EVGA seems to be the only brand to offer some custom GeForce GTX Titan Z cards at launch. The company offers three different versions; a regular Titan Z, the Titan Z Superclocked and the Titan Z Hydro Copper.
The regular version is the stock model, it features two GK110B GPUs clocked at 705MHz with a 876MHz Boost and 12GB GDDR5 memory clocked at 7000MHz. The Superclocked version has the same cooling solution but bumps the base clock to 732MHz and the Boost clock to 915MHz, and then there's also the Hydro Copper, a watercooled version with 758MHz base clock and 941MHz Boost.
The memory clockspeeds are the same as on the reference model.
GeForce® GTX™ TITAN Z is a gaming monster, built to power the most extreme gaming rigs on the planet. With a massive 5760 cores, 12 GB of 7 Gbps GDDR5 memory, and the most advanced power delivery system, GTX TITAN Z offers truly insane performance. It's easily the fastest graphics card we've ever made.
GTX TITAN Z is designed with the highest-grade components to deliver the best experience – incredible speed and cool, quiet performance—all in a stunningly crafted aluminum case.
The groundbreaking dual-GPU GTX TITAN Z uses new dynamic power balancing technology that ensures peak performance across two GPUs with optimal power delivery. This means you can game on multi-monitor displays and hyper PCs at high setting and super-fast frame rates. With support for NVIDIA SLI®, you can even add a second card and immerse yourself in graphically intense games like Watch Dogs® in full 4K Surround.