Startech made one.
https://www.startech.com/en-us/cards-adapters/pcix1pex4

cyclone3d wrote on 2025-11-20, 17:41:

Startech made one.
https://www.startech.com/en-us/cards-adapters/pcix1pex4

Yes, but the link days Discontinued

I found https://www.tamayatech.com/parts.php?g=PCIX1PEX4 which are more than I wish to pay

As far as I know, Startech was the only company to actually make that type of adapter.

You could always do a PCI-X SATA adapter and a SATA to NVMe adapter, but the fastest I am seeing is SATA Ii.

Then there is the option to do a fiber card and a drive shelf but that would be super expensive.

I was looking up stuff some more and it looks like the best you are going to get over PCI-X is either SATA II or SAS.

With RAID 0, you should be able to max out PCI-X.

Thinking about it, I wonder if NVMe would even work on a board with PCI-X. It most certainly would not be bootable unless you have a hardware RAID card.

cyclone3d wrote on 2025-11-20, 18:21:

As far as I know, Startech was the only company to actually make that type of adapter.

You could always do a PCI-X SATA adapter and a SATA to NVMe adapter, but the fastest I am seeing is SATA Ii.

Then there is the option to do a fiber card and a drive shelf but that would be super expensive.

I know there are m2 to sata adapters but the ones I’ve seen only work if your m2 device is a sata device, not nvme. And there are m2 pcie to sata adapters that are just tiny sata cards that let you plug sata drives into an m2 slot pcie slot.

Can you show me a device that lets you plug an nvme into a sata port? I’d love to see it.

douglar wrote on 2025-11-21, 01:02:

cyclone3d wrote on 2025-11-20, 18:21:

As far as I know, Startech was the only company to actually make that type of adapter.

You could always do a PCI-X SATA adapter and a SATA to NVMe adapter, but the fastest I am seeing is SATA Ii.

Then there is the option to do a fiber card and a drive shelf but that would be super expensive.

I know there are m2 to sata adapters but the ones I’ve seen only work if your m2 device is a sata device, not nvme. And there are m2 pcie to sata adapters that are just tiny sata cards that let you plug sata drives into an m2 slot pcie slot.

Can you show me a device that lets you plug an nvme into a sata port? I’d love to see it.

I saw some listings that said nvme to sata but it turns out those have separate connections for sata and nvme... bleh. I thought somebody finally came out with one that actually had a converter chip on it.

cyclone3d wrote on 2025-11-21, 04:39:

I saw some listings that said nvme to sata but it turns out those have separate connections for sata and nvme... bleh. I thought somebody finally came out with one that actually had a converter chip on it.

It’s a tough ask to build something like that because sata and nvme interact very differently. The benefit of the nvme is very low latency with massive parallelism over pcie. Sata talks Ahci which has its roots in ATA UDMA which in turn still has similarities with an old Wd1003 from 1983. If you build a device to translate ahci calls to nvme command packets, you lose the low latency and the parallelism. At best you end up with an average sata device. You probably end up with a very slow sata device. We are better off just using native sata devices with sata controllers until such a time that nvme gets faster and sata more expensive to the point that emulation starts to makes sense.

Edit I guess the tri-mode hba devices that make nvme’s look like sas devices sort of fit that bill, but those are some expensive kit just for backwards compatibility. Using Nvme to emulate Sas is possible but not really recommended. They recommend using nvme devices as nvme storage.

https://www.broadcom.com/products/storage/hos … as-nvme-9500-8i