Samsung 850 Pro SSD is slow

Sevelos

Reputable
Jan 25, 2015
6
0
4,510
I have the Samsung 500GB 850 Pro SSD. Computer: Asus n750jk 8GB. Sata 3 (6 Gb/s). Windows 8.1 64bit. AHCI.
Except Samsung Magician, other benchark results are way lower than the results I see everywhere on the net of this SSD.
Tried with Rapid Mode on/Off, Write Cache Buffer Flushing on/off.

For example: HD Tune pro 5.50, no RAPID, no WCBF.
Read Minimum: 208MB/s, Maximum 328.8 MB/s, Average 291.8 MB/s. access time 0.135ms, Burst Rate 199.6 MB/s, CPU average: 10.3%.

Any ideas how I can improve this?
 
Solution
You're literally grade grubbing at this point. Your Sequential read is 529 out of 550 and your Seq write is 495 out of 520. You will never see a difference whether you are at 529 or 550.

Every system is different. I've seen two exact same computers with exact same hardware and used the same Windows install disk and same drivers and one of them always reaches past the 550 read 520 write and the other one always stays in the 510 range. That's why they put UP TO.

Are you using free HD tune or HD tune Pro? Cuz the free version, i think 2.55, has benchmark settings only for HDDs, while the pro version has settings for both HDDS and SSDs.

Lastly, These are all synthetic results, they don't reflect real world usage.
Thanks iceblitzed, but this didn't help. I have AHCI, Sata 3, no indexing, write cache is on, no superfetch/prefetch. The drive is connected as the main hard-disk in my laptop, so I don't have a choice of various port providers. TRIM is enabled. Drivers from 2014.

Example of more results:
Crystal Marks (1000MB):
Read seq: 529.2, Write: 495.6
Read 512K: 418.1, Write: 481.1
Read 4K: 38.50, Write: 115.2
Read 4K QD32: 393.7, Write: 351.2

I know this is not catastropchic, but these results are low for this drive.
 


Your sequential numbers look fine. What does Samsung Magician say your speeds are? Remember its advertised as UP TO, not you WILL GET these numbers.
 
You're literally grade grubbing at this point. Your Sequential read is 529 out of 550 and your Seq write is 495 out of 520. You will never see a difference whether you are at 529 or 550.

Every system is different. I've seen two exact same computers with exact same hardware and used the same Windows install disk and same drivers and one of them always reaches past the 550 read 520 write and the other one always stays in the 510 range. That's why they put UP TO.

Are you using free HD tune or HD tune Pro? Cuz the free version, i think 2.55, has benchmark settings only for HDDs, while the pro version has settings for both HDDS and SSDs.

Lastly, These are all synthetic results, they don't reflect real world usage.
 
Solution
Thanks, Palorim12. HD-Tune pro indeed gives more reasonable results:
Read: 415MB/s minimum, 445MB/s maximum, 436 average, access time: 0.051, burst: 272.6, CPU usage: 2%.
Is there a good test you recommend for simulating "real-world" usage? One with published results of Samsung 850 PRO 512GB ? I'll publish here my results.