The E-Zone sample has the same clocks we saw in ASUS press release. The base clock of 706 MHz and boost clock of 876 MHz. However, it does not really matter. These numbers have nothing to do with the clocks you would be getting in real-world scenario. In fact the clock speeds ramp up to 1058 MHz! And regardless how crazy it may sound, it was partially the reason why it was delayed. If the card boost more than 300 MHz and yet offers worse or similar performance than Radeon R9 295X2, then NV has a serious problem (well it’s not something you expect from $3000 graphics card).
Driver issues we were told about, are not only related to the noise, temperature or any hardware malfunction that would cause the delay. The real issue is performance, TITAN Z is simply not fast enough to beat the Radeon R9 295X2