My long story short, I've replaced the evo ssd with another, which behaved exactly the same. At least using storahci drivers it's stable, but C7 errors keep accruing, and writes are crippled. Interestingly, it works perfectly fine on the asmedia controller, though slower, and without full support of things like virtualization. I've finally replaced the Samsung 860 Evo with Crucial MX500 and the magic happened! No more issues of any kind on the SB950 controller using storahci drivers. I'll next update to amd drivers, just to check the difference, but it works fine as it is. Both samsung ssds went back to amazon with a detailed 1-star review of the drives. Shame on you Samsung engineering!!
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I've had most of the same experiences as listed here. I've previously had an older Gigabyte mobo with SB750, Phenom II x6 1100T, SandiskSSD and Win 7 x64 Ult. At some point I started getting weird freezups, and in retrospect, I think it started after updating some drivers, but I don't know which. At that time I was suspecting hardware, so I replaced the SanddiskSSD to new Samsung EVO 860 500GB. When I started running tests, the speeds at SATA II (limitation for SB750) were showing fine, as below (this was with sorahci driver): I downloaded HDTune and also noticed that on every reboot, Samsung SSD had incrementing C7 errors (supposedly bad communication). Long story short, I replaced SATA cables several times, checked different ports, installed fresh Win 10 (my system freezups stopped after installing Win10), replaced Gigabyte with new Sabertooth 990fx R2.0, updated to latest BIOS 2901, converted disk with MBR2GPT, updated all drivers... yet the C7 errors continue, but only on the AMD chipsets. I'm now running fully in UEFI with secure boot, Win 10 Pro, Sabertooth 990fx R2.0, Phenom II x6 1100T, 8GB RAM (will update to 16GB soon), and Samsung EVO 860 500GB. Since I've updated all my drivers for the new board, inadvertantly, my ahci drivers were updated to amd_sata and this caused extreme instabilities with the Samsung drive. Occasional frrezups, trying to start CrystalMark was extremely slow, so I gave up trying, and even running backups was failing. I switched the drive to the ASM1601 controller on the Sabertooth, and the stability improved and C7 errors were no longer showing up after reboots. However, even though AsMedia is a SATA 6 controller, it doesn't run in full speed. See below: I read somewhere that the way it's engineered into the motherboards its speed is limited by the PCI or hypertransport throughput (or something like that, can't remember exactly now). So that would make sense. While I had the system disk and all other drives disconnected from AMD controller, I uninstalled the AMD SATA controller (with remove driver files), scanned for hardware changes and let Windows install the native storahci driver. I searched for any driver upgrades, but the storahci driver dated 2006 is the latest available for Windows (even Widows 10). I then swithed the Samsung SSD from AsMedia to AMD SB950 controller again and booted this time using the storahci driver. The stability is good now. No problems running any programs, but the C7 errors increment on every reboot again. However, when I ran CrystalMark and AS SSD, it shows overall speeds improved, but 4K write is crippled!! WTH?!? I've ordered a replacement Samsung EVO 860 SSD from Amazon, and it arrived today, sitting on my desk. I'll soon replace it and return the other one back, but I have a feeling nothing will improve. 1) Does anyone have any idea why this TLC NAND Samsung SSD is running so badly on default Windows drivers under AMD SB950 controller? I'm not even gonna try AMD drivers again. It's a disaster (not sure if by AMD, or by Samsung compatibility). 2) Can anyone with similar hardware configuration recommend a proven 500GB SSD I can use instead? Would MLC NAND be more compatible with SB950? I'm tempted to try the Sandisk I have, but it's a smaller drive, so even if it works well, there's no guarantee that when I buy the 500GB, it'll work exactly the same. Thank you!
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