Yub yub, Checked the poll and looks like we are in. I've placed in on the calendar.

From the PrimeGrid Forums

Taken from the PrimeGrid forums. http://www.primegrid.com/forum_thread.php?id=4760

A Cautionary Reminder

ATTENTION: The primality programs Genefx64 (CPU) and GeneferCUDA (GPU) are both computationally intensive; so, it is vital to have a stable system with good cooling. They do not tolerate "even the slightest of errors." Please see this post for more details on how you can "stress test" your CPU, and please see this post for tips on running GFN on your GPU successfully.

As with all number crunching, excessive heat can potentially cause permanent hardware failure. Please ensure your cooling system is sufficient.

If you have never run GeneferCUDA before, please read these tips. GeneferCUDA stresses a GPU more than any other program I've seen and is incredibly intolerant of overclocking. It is strongly suggested that you run at least one (Short) Work Unit before the challenge to make sure your computer can handle it. Note that "Overclocking" includes GPUs that come overclocked from the factory, and lowering clock rates to the reference speeds is sometimes necessary. In the case of one particular GPU, the GTX 550 Ti, lowering the memory clock below the reference speed is often necessary.

WU's will take ~12 hours on a GTX 580 GPU and about 2 to 3 days on the fastest CPU core. A GTX 680 will be slower than a GTX 580 for this application. On my computer (GTX 460 & C2D Q6600), which is more of an "average" computer and certainly not the fastest, a Work Unit takes about 24 hours on the GPU and 6 to 8 days on the CPU.

If your CPU is highly overclocked, please consider "stress testing" it. Overclocking your GPU not recommended at all for GeneferCUDA. Sieving is an excellent alternative for computers that are not able to run Genefer.

Please, please, please make sure your machines are up to the task.