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Motherboard is MSI MEG Godlike x570 with latest BIOS and chipset drivers (via AMD directly) running a 5950x CPU. #SAMSUNG NVME DRIVER SLOW WRITES UPDATE#Notable changes to the OS in the timeframes involved would be the Cumulative Update For Windows 10 Version 20H2 which took place on the 12th of December but as you can see on the attached image, the write speed was fine on the 14th of December, so unlikely to be related. I've rebooted several times, ensuring that the PCI settings in BIOS are correct (Gen 4). Motherboard chipset drivers are up to date. Upon checking in Samsung Magician, the write speeds have nose-dived, to around 25% of what they were previously. #SAMSUNG NVME DRIVER SLOW WRITES PRO#I have a Samsung 980 Pro 500GB NVME M2 drive. #SAMSUNG NVME DRIVER SLOW WRITES INSTALL#If Linux consistently performs well and Windows consistently performs poorly, I would start by doing another clean install of Windows, and then install the drivers necessary to make sure Device Manager doesn't show any unknown or otherwise problematic devices.I've noted in the last few days that my PC has felt pretty sluggish, both in starting up and also running applications. Are you sure you're looking at the sequential read and write speeds rather than random? If so, are you sure your Linux performance is consistent? If Linux is inconsistent, I would try removing and reseating the SSD in the slot, because I've seen multiple threads here where people were seeing PCIe x1 performance from their Samsung SSDs and reseating the SSD allowed it to operate at PCIe x4 properly. For the CrystalDiskMark speeds, those numbers would be horrible even for an old SATA SSD. It should just keep the Microsoft NVMe driver unless you specifically install the Samsung driver. I've never seen or even heard of that happening. Please note that write speeds are less and has varied from 6MB/s - I'm not sure why Windows Update would be pushing a Surface NVMe driver to your non-Surface system. I have been running CrystalDiskMark to see the speed. I also tried using Dell Automated Application update and it installed various updated drivers but that doesn't help. I have been running Samsung 950 Pro Nvme driver from Samsung site now and it seems to work but at slow speed. If I let Windows update find the latest driver for my Nvme Storage Controller then it installs Surface Nvme Controller instead of Samsung Nvme Controller and it is not optimal either. Use that if you haven't already, and look at the sequential read and write for your post. If you still see significantly different results, what tool are you using to perform this benchmark? CrystalDiskMark is a popular storage benchmarking tool for Windows. Use that if you haven't already, and look at the sequential read and write performance. The Dell Update application simplifies driver installation because it scans your system and tells you which drivers you need rather than you having to browse through to figure out which ones pertain to your system based on its hardware options and make sure you found all of them. If you tested on a completely clean install before you even installed things like the various Intel drivers related to the chipset, you should install those before testing. Of course that doesn't explain the huge discrepancy between Windows and Linux. ![]() As a result, even though the PM951 is capable of approximately 3 GB/s reads in some conditions, due to that system configuration its performance will be limited to at most about 1.8 GB/s, just in case you weren't aware. The does have a PCIe x4 interface for NVMe, but it runs that interface in the power saving GT2 mode rather than the max performance GT4 mode, which is basically the same as having a PCIe x2 interface instead. ![]()
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