You can immediately tell the slight performance boost the out-of-the-box factory overclock gives you.

It's easy to assume from that the Zotac is the faster card but, while that is true at stock settings, the Asus card will easily outstrip the Zotac when you start waving the overclocking stick around.

DirectX 11 tessellation performance

Zotac gtx 560 ti 448 cores le

DirectX 11 gaming performance

Zotac gtx 560 ti 448 cores le

Zotac gtx 560 ti 448 cores le