Very bad speed with nvme drive

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   Hello, 

I do have a Phantom X X570 motherboard, 3900X cpu and Sabrent nvme4.0 1TB drive in the first slot, which is directly connected to CPU.  OS is W10 pro and everything (AMD drivers, W10, Bios 2.70, etc.) is up to date. Sabrent doesn't have their own driver, Microsoft's one is used. 

When running Crystal disk mark 64 I get good reading speed 4.999 GB/s but only 1.020 GB/s when reading 1 GB file. I checked the drive temp and HWinfo64 shows only 38oC. So throttling is not the culprit. 

I've searched the web but cannot find what's wrong. When I set up the system 3 months ago, I remember having good read and write speeds. 

What could I check ? 

Thanks 

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John22 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 16 Dec 2019 Location: Canada Status: Offline Points: 16	Post Options Post Reply Quote John22 Report Post Thanks(0) Quote Reply Topic: Very bad speed with nvme drive Posted: 16 Dec 2019 at 9:36am
	Hello, I do have a Phantom X X570 motherboard, 3900X cpu and Sabrent nvme4.0 1TB drive in the first slot, which is directly connected to CPU. OS is W10 pro and everything (AMD drivers, W10, Bios 2.70, etc.) is up to date. Sabrent doesn't have their own driver, Microsoft's one is used. When running Crystal disk mark 64 I get good reading speed 4.999 GB/s but only 1.020 GB/s when reading 1 GB file. I checked the drive temp and HWinfo64 shows only 38oC. So throttling is not the culprit. I've searched the web but cannot find what's wrong. When I set up the system 3 months ago, I remember having good read and write speeds. What could I check ? Thanks

gizmic Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 13 Jun 2018 Location: Hong Kong Status: Offline Points: 677	Post Options Post Reply Quote gizmic Report Post Thanks(0) Quote Reply Posted: 16 Dec 2019 at 10:31am
	its normal when you have caching enabled and testing over a huge file


John22 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 16 Dec 2019 Location: Canada Status: Offline Points: 16	Post Options Post Reply Quote John22 Report Post Thanks(0) Quote Reply Posted: 16 Dec 2019 at 11:44am
	If you search the web a bit you will easily find that Sabrent nvme 4.0 t TB speeds are ALL validated with Crystal disk Mark and all use 1GiB file size. Writing speed is then around 5.0 GB/sec and Writing speed is around 4.2 to 4.4 GB/sec. Also I remember having seen scores like that. I forgot to mention memory : 16GB G.Skill CL16 Trident z Royal 3600.

John22 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 16 Dec 2019 Location: Canada Status: Offline Points: 16	Post Options Post Reply Quote John22 Report Post Thanks(0) Quote Reply Posted: 16 Dec 2019 at 11:51am
	I forgot, disk is 13 % full ... There's something wrong somewhere for sure.

gizmic Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 13 Jun 2018 Location: Hong Kong Status: Offline Points: 677	Post Options Post Reply Quote gizmic Report Post Thanks(0) Quote Reply Posted: 16 Dec 2019 at 12:12pm
	you totally ignored what i said disable cache


John22 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 16 Dec 2019 Location: Canada Status: Offline Points: 16	Post Options Post Reply Quote John22 Report Post Thanks(0) Quote Reply Posted: 16 Dec 2019 at 12:49pm
	Here's the result without cache : Reading 4.988 GB/sec writing 0.318 GB/ sec. Not what you expected.

gizmic Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 13 Jun 2018 Location: Hong Kong Status: Offline Points: 677	Post Options Post Reply Quote gizmic Report Post Thanks(0) Quote Reply Posted: 16 Dec 2019 at 1:44pm
	seems about right when you run it again with it enabled it will run closer to max speed if it doesn't then you need to open your task manager to see whats using disk & memory activity in my case to get max speed on crystalmark i need to close razer synapse and run the bench


gizmic Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 13 Jun 2018 Location: Hong Kong Status: Offline Points: 677	Post Options Post Reply Quote gizmic Report Post Thanks(0) Quote Reply Posted: 16 Dec 2019 at 2:03pm
	heres mine different drive but pretty much the same reason why its slow first, cache enabled second, cache disabled third, cache disbled + razer synapse off fourth, cache enabled + razer synapse off or to get best score without fiddling with anything i run the test with 9 passes


John22 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 16 Dec 2019 Location: Canada Status: Offline Points: 16	Post Options Post Reply Quote John22 Report Post Thanks(0) Quote Reply Posted: 17 Dec 2019 at 12:03am
	I did some testing and found something strange ... I unclicked the disk cache, set 9 passes, did a test getting low write speed as expected. Then, clicked the disk cache, did the test and got reading @ 5 GB/Sec and Writing @4.3 GB/Sec. I thaught I got it! Did the test again and again with all parameters you can imagine and writing felt back to exactly 1.02 each time. I Looked at Task manager and saw the CrystalDiskMark disk usage reading was Ok when reading but CrystaldiskMark disappears from Task Manager when doing writing test. I decided to look at ATTO disk. Everything is consistent with this software test. I get a bit lower values which is known, but consistent values close to 4.0GB/s for writing and 4.4GB/sec for reading. So to me the CrystalDiskMark 7 version is buggy .. End of problems ! Thanks