[anfractuosity]

Out of interest, would you get a similar bandwidth using DDRx on this card over PCIe, to using DDRx in the standard memory sockets on a motherboard

Edit: Looks like the slowest DDR4 gives 19200 MB/s https://uk.crucial.com/support/memory-speeds-compatability

Not sure what PCIe that card supports is though

[theandrewbailey]

Looks like the card is PCIe 4.0 x4, which gives about 8GB/s. Not sure if this board is driving the RAM at full speed, or how many controllers there are, but more lanes could make this faster.

[BizarroLand]

Looks like one controller per lane, so if this 4x card finds a good market we might be looking at 8x or 16x siblings in the future.

This isn't a good device for most home users, but for businesses that cache a lot of high speed data this could be a useful tool.

[convolvatron]

I haven't kept up with the speed and feeds, but in general PCI bandwidth is a decimal order of magnitude less than all the memory controller bandwidth

[namibj]

A modern AMD Zen3 has more PCIe bandwidth than DDR4. With somewhat slow ram even if you measure half-duplex.