Have you read this mixed review? Maybe worth trying…
I’ve not tried PCIe to PCI a adapter for an audio card myself, but I tried a PCI to printer port adapter for a Motu midi router last year & never could get it to work. No biggie, I just used the midi outs of the Motu to my sound cards midi in.
Considering future continued use of my own Aardvark audio cards, which won’t work with any OS beyond 32 bit XP anyway, as long as I keep using them I must stick with that. I may as well stay with legacy motherboards with the proper PCI slots too while I’m at it… not a problem using my work-around method of externalizing to beat the XP ram limit, therefore making a 64 bit system unnecessary. It’s a matter of my own priority.