CUDA+MPI Device

I have 4 PC ,their OS: Windows HPC Server 2008(x64) , Hardware : Tesla C1060 +Quadro NVS 295
compile tool : Visual Studio 2008 C++ with MSMPI library .

When I get some message that run cuda program only one PC :

Number of CUDA Device : 2

== Device 0 ==
Device name : Tesla C1060
Device global memory : -262144

== Device 1 ==
Device name : Quadro NVS 295
Device global memory : 268107776

Q1 : Why the Tesla C1060 memory is -262144 !? :confused:
Is not Tesla C1060 memory 4g ?

When I get some message that run cuda + MPI program on 4 PC :

Number of CUDA Device : 1

== Devive 0 ==
Device name : Device Emulation (CPU)
Device global memory : -1

Q2 : Why get the device only one and why device memory is -1 ? :confused:

By the way…my Tesla C1060 driver software is Vista x64 because I could not fount the driver for Windows HPC Server 2008. Is the driver reason !?

Quadro NVS 295 has two driver : Quadro Graphics & Quadro Performance. How about both differentiate !?

And sometimes run cuda+mpi program, I get error message : cuda.cu code line393 : no CUDA-capable device is available.
What happen !? or sometimes program state always runnung…