X399 gaming M.2 Speed

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   Hello, here is a problem. I have two same 970 EVO M.2, but when I add another one on board, the second one speed is like a SATA2 3GB speed. 
Indeed, the maximum speed is about 265MB/s Read an 240MB/s Write. Out of the standard performance. What should be the problem of my board?
Please help me,Thank you!

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Rayblade Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 11 Nov 2017 Status: Offline Points: 13	Post Options Post Reply Quote Rayblade Report Post Thanks(0) Quote Reply Topic: X399 gaming M.2 Speed Posted: 20 Aug 2019 at 2:22pm
	Hello, here is a problem. I have two same 970 EVO M.2, but when I add another one on board, the second one speed is like a SATA2 3GB speed. Indeed, the maximum speed is about 265MB/s Read an 240MB/s Write. Out of the standard performance. What should be the problem of my board? Please help me,Thank you!

ASRock_TSD Members Profile Send Private Message Find Members Posts Add to Buddy List ASRock_Official Joined: 20 Mar 2015 Status: Offline Points: 8532	Post Options Post Reply Quote ASRock_TSD Report Post Thanks(0) Quote Reply Posted: 20 Aug 2019 at 2:33pm
	Dear Rayblade, Greetings, this is ASRock TSD. For this question, we have some suggestions for you to check your system: 1. Please enter the BIOS setup and press [F9] to load BIOS default setting. 2. Remove the other storage devices, only connect one M.2 SSD and configure it as a system disk to verify the SSD performance. 3. Connect the M.2 SSD to other M.2 slots by turns to verify the M.2 speed. 4. If possible, please format the SSD and check the result again; verify if the performance is related to storage data. 5. If possible, please install the M.2 SSD to other systems to verify. Thanks! All the best, ASRock TSD