That's a lot of data fast, I can imagine how faster SSD and more memory would always help speed that along better! I bet it would take my system days or weeks to process one of those videos (Dual core, 8GB memory, single regular SSD )

@JackSted and @Lost_N_BIOS - revisiting back to the origial topic that started this post way back in the past:

I installed the IoCrest/NanoTech Twin M.2-Card which uses ASMedia 2824 PCIe Switch Chip onto the Z9PE-D8 WS Board.
The System falls into freeze also, just like the previously tested X79-E WS/Win7 System.

I have Win10 running on the Z9, so I suspect a general mismatch between the ASMedia Chip and the combination of X79/C602 Chipsets and/or IvyBridge-E/EP-CPUs.
Starting the performance test from Samsung Magician is enough to let the system fall into freeze immediately or better to say, in less than a second after initiating the test.
This behaviour is similar to that on the X79-Win10 Systems.
Interesting that I was able to write a small packet of data to the M.2 without the freeze to occur. A few Bytes or KB of text file could be written, but with larger amounts of data, the error occurs.

This was the reason for us to start thinking about finding/unlocking bitfurcation settings in the Bords' Bioses.
So the next step for me is to try out a real bitfurcation card with the Z9 system.
The Z9 has the bitfrucation settings unlocked by default, so I suspect less trouble when running a card that relies on bitfurcation.
To my surprise, the Asus Hyper M.2 ×16 cards have become rare and expensive on the marke, soI will try out the rather similar product by AsRock - the Ultra Quad Card.

The Asus Hyper M.2 ×16 card is 80 euro atm. the Asrock Ultra Quad M.2 Card 74,00 same site. I got it from a store that went belly up last week for 50 must have been cus they wanted to lose stock asap.

Unless you're installing to NVME it should be recognised in windows as a drive nonetheless even without bios mod/driver.

From my guide:
If BSOD's occur now and then when writing to PCIE setting BIOS > Advanced > System Agent Configuration > IOH Configuration > Gen3 Equalization Phase 2/3 WA + Equalization Phase 2/3 Supported + Gen3 Equalization Redoing WA.
Set all to enabled.
Changing this and also adding 0.010/0.015 vcore and changing VCCSA voltage to the same stock 1.05 VTT voltage seems to have fixed my instabillity(BSOD) problems.
Voltage part might not be neccesary for you because I also have a decent overclock going so the SystemAgent(IMC/PCIE controller) might not be stressed as much.
The extra power on the Asrock one should not be needed since the slot is good for at least 30W and 1 NVME drive uses 6W. (Although it might prevent my latter voltage karfuffel :? )

Good luck!

I was able to get the AsRock Ultra Quad for €67, but where I searched, the Asus is around €80 (or above) as you wrote.

The NVME is currently running unter windows, as before, no problem since I swapped it back to the standerd PCIe×4-M.2 Adaptor.
It appears as NVME controller and storage device in device manager, either if I mount it on the adaptor or the Dual (switched) M.2 Card.

When I mount it to the Dual M.2 card, its instances appear in the branch behind a pci bridge (the instance of the Asmedia 2824) in Device Manager or HWinfo. That's the only difference.
The standard M.2 adaptor does not appear as an instance/device there at all of course. Same should be with the Asus Hyper M.2 or ASrock Ultra Quad?

Some guys selling this Asmedia Card on the net stated that it upgraded their aged Mac Pros to use NVME, even gave them Nvme boot options. Maybe Apple supplied a new bios for their machines?
One hint is that one mentioned Mac Pro did not have PCIe Gen3 at all, but the use of the Dual M.2 card provided full bandwith for the attached Nvme drives.
I dont understand it completely, but it is suggested that the card provides one ×8 downstream and two ×8 upstreams. That is so that the PCIe Gen3 ×4 bandwith of one M.2 can be translated in to Gen2 ×8 signal for older boards/chipsets? *Shrug*
So I don't have a pure split/bitfurcation function on the Asmedia card, it can also provide a switch funtion, like the PLX chips on some mainboards, where two ×8 endpoints are rooted to one ×8 Slot(?)
I can only guess that at least the X79/C602 gets irritated by this behaviour, as it is the same on two mainboards and two different CPus (not very much different as ther're both Ivy Bridge E) and two different Versions of windows (7 and 10).


