Out of the box the the Phantom GTX 760 from Gainward has a clock speed of 1072MHz base and 1137MHz boost up from Nvidia reference speeds of 980MHz base and 1085MHz boost. The memory is slightly overclocked to 6200MHz, that’s compared to the reference 6008MHz. This means about a 9% overclock on the GPU in addition to a tiny 1% on the memory. That said we can expect Gainward’s implementation of the GTX 760 to be about 10% faster than a reference GTX 760 if the overclock is anything to go by.
Gainward GTX 760 Phantom 2GB Graphics Card Review – eTeknix