But only on Slot #2
Slot 3 or 4 worked perfectly.
Happened recently also with a Samsung EVO 960 1TB
750MB/s read and write on Slot 2 and 1550MB/S read and write on slot 3 - 4
1) Slot 3 and 4 use a different PCIe controller than Slot 1 and 2.
# Set Target Link Speed of MacPro3,1 slot 2 root port to 5GT/s
sudo setpci -s 00:1 CAP_EXP+30.w=2:F
Apparently the writer of that article has never heard of TRIM. The advice in the article is very, very bad.
Remove 2 dimms might be able to solve your current problem, 48gb instead of 64gb. And for benchmark try Xbench instead of AJA.
I've received 4 Samsung 960 Pro 1TB SSDs and did some tests to confirm that 5 GT/s x16 works in the 2008 Mac Pro.
-[0000:00]-+-00.0 Intel Corporation 5400 Chipset Memory Controller Hub [8086:4003]
+-01.0-[01]--+-00.0 NVIDIA Corporation GK104 [GeForce GTX 680] [10de:1180]
| \-00.1 NVIDIA Corporation GK104 HDMI Audio Controller [10de:0e0a]
+-05.0-[02-07]----00.0-[03-07]--+-08.0-[04]----00.0 Samsung Electronics Co Ltd NVMe SSD Controller SM961/PM961 [144d:a804]
| +-09.0-[05]----00.0 Samsung Electronics Co Ltd NVMe SSD Controller SM961/PM961 [144d:a804]
| +-0a.0-[06]----00.0 Samsung Electronics Co Ltd NVMe SSD Controller SM961/PM961 [144d:a804]
| \-0b.0-[07]----00.0 Samsung Electronics Co Ltd NVMe SSD Controller SM961/PM961 [144d:a804]# Set Target Link Speed to 2.5GT/s of MacPro3,1 slot 1 root port
speed=2
rootport=00:5
linkstatus=$(sudo setpci -s $rootport CAP_EXP+12.w); echo '# Before: PCIe' $(( 0x$linkstatus & 15)).0 x$(( 0x$linkstatus >> 4 & 31))
sudo setpci -s $rootport CAP_EXP+30.w=$speed:F # Set Link Speed
sudo setpci -s $rootport CAP_EXP+10.w=20:20 # Start Retrain
linkstatus=$(sudo setpci -s $rootport CAP_EXP+12.w); echo '# After: PCIe' $(( 0x$linkstatus & 15)).0 x$(( 0x$linkstatus >> 4 & 31))If the 2012 Mac Pro boots with the gen 3 amfeltec card set to gen 1 speed then you need to use the command to get gen 2 speed. I suppose a kernel extension would be preferable, or a EFI patch which can affect all OSs that you choose to run on the Mac (macOS, Linux, Windows).
Sonnet states the Sonnet Echo Express SE III is Mac compatible, so it doesn't need the Thunderbolt 3 enabler patch.
gen 2 is for recommended for Mac because the Mac pros are pci-e 2.0 and you will get better performance using Squid PCI Express Gen 2 Carrier Board on a Mac pro but if you have a hackintosh that use pci-e 3.0 then you get the maximum speed using Squid PCI Express Gen 3 Carrier Board
good question , I know you didn't asked me but I found out about this, some cards do requiere a compatible motherboard that supports that option "bifurcation" 4x4x4x4x = 16X ,but if I'm not mistaken and I understood things correctly there are some card that doesn't need or requiere "bifurcation" because they have some special chip on the m.2 adapter board that takes care of that and it will see the card as a single 16x card, I can't confirmed this because I just read about it in some page but I will order my squid gen 3 tomorrow , then I will know for sure, I really like that card but man that green pub color is killing me but that card is the best option, is bootable on Mac OS , I have a hackintosh so gen 3 is the option for me but now the problem is High Sierra, I will only be able to raid using HFS+ that is if I want to use the card as bootable device, if I'm going to use the card as storage only then I can make the raid on APFS.
what I really like is the pcb color that is brown , while the squid gen 3 is green , I really will like a brown card but the ones that are brown do no work for Mac or hackintosh, they are windows only and some of them are not even bootable, they are storage only like the new good looking high point card, that one looks beautiful but no Mac support and they are storage only. I'm so upset haha
I guess you didn't read my later post #214 where I show that the Squid Gen 3 is faster than the Gen 2 for one SSD even when it runs at Gen 1 speed.
