Is anyone using one of these USB3 20 pin header to x2 USB3 socket adaptors in an ASUS P8Z68 or P8P67 series motherboard:

And if so, can you tell me if it will clear a long graphics card in slot 2?

Examination of various Googled images suggest that it will - but only just.

If not, Silverstone have brought out a flexible cable that does the same thing but it looks expensive and doesn't seem to be available yet.