It isn't.

The Palit twin fan (part # with 10CB in it) is the same PCB design as the Gainward/MSI non reference cards (AFAIK). EK has the FC580 GW block for those.

If you can find a single fan (p/n with 09CB in it) then the GTX+ will fit.

I ended up selling my unused Palit and getting a BFG card instead.

(Palit also put warranty stickers over the screws - BFG and Zotac do not).

If it has a DisplayPort connector on it, it isn't a reference card. Reference cards have two DVI and one mini-HDMI only.

HTH
J