So when I have my second NVME SSD and it runs on the Ultra Quad, I'll install the win10 system there or mirror the current installation (could cause Boot-Up BSOD problems though). After I applied the Bios mod of course :)

The aforementioned system freeze (even no BSOD) occurs *only* when using the MNVE SSD on this card with ASmedia 2824, not when using a regular adaptor.
But I can look what happens when I set the Gen3 Equalization Phase 2/3 WA settings you recommended.

Yup looking at traces running directly from the m.2 slots to the pcie x16 connector the ASRock ULTRA QUAD M.2 card is basically other then some electrical stuff for a fan and the additional power a dumb riser card and probably shouldnt show up as a device.
The people using this or a simmilar card in mac pro's for system boot without NVME BIOS mod are probably using Samsung pro NVME's wich have an option rom like a raid card or network card on them.
For the Gen3 Equalization Phase and voltage bios settings, I'd go with the "If it aint broke dont fix it." motto.

Samsung 950 Series SSDs do have an additional boot rom onboard... I wonder why they omitted for the following series.
If I get along with the Asrock and my NVMEs I would not need to figure out what it's about this Dual M.2 switch chip card.
But if I'd get to run it on at least one system I'd be able to tell that it is functional at all and may not have a defect. So I could at least sell it afterwards.

Have you guys seen this product:

https://www.amazon.com/Supermicro-AOC-SL...d/dp/B071S3ZY8P

Cool, I have been looking up so much of that stuff I really don't know if I had seen that before or not ;)
But my worry is that these cards or risers are often designed to fit supermicro servers only. They have a huge stock of add-on cards, and risers and whatever, but a lot of them do work only on SM harware.
I will certainly take a look at this one as it would fit to populate the dedicated ×8 slots of the X79-boards.

Damn, when I look at it from amazon in germany, it costs more than I paid for the Asrock Ultra Quad.
Would I order it through amazon.com I'd have to add some import tax and higher postage fees.

But to get this SM Dual-Card for a more reasonable price would make it a great alternative for the ×8 slots!

Thats not true. I have sucessfully used a Supermicro Riser card m.2 split x8 card on my X99 and it works perfectly. Have read reports of some of their cards being proprietary but ymmv. Worked for me on another model. Mine was actually a x8 to x4x4 split pcie card. Worked for me.

I do use for a storage solution a PCIe V3.0 x16 add in card from High Point to plug 4 x M.2 NVMe SSDs

That is a controller, right? Maybe the 7101 or 7102?

I have an ASRock Ultra Quad in use on the Z9 board now.
I split the second CPUs Root Port2 in ×4×4×4×4. The stock bios offers this option already so I did not expect a problem there.
I placed my 970 evo on the second slot of the Ultra Quad Card to see if it gets recognized by the system.
And it is.
Interestingly that -according to HWInfo- the 970 is now located on PCIe Port 2C - whic is the third "slot" of the bitfurcated root port, and not the second one as I had expected.
I seems to me that the ports on the Ultra Quad Card are rooted kinda backwards by the system: the first port on the card seems to be located to PCIe slot 2D, while the second becomes slot 2C and so on.

Nice to see it working!
The reduced speed may be because of the massive heatsink reducing temperatures too much, NVME drives like a temperature of 35-60c. I would consider testing without it. Tho when populating all slots with M.2's heavy workloads might require the heatsink to prevent heat throtteling.
Good luck with the NVME flash.

I will unplug the cooler fan first - it's way too noisy for my taste. Mabe that should be enough?

I looked up the NVME-Mod-Bios you provided. This one comes as .bin file, is that ok? Or do I have to rename it to .rom if I want to flash it?
Which method should I use for flashing? I got the AFU-Tools, but I don't know if they're working. When I tried to start AfuWin.exe for testing, it reported "no driver present".
Do I have to look for a specific version of the AFU-Tools?

@JackSted; @Lost_N_BIOS - AfuWinx64 method does not work on the Z9 board, the tool reports "flash type is not supported"...