I tried two different MVMe blades, first an Adata SX8200 Pro 1TB and then a Samsung 970 Pro 1TB in the SYBA I/O Crest SI-PEX4012 controller. Both showed up and were bootable in a cMP 5,1 10.14.3. However, shortly after I would do a read or write to the I/O Crest my computer freezes and then reboots. This happened with BMD Speedtest and when copying or writing to/from the I/O Crest from other drives.
I first tried the Adata, which is the newest version with the updated Silicon Motion controller. It is very fast and runs cooler than the earlier version. I rechecked again by removing the other cards in the PCIe slots leaving the new two bios Pulse 580 in slot 1 and the controller in slot 2. I did the SMC reset and pram zap and the new TTPro shows everything is O.K. for what thats worth.
I thought it might be compatibility with the Adata and tried the Samsung 970 Pro, but the same thing
happens with it. I then cloned a High Sierra partition from my work machine for that A/B and the same thing still happened. It runs fine from an OWC Excelsior PCIe SSD adapter. I was looping a large Pro Tools session for extended times today and it runs great.
I’m wondering of anyone else is running the I/O Crest SI-PEX4012 with the 2 bios Pulse 580. I’m trying to figure it out and thats one more variable. Any tips will be greatly appreciated.
I bit the bullet and got the I/O CREST SI-PEX40129 and dropped in a Samsung 970 Pro 1TB that I already had. I have the same symptoms that you do. This is a 2009 Mac Pro flashed to 5,1 and boot rom 141.0.0.0 with that card in slot 2, and an MVC flashed GTX Titan in slot 1. Copying a number of large files, it eventually hangs. Tested in both High Sierra and Mojave. After it freezes, a few seconds later it appears that a watchdog timer in the machine recognizes it has frozen and reboots the machine.
I could always make it hang by running Black Magic Speed test for maybe 5 minutes. When it was working, it was giving 2600+ MB/sec writes and 2900+ MB/sec reads.
I wasn't real happy with the build quality on the card. It uses thermal pads above the blades, but the heatsink is a little too close to the blade and was pushing down hard enough to bend it a bit.
That, and the included screws for the NVME standoff were the wrong size. Luckily I took a couple of screws out of an old Macbook, and they fit the standoff. They were also very sloppy in attaching the thermal pads to the heatsink.
As another person mentioned, fan noise was... meh. Nothing you would want to add into a sound studio though.
I am beginning to wonder if this card should be removed from the compatible list in the top post.