Im such a noob, I thought I needed barbs as well as compression fittings, just going with compression fittings.
Also, spoke to startech support they can ship to me and the adapter should work with the Xonar ST. I then found out that their adapter uses the same bridge that is used on the D2X so possibly the STX aswell.
ASUS equips the Xonar D2X with a Pericom P17C9X110 PCI-to-PCIe bridge. Due to the additional PCI-to-PCIe bridge, the Xonar D2X requires external power from a four-pin power connector. Performance of the Xonar D2X and D2 are identical. Internal ASUS testing has not revealed any performance shortcomings of using a PCI-to-PCIe bridge chip, Lai said.
Chipset ID Pericom - PI7C9X110BNBE
Actually the essence uses PEX 8112 chipset so gonna try find an adapter with that.
Found one: http://www.soarland.com/Bracket_PCI_To_PCI-E_1x_Riser_Card_Extender-product-257.html
Cant believe thats the same tech used on the STX.Edited by MaFi0s0 - 5/8/12 at 2:56pm