OWC Accelsior S PCIe Adapter for 2.5-inch SATA 6G Expansion Card Compatible with Mac Pro (2006-2012), Mac Pro 2019 and PC Towers

Installed in a MSI X58 Pro 1366 socket with tri-channel memory, a system I built in 2009. This Motherboard/system was limited to SATA II (3Gbps) so after buying a Samsung 850 EVO SSD I wanted to get full speed. My system is dual boot (Win 10 & Fedora 25). I installed the card in a PCIe x16 slot that operated at a max of PCIe X4. Basically no issues. I was concern there was going to be an issue with the Samsung SSD being dual boot but definitely plug and play couldn't be easier. I noticed during boot that the PCIe bus speeds registers as PCIe 2.0 x2 and NOT PCIe 2.0 x4 but not an issue as both speeds are faster that SATA III (6Gbps). My speed measured using the Samsung Magician software went from approximate: (284 read, 271 write randoms; 52409 read, 41961 write IOPS on SATA II to 553 read, 526 write; 88649, 71680 respectively with the OWC adapter card). Yes I can tell the difference in boot to both Windows 10 and Fedora Linux is about half but it was very fast anyways after upgrading to SSD from Hard Drive. Windows 10 went from 15 seconds to 8 seconds on the boot while Linux went from 8 seconds to 5 seconds but in the Linux boot there is a program that is configured to take 6 seconds on boot so very fast if I was to turn it off or reduce it! Note: CPU i7 920 OC to 3GHz from 2.6GHz, OCZ DDR3 1333 ram OC from 1066 to 1500 MHz. Graphics is now Radeon RX 460 OC with 2GB Ram, 500W power supply, and 2 DVD drives, Creative XFi sound card and old Zoom modem 3025C that doesn't work with Windows 10. I have one PCIe x16 slot left and 1 old PCI slot left all in a ELITE Mid or Medium tower case. In all honesty I didn't need the upgrade as the system was very fast already for mainly browsing the internet but the OWC card performs as advertised. I would definitely rate this as a buy to extend the life of an older computer.

I purchased this card because it's Taiwanese! The Accelsior S gave me 453+ Mbps on my (Taiwanese) Avolution 480 Gb ssd. It's a very good upgrade for my ol' Asus Essentio CM1630! No problems, no drivers, just plug it in! It was immediately recognized by my system. And it has a pretty little blue light on while it functions in the system. Swapping it out from my Apricorn Velocity Solo wasn't a problem but, I did have to re-designate the bios' boot order and drives, i.d.k. why but maybe because my bios is old but it really wasn't a problem. The Accelsior S (as I understand) may be closer to 6G ( i.d.k.) but did give me higher Mbps., I just like Taiwanese products in my Asus (if I can) The integrity is good with this PCie card and my system is stable.

Update: after almost 2 years, it is performing flawlessly. OWC products tend to be a little more expensive but they just work. I've upgraded the drive to a 2TB Samsung 860 EVO and it is dedicated to Lightroom: Lightroom, catalog and caches.The performance results will follow but first a note to HP Workstation users. I'm on my 4th HP workstation over the past 15 years and one common factor (seems to be true of Dell Workstations as well) is that the PCI slots tend to have strange requirements. I'm talking about true workstations, not desktops. My current machine is a HP Z440 with 6-core Xeon, 64GB of ECC RAM and a HP 512GB NVMe drive (all from the factory).I've been running a Samsung 1TB 840 EVO for several years (this machine and a previous HP Z420) in an external case connected to a USB3 hub. With this configuration, it is only about twice as fast as an external hard drive. So I purchased this OWC card from Amazon as a holiday present to myself to improve the performance of the drive. However when the card is placed in PCIe Slot 3 (an X4 slot), which should work fine; the machine cannot boot up. Note that this is not the boot drive. Error 928 Fatal PCIe Error. According to HP documentation, the HP NVMe drive won't work in this slot either.Moved the card to PCIe Slot 5, an X16 slot, and the card works fine. I'm disappointed because I really wanted to run 2 of these cards in my machine, such is life.Now for the performance, keeping in mind that this drive was handicapped running through the USB3 hub.2 different performance tests:Test 1. copying a folder containing 450 files, 7 folders and 33.9GB of filesTest 2. copying a folder with a single 5.5GB fileOld configuration (SSD externally connected)Test 1 - copy from SSD to NVMe - 14min 10secTest 1 - copy from NVMe to SSD - 15min 7secTest 2 - copy from SSD to NVMe - 2min 19secTest 2 - copy from NVMe to SSD - 2min 27secNew configuration (SSD on OWC card)Test 1 - copy from SSD to NVMe - 1min 8sec == 12 times fasterTest 1 - copy from NVMe to SSD - 3min 22sec == 4.5 times fasterTest 2 - copy from SSD to NVMe - 4sec == 34 times fasterTest 2 - copy from NVMe to SSD - 4sec == 36 times faster

Added my SSD to the card and installed into my 2010 Mac Pro 5,1 single CPU upgrade from 2.8 GHz to 3.46 GHz and configured it to be the start up disc and worked very well. The instructions were simple and easy to follow. Very impressive and ordered another card for my 2009 Mac Pro 4,1 upgraded to the 5,1 model recently CPU upgrade from single 2.93 GHz to 3.46 GHz. It is performing exceptionally well with this card and SSD in the PCIe slot as the boot drive in my Mac Pro. The boot time has been exceptionally fast and application response time is much quicker than HDD and the computer is quieter and cooler than ever before. The card comes with the four screws to attach the SSD and instruction and requires no drivers and it’s just simple plug the card along with the SSD into PCIe slot and boot your Mac Pro as you see fit. You would actually see the results as it begins to boot up. Also, I do not use neither of my Mac Pros for gaming so I can not see fit to talk about that agenda.