Slow write speeds but normal read speed (Samsung 860 evo 250 gb)

kamisama-

Junior Member
Sep 7, 2018
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0
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Hi,

I'm running a 250GB SAMSUNG 860 on a ASUS Z370 tuf pro gaming motherboard, i7 8700k , 8GB ddr4 3000 RAM.

With AsSSD and ATTO, my read speeds are as expected (normal i guess), with 510-530MB/s, but my write speeds cap at about 300-310Mb/s.

AsSSD result : https://prnt.sc/krwwgk

Firmware updated to the last version.

Any ideas where should I start?
 

VirtualLarry

No Lifer
Aug 25, 2001
56,326
10,034
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My question - what drive(s) are you writing FROM?

Edit: Oh, nevermind, it's a benchmark, it generates data to write to the drive itself.
 

UsandThem

Elite Member
May 4, 2000
16,068
7,380
146
What driver are you using? If you're using the Intel SATA driver, that is likely the problem as I spent close to a year trying to figure out why all my 850 EVOs were slow. It turns out the generic Microsoft driver is much faster.
 

kamisama-

Junior Member
Sep 7, 2018
4
0
6
What driver are you using? If you're using the Intel SATA driver, that is likely the problem as I spent close to a year trying to figure out why all my 850 EVOs were slow. It turns out the generic Microsoft driver is much faster.
results same with iastor and microsofts driver. :(
 

UsandThem

Elite Member
May 4, 2000
16,068
7,380
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results same with iastor and microsofts driver. :(

The only other thing I can think of is maybe trying a different SATA cable. Outside of that, make sure you don't have any background programs (or services) running that would drag down your write scores.

Have you tried testing the speed in Samsung Magician?
 

kamisama-

Junior Member
Sep 7, 2018
4
0
6
vv
The only other thing I can think of is maybe trying a different SATA cable. Outside of that, make sure you don't have any background programs (or services) running that would drag down your write scores.

Have you tried testing the speed in Samsung Magician?
results are same on all benchmarks(samsung magician, atto , as ssd , crystalmark etc.) and i will try with another sata cable. is there any probram to test ssd if it has bad sectors like hard disk ? samsung magician shows ssd works normally.
 

VirtualLarry

No Lifer
Aug 25, 2001
56,326
10,034
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What is your Windows Power Plan set to? Try setting it to "High Performance", rather than "Balanced", or disable "C-States" in BIOS/UEFI.

CPU power-saving can affect SSD benchmarks. (Though, most SSD benchmarks now know enough to stress the CPU while running them.)
 

UsandThem

Elite Member
May 4, 2000
16,068
7,380
146
vv

results are same on all benchmarks(samsung magician, atto , as ssd , crystalmark etc.) and i will try with another sata cable. is there any probram to test ssd if it has bad sectors like hard disk ? samsung magician shows ssd works normally.

CrystalDiskInfo will give you the drive health, but the SMART readings will be the same you see in Samsung Magician.

It likely isn't your drive having defects, but more likely a setting (like VLarry mentioned above), cable, program, or something like that. If the drive is reporting good health, I'd really be surprised that report wasn't accurate.
 

VirtualLarry

No Lifer
Aug 25, 2001
56,326
10,034
126
Oh yeah, disable your anti-virus too... (for the test, then re-enable it afterwards).
 

kamisama-

Junior Member
Sep 7, 2018
4
0
6
power option on high performance so i only need to test sata cable then i will try to get one to test. :/