Dual NVMe PCIe Adapter, RIITOP M.2 NVMe SSD to PCI-e 3.1 x8/x16 Card Support M.2 (M Key) NVMe SSD 22110/2280/2260/2242/2230

We tested this card (and 3 other PCIe dual NVMe cards) in several 2010 (2009-2012) Mac Pro towers, and ran numerous tests against a variety of NVMe cards.For our testing purposes (done on behalf of a client with a specific need), we were using 450Gb files (yes, 450 gigabyte file size).Note: Performance measurements are HIGHLY dependent on file sizes and the NVMe cards used. We tested on Crucial P2, Kinston NV1, TeamGroup MP33, Western Digital SN350, Samsung 980, Samsung 970 EVO PLus, 1TB and 2TB cards.As an aside, I'd be highly skeptical of reviews wtihout full disclosure of the NVMe cards used, file sizes, and whether or not the NVMe cards were cooled. Otherwise you're comparing apples and oranges.For example, Kingston, Crucial, and other 'low brand' cards held average speeds of approx 750Mb~1Gb thruput. This was somewhat consistent (although Crucial was the slowest in all categories, followed by TeamGroup - which would make sense, as both of these are the 'economy choice' drives). In order to maximize performance we installed heat-sink plates on each drive (another factor the end user should consider adding) - some drives get quite hot and without a head sink they slow WAY down..Samsung 970 EVO Plus cards averaged 1.6Gb - with bursts to 2.2GB - and were on average 2x's the performance of ALL OTHER DRIVES TESTED.. This was a surprise to us.So NVMe card quality is crucial for any test. (note: even the Samsung 980 card is MUCH slower than the 970 EVO PLus - we suspect this being due to the SLC cache controller used, but it was a VERY significantly different performance level.. On large drive transfers, the difference was staggering - the 970 EVO Plus was 80-100% faster than all others for these large-data file trasfers.We also ran the BlackMagic speed tests, which showed consistent to our own transfer time tests. sequential reads were pretty good across the board.. usually random reads were about 1/2 the max speed, but still consistent.This adaptor slightly out-performed the more expensive Ableconn card on 'normal' useage, and over time seems to actually be better. We suspect this is tied to the slightly higher quality heat-sink, as the Ableconn card we tested created a lot of heat and (our opinion) didn't dissipate it as well as needed.It should be understood that this is a switch (ie while both cards are available, the data path 'switches' between cards when they're being used.. So it's not a "dual card". It's a 'switch card'...This means that if you start using both card slots simultaneously (ie., copy data from one drive to the other on the same card), your thruput is cut substantially (the ~1.5Gb thruput drops to ~600Mb-800Mb)..[please note, these numbers are approximate - i'm not going to spend 3 hours compiling all the data we accumulated in our testing which was done for a specific client's needs, for an anonymous amazon review]Another super-important fact to understand is that lower quality NVMe cards suffer TERRIBLY if you start moving large files on them.. They run into buffer issues which show up on files over 50Gb in size, at which point the performance is usually cut by 60-80% (so a 1.5gb thruput will drop to 200Mb!!!)... For example: our test file (450Gb size) took over 25 minutes to duplicate on Crucial drives, but only about 9 minutes on Samsung EVO Plus drives. The same file took nearly an hour on 2 SSD drives (mounted in PCIe>SSD adaptor cards).So do NOT wimp out on drive quality.. you'll regret it, especially if you handle large files.In the end we did NOT stick with this card for our client, but went with individual cards, because this client is using the towers to handle large data files in excess of 400GB, transferring them hourly. The most performant path we found is to use individual EVO Plus NVMe cards on individual slots. This was a game-changer - zero issues, and consistent thruput of 1.6-2.1Gb. We can now copy a 500Gb file using that setup in less than 10 minutes, a process which was nearly 60 minutes on the fastest SSD drives.If I were a 'home user' with a MacPro, and wanted the option for multiple NVMe cards in a Mac Pro, this card would be my choice. It is more performant than the Ableconn, has better heat absorption, and for smaller file size and "normal" usage, the fact that it's a switch is not going to significantly affect daily usage.The only more performant option (to my knowledge) would be the OWC Accelsior cards, which boast ~6,000Mb performance, but are over 5x's the cost of this card... But for average users at home (especially if you're not doing DAILY work with file sizes over ~60Gb), this card is the best choice, I think.we never needed tech support, as the card quality had no issues.

This is the ONLY card I have been able to get to work on my SuperMicro MBD-X10DRL-I-B LGA2011 server for multiple M.2 support. I have 4 of these in each VMWare 8.1 server each with 2 Samsung M.2 drives. I have 20 in my server environment with zero issues. I did read that some users had issues. This is a PCI 3 card for MBs that do not support Bifurcation. The M.2 installed must be NVMe and must be backward compatible with 3.0. If you use a 4.0 or 5.0 that is not backwards compatible you will not appreciate your result.

This item is a great idea, though one caveat is that it's a bit tricky loading 2 unit of m.2's that are equipped with a heat sink. The spacing between the two ports would be better if they were at least 1mm more than what they are. It's tricky mounting, but can be done. I bought 2 units, each with 2, 2TB for 2 different computers.If the mounting weren't so sketchy I would have given it 5 stars.

Bought 2 of these in the last few months. Both work great. I did notices that even though they look the same from the outside, the controller chip under the heatsink is not the same. No complaints though, they are both working like a champ.

So I ordered this card on a review by another user. I currently have the Ableconn PEXM2-130. This card is half the speed of the ablecon coming in at 1400/1450. Yes the ablecon runs hot, but it does not seem to affect its speed. Returning, what a disapointment. Below is. a screen shot with the Ableconn PEXM2-130

I bought one of these since my motherboard, a Gigabyte Gaming 5P rev 1, does not support bifurcation via BIOS unless you edit the actual code for the BIOS. The first one caused the computer to go into a constant reboot cycle before BIOS would even load. I tried it in different slots, used an eraser on the connection to see if that was the problem, and nothing worked.Before I could get a refund on it I was prompted to go through troubleshooting steps with a technician through Amazon. He agreed that the card was bad and instead of a refund made the call to send me a replacement one.I tried that replacement one today, and it did the exact same thing. I did all the troubleshooting steps and no good. This time I removed one of the SSDs from it and it would allow a boot with just one drive. The drives are Timetec 2tb NVME SSDs and this card is not compatible with two of them at the same time. The fact that this with one of them defeats the entire purpose of this card. I will refuse another exchange and will insist on a refund.

Worked perfectly -- easy way to add 2 NVMe storage devices into a system and not need to configure or have support for bifurcation. It's pricey, but I haven't found any other devices that can do this. All disks are bootable, so not sure what some reviewers are talking about. I can see the disks in the bios and can select to boot from them. Huge bonus is that the card has virtually all the ICs on one side, besides the plastic spring loaded pegs that supposed to secure the glue on heatsink, it is completely flat. I was able to get it in right next to waterblock on a GPU with very little clearance, so the 8x slot next to the GPU is now usable. All you really need is decent bios, nothing crazy, and this card works a treat.