HTX PCI

While searching for low latency motherboards I ran across a white paper about a type of PCI called HTX that is geared toward low latency.

Does anyone know if this would be compatible with Mesa cards?

www.hypertransport.org/docs/uploads/HTX_White_Paper.pdf

These are not PCI but rather HyperTransport cards.
These have sub 5 nS latencies which are important
for high performance processing clusters or co-processors but
basically of no advantage for motion control and they have a big disadvantage:
Motherboards with HTX slots are pretty darned rare (and likely AMD only).

The sub microsecond latency of PCI/PCIE is fine for motion control