But you have to use cables with X1 Male and X16 Female. If not , the Card will not function properly. (Im not sure, correct me if im Wrong)
Because you asked
See normal 1x to 1x extender:
https://cablesaurus.com/index.php?main_page=product_info&cPath=1&products_id=8
Versus 1x 'to 16x' extender (the socket is simply modified to allow the 16x card to seat):
https://cablesaurus.com/index.php?main_page=product_info&cPath=1&products_id=10
All the important stuff happens at the head end of the connector, the rest of the pins in 4x, 8x or 16x just enable greater bandwidth.
In short, don't overpay for a 1x to full-length 16x adapter that fully seats your card; the extra pins aren't connected to anything, and your 16x card will work perfectly fine connected to only 1x pins.
[note] no affiliation with cablesaurus, just links I had handy
