Very slow speed on SSD

Hi experts,

I am getting strange behavior for ESXI6.5 (installed as test at my home clone server). Like i have installed 2 SSD, one is Intel M.2 and another is transcend SATA III SSD. from both SSD i have created datastore. But i am getting different speed on the 2 SSD like on intel i am getting full speed but on transcend i am getting only 16mbps speed. tried to search google, but didnt got any solution. my ESXI is installed on intel M.2 SSD.

Pls find the speed diff (2.02 vs 22.77 MB/s) t10.ATA is transcend and NVMe is Intel M.2

Pls suggest what to do.

My server config:

Processor: Intel(R) Core(TM) i7-6800K

RAM: 128GB

Motherboard : GA-X99-Ultra Gaming

No RAID