1 slot, located near the bottom of MB, my speed on Crystal disk mark 7 is 1802 read, 1813 write. When I use the M.2.2 slot, located near the CPU, I get the following results, 3268 read, 2880 write.
I am using the latest BIOS, 3004 from Asus. My MB is Asus ROG Crosshair VII Hero WIFi, CPU is a Ryzen 2700+, 16 Gb DDR4 3200RAM, windows 10.
I'm just wondering why the speed is basically cut in half using the M.2.1 slot. I have reset the BIOS to default and nothing works as far as getting full speed on the M.2.1 slot.
Any suggestions?
01-30-2020 08:43 AM
Baio73 wrote:
Hi,
Asus made a little mess with this board* as they called the upper slot (the nearest to the CPU socket) M.2_2 and the bottom one M.2_1 (which is not so intuitive as the PCIEX slots are numbered starting from the upper one).
So the upper slot is the slower, as it shares ìlines with PCIEX slot 1 (where one usually plugs the VGA) and the bottom slot is the faster, as it does not share anything.
Hope this may help!
Baio
* I've just discovered that USB15 header can't drive 2 USB ports… so a topboard like this has only 3 onboard USB ports… WTF!!!
01-30-2020 01:53 PM
wolfman wrote:
Thanks for the reply. I understand the information regarding M.2.1 and M.2.2. My issue is that M.2.1 is HALF the speed of M.2.2. My 970 evo has a speed of 1802 read, 1813 write in the M.2.1 location and a speed of 3268 read, 2880 write in the M.2.2 location.