Macs don't support bifurcation.
The amfeltec cards use a PCI Express Switch chip. The lspci command shows that the Gen 3 card uses the following:
PCI bridge [0604] (class code): PLX Technology, Inc. PEX 8732 32-lane, 8-Port PCI Express Gen 3 (8.0 GT/s) Switch [10b5:8732] ([vendor id:device id]) (rev ca)yes most likely I missed that part, I don't know if the squid card supports windows on a PC because the lack of documentation in Amfeltec web site, but they do work on a hackintosh PC to install Mac OS, at this point I don't know if windows is supported. another important part that is missing is how high can the card really go, let's just say with 4 samsung pro or evo, no info is available either, the problem that I have is with the 4th m.2 disk , I have no where to install it because I have a Nvidia 1080 card but with just 3 regular 4x pci-e cards I get over 8,000 in read speed and over 4,000 in write , don't remember the actual number right now, that's why I need a 16x card but I'm not going to pay 580 including shipping and PayPal expenses if the card can only go up t 8000 or 9000, the high point card is certified to reach at least up to 12,000 or even a little bit more depending on what drives are installed, keep in mind that you need a powerful CPU to be able to push the card and the M.2 drive to archive the maximum speed. the only problem with the high point card is that it doesn't support Mac OS, if anybody has any info about if the squid card can go over 10,000 please , I will appreciate, thank you
I'm using High Sierra. I use pciutils from https://github.com/pciutils/pciutils
cd ~/Downloads/pciutils-master
sudo make installsudo update-pciids
sudo nvram boot-args="debug=0x144"sudo lspci -nnvtchmod 744 pcitree.shsudo pcitree.shWindows has drivers for PCI switches, SATA drives, and NVMe drives. The amfeltec card does nothing special. I'm not sure there's a way that it couldn't be supported in Windows...
You need to reread my post a third time. It includes a test where I got over 11GB/s in macOS using an x16 slot in a Hackintosh. The Hackintosh I used only has one x16 slot. You need to check with your motherboard documentation for the options available to you. The benchmark and OS I used may produce different results than the benchmark and OS used for that High Point card. The point is that you can achieve greater than the maximum theoretical performance of a PCIe 3.0 x8 slot (or a PCIe 2.0 x16) slot when you use a PCIe 3.0 x16 slot.
I've emailed rob-ART to update/correct those articles with the information from my tests. To reiterate, the problem with the gen 3 card in the Mac Pro is that the upstream port starts up at gen 1 speed instead of gen 2 speed. The down stream ports start up correctly at gen 3 speed, making the gen 3 card faster than the gen 2 card anyway for individual M.2 devices. You can set the gen 3 card's upstream port to gen 2 speed after startup. You could create some code to do that in EFI, so it works with any OS, before the OS starts.
I only read the post where you replied to me, but now I will read that post that you mentioned, thanks
The first two Barefeats articles used 512 MB SM951 AHCI M.2 drives.
For my tests, I used four 1TB 960 Pro NVMe drivers as stated in my first tests in #212 using Apple Raid (Disk Utility.app). The updated tests in #214 used SoftRaid which gave much better results.
I was quoted $465.00 USD + $59.66 USD taxes for the card SKU-086-34 (I'm in Canada) on Oct 2. The card is expensive because of the PEX 8732 switch chip (about $170) I'm not sure what the other $300 is for. Cards that require PCIe bifurcation don't use a switch chip (they use the motherboard's switching capabilities for the slot) and are therefore much less expensive ($200?).