Recently, I was having some performance issues with my Samsung 970 Plus evo. I was getting 3500+mbs reads, then I ran a performance check and I was getting 890 mbs out of nowhere. My Samsung 860 EVO(2.5" SSD) was performing flawlessly.
I was in AHCI, formatted the drives, and performed a clean installation of windows. Samsung magician ran a clean diagnostic scan, driver was up to date, and interface was correct.
After some research, I unplugged the 2.5" SSD from the 3rd HDD bay. I performed Samsung magician and now I am back to 3500 mbs read 3200 write. I am pretty happy.
I am concerned though. Has anyone else seen this issue? Is there something wrong with my moptherboard ? Is it typical for computer to share resources?
I am waiting on getting a longer SATA 3 cable to try the 4th HDD bay.
Side note: Can I connect two SATA III cables together to make a longer cable?
Solved! Go to Solution.
finally, I was able to resolve this. It seems you *MUST* plug the SATA III plug into #6 per the link below (SATA 6 Gbps drive connector (SATA1)
Every single time I tried the #7 or #8 SATA slots, it would impede perforamance for the NVMe to 800mbs...
Now, the NVMe rreading 3500mbs and writing 3000mbs , the 2.5 in SSD is reading 562mps and writing 531.
Oddly, the PCIe NVMe changes interface in Samsung magician when the 2.5 SSD is plugged in, which I assume is causing the issue.
I'm still waiting on a longer data cable to try the 4th HDD bay
It may just be a software issue with the Magician benchmarking software. You can double check the results with Crystal Disk.
Also, no need for a longer SATA cable. The physical location of the drive is not relevant. It's the data cable that matters. So if you think there's an issue with the header to that drive caddy, you can just move the SATA data cable connected to the motherboard header to a different SATA header. It's the same as moving it to a different caddy. You don't say what PC you have, but usually the SATA headers are all lined up in a row right next to each other about .5 cm apart each.
This is an R9 BTW.
Is that with another 2.5 SSD plugged in ? If so, I'd love to get more info.
I tried re-routing the cable, which coincidentally was already plugged into the '4th' SATA slot. After I plugged into the 3rd SATA slot,Support assist said that I had a failing drive, and wouldn't load windows, which is odd. So I tried unplugging the SSD altogether and same issue. Eventually, I had to plug the 2.5 SSD back into the 4th SATA slot for it to appropriately load the OS.
SupportAssist is terrible.
Without the 2.5 SSD
With the 2.5 SSD
If you cannot remove the 2.5" ssd then windows was installed incorrectly accross both drives. It sounds like windows probably put a hidden boot partition on the 2.5 ssd and is looking for it at boot. You need to remove all drives except the OS drive (970 evo) when you install windows. Otherwise stuff like this happens.
I have 4 drives (three samsung nvme, and a 2tb toshiba sata hdd) and an internal dvd drive.
For some reason it adjusted the boot priority options, which I had to readjust with Windows boot manager at the top.
I just formatted the second drive, and has no files on it.
Also, when I reinstalled windows, I formatted both drives, then actually had to format the second for it to show under my PC. Do I still need to reinstall windows with only the NVMe?
Also, I can't see your photos yet (need to be mod approved) but if the results are bench-marking both drives simultaneously vs. one drive at a time, the reduced speed may be a product of the bench marking software and/or utilization of system resources with that software.
Here's my post about installing the drives if interested:
I've actually read that before 😁(Thanks for your info BTW, it is much appreciated..)
At this point, I'm coming to the conclusion that there is some sort of shared resources involved with the SATA III port and the M.2 slot on the motherboard.
I may end up selling this and going for a setup similar to yours.