I'm "happy" owner of
Samsung 870 EVO 1TB
SSD. The read speed is a half of rated (only 283 MB/s). What is even more disappointing - the read speed is almost a half of my old SanDisk SD9SN8W-128G SSD (507 MB/s).
What could be a reason?
My notebook is HP 250 G6 . SanDisk SSD is connected to M2 SATA port on the motherboard. Samsung 870EVO is connected to a regular SATA port installed instead of the second M2 SATA port (connected to the motherboard via a flat cable). By the way, the write speeds for both mentioned SSDs are approx. 250 MB/s. A half of rated write speed for Samsung 870EVO 🙁
UPD1 : On installing the latest BIOS for my laptop (version F.70 of 2022) the situation became even more dramatic - no changes in speeds for Samsung, but higher sequential read speed for SanDisk (540 MB/s). I used the latest CrystalDiskMark for benchmarking.
UPD2 : CrystalDiskInfo reports that Samsung SSD is in SATA/300 mode while maximum possible mode is SATA/600. Whereas SanDisk SSD is in SATA/600 (maximum is SATA/600). This info explains the results of benchmark, BUT why my new Samsung 870 EVO is in SATA/300 mode???? I also have an HDD installed in my system (instead of optical disk drive). It's funny but it operates in SATA/600 mode as well! Samsung's Firmware is of the latest version (SVT02B6Q). Here is the picture of the flat cable with SATA socket I used to connect Samsung SSD to the motherboard: link to the picture .
UPD3 : I decided to do some experiments trying to 1) understand the reason, 2) find solution for my situation.
I still don't understand what's going on, but I've got a configuration, which gives maximum speeds from my drives!
My notebook is HP 250 G6 . SanDisk SSD is connected to M2 SATA port on the motherboard. Samsung 870EVO is connected to a regular SATA port installed instead of the second M2 SATA port (connected to the motherboard via a flat cable). By the way, the write speeds for both mentioned SSDs are approx. 250 MB/s. A half of rated write speed for Samsung 870EVO 🙁
UPD1 : On installing the latest BIOS for my laptop (version F.70 of 2022) the situation became even more dramatic - no changes in speeds for Samsung, but higher sequential read speed for SanDisk (540 MB/s). I used the latest CrystalDiskMark for benchmarking.
UPD2 : CrystalDiskInfo reports that Samsung SSD is in SATA/300 mode while maximum possible mode is SATA/600. Whereas SanDisk SSD is in SATA/600 (maximum is SATA/600). This info explains the results of benchmark, BUT why my new Samsung 870 EVO is in SATA/300 mode???? I also have an HDD installed in my system (instead of optical disk drive). It's funny but it operates in SATA/600 mode as well! Samsung's Firmware is of the latest version (SVT02B6Q). Here is the picture of the flat cable with SATA socket I used to connect Samsung SSD to the motherboard: link to the picture .
UPD3 : I decided to do some experiments trying to 1) understand the reason, 2) find solution for my situation.
- I left the Samsung as the only hard drive in the laptop, connected via flat cable to the MB (SanDisk and Seagate HDD are removed). No changes in speed . Samsung is still in the SATA/300 mode.
- I put the Samsung to the adapter instead of the Seagate HDD (the adapter is a replacement of the DVD drive). The effect is WOW! The Samsung is in the SATA/600 mode (as HDD was before). Read/write speeds are 562MB/s / 527 MB/s. Awesome!
- I added SanDisk connected to the M2 SATA on the MB. Both are in SATA/600 mode. Speeds are top!
-
All I had to do is to connect Seagate HDD to the socket (with the flat cable) where I tried to connect the Samsung initially. Who cares? - Its speeds are 60MB/s, so SATA/300 should be enough. But what the hell!!! CrystalDiskInfo shows that HDD is in
SATA/600 mode
...
I still don't understand what's going on, but I've got a configuration, which gives maximum speeds from my drives!
Last edited:
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