Here's a resource that might help when sorting out the various quirks of Apple SSDs and the machines that run them: A shame that little 2015 MBPro crushed the 8 core 2013 Mac Pro but that's the way it is.I still have 8 core to over ride so that's worth something to keep hold of.good luck But.the write & Read speed was capped off as Gt/sec =5 and PCl=2 and when I swapped in that Samsung in my mid 2015 MBPro then it showed 4 lane, Trim=YES and Gt/sec =8 and write speed went from 1224 to 2508 and read speed 1438 to 3119. BUT.when I swapped out both of these SSD with a Samsung NVMe 970 in either machine it was 4 lane and trim=YES. AND.the SSD from the late 2013 MBPro showed only two lane in the 2013 Mac Pro. I can't really help because I don't have the hardware but when I did swap out the SSD in a late 2013 rMBPro with the 2013 Mac Pro SSD the 4 lane default SSD from the Mac Pro only showed 2 lane in the late 2013 MBPro. The only thing I can say about this stuff is its much better NVMe wise on a Mac 2015 or later if the hardware can be addressed. Although I've learned to accept what I have currently because its better than what I had when I first bought this machine. Both these make world of difference in speed. I'm stuck at PVl 2 not 3 and Gt/sec =5 not 8. I do use a Samsung 970 NVMe with the Sintech adaptor or my 2013 Mac Pro. I use to have the early 2008 Mac Pro and I ran 6 internal drives with an internal blu ray optical, three SSD and three platter drives. Nice writeup but unfortunately I gave up on the older technology a few years back. If you're still here, thanks for bearing with me! Tl dr: Are there any faster solutions than the options listed above for a boot drive in a Mac Pro 3,1 (Early 2008)? I'm awaiting a quote for the Gen 3 model that fits two M.2 SSD blades. They are also quite expensive the Gen 2 model that fits four M.2 SSD blades has been quoted at nearly $300. When striping up to 4 SM951's they've reached pretty insane speeds. They are reportedly able to negotiate PCIe 2.0 speeds even with PCIe 3.0 drives in the 3,1's x16 slot 2. Amfeltech Squid: This company offers PCIe adapter cards with mounts for either two or four M.2 SSDs, using x16 or x8 PCIe connectors.As far as I can tell, this appears to be the only PCIe 2.0 x4 that Apple has ever offered.
1TB Apple OEM SSUAX (PCIe 2.0 x4): Sequential Read/Write: ~1200MB/s.512GB Samsung XP941 (PCIe 2.0 x4): Sequential Read: 1170MB/s, Write: 930 MB/s, though this test posts much slower speeds (~$330 on eBay):.So far, it appears that the only faster options are: I'm happy with it, for now.but ultimately, my intent is to find the practical speed limit for a boot drive on this machine. The experience is pretty great, with boot times under 15 seconds and really snappy load times in macOS High Sierra. Tl dr: Has anyone tried an Apple OEM SSUBX (PCIe 3.0 x4) SSD in the PCIe 2.0 x16 Slot 2 of a Mac Pro 3,1 (Early 2008)? Does it negotiate PCIe 2.0 link speed (5GT/s) or does it behave like a non-Apple AHCI SM951 and default to PCIe 1.0 (2.5GT/s) in the x16 slot?īefore I tried the SM951, I'd been using a 256GB Apple OEM SSUAX (PCIe 2.0 x2) drive in Slot 2, and getting 5GT/s link speed for a practical sequential read/write benchmark of 940MB/s read & 785MB/s write. Now, I haven't tried an official Apple version of the SM951 (the PCIe 3.0 x4 "SSUBX" SSDs with the proprietary 12+16 Pin connector), but I suspect that my results would be the same, since it's essentially the same drive as the one I tried, just with a different connector? Or would the custom Apple firmware somehow allow the 3,1 to negotiate PCIe 2.0 link speed in the x16 slot with the PCIe 3.0 drive? Mac Pro 4,1 and 5,1 owners can just use the x4 Slot 3 or Slot 4, which lets their PCIe 3.0 SM951s operate at PCIe 2.0 speeds (5GT/s), but the x4 Slot 3 and Slot 4 in the 3,1 is already only PCIe 1.0, and therefore limited to the 2.5GT/s link speed. Due to a quirk with these Mac Pro motherboards (3,1 - 5,1), when a PCIe 3.0 x4 SSD (like the SM951) is connected to the x16 slot, it defaults to PCIe 1.0 link speed (2.5GT/s), instead of the PCIe 2.0 (5GT/s) link speed of which it is capable. I recently purchased a 256GB AHCI Samsung SM951 (PCIe 3.0 x4) connected it to a Sintech M.2(NGFF) M Key PCI-e SSD to PCIe X4 Adapter Card, and dropped it into Slot 2. I have a Mac Pro 3,1 (Early 2008) running macOS High Sierra (dosdude1 patched), the one with two PCIe 2.0 x16 slots (the double-width Slot 1, occupied by graphics card, and the single-width Slot 2) and two PCIe 1.0 x4 slots (Slot 3 & Slot 4). Forgive me if this is addressed elsewhere, but I haven't been able to find any other threads with my specific query.
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