nvidia launches tesla k40, overview by Ryan Smith.

Ignoring reality (the hiked up $5500 off the shelf price tag), the design expands potential; Boost is 19.5% faster than a K20 (no boost), it has twice the memory (12GB), faster GDDR, an additional 192 shaders and with the help of the new B1 stepping and binning, it's still a 235W model.
The performance boost in apps over the K20 seems to range from 11% to 25% but could be as high as 28%. The K40 is PCIE3 (unlike the K20 which is PCIE2). This eliminates some bottlenecks for some applications, but unless it scales much better on the newer Xeon processors there is still going to be some drop off.
Obviously the 5TFlops GTX780Ti is the best card for here, but the K40 offers versatility at a high performance level and opens up more R&D avenues.
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Since the K40 is significantly lower clocked than GTX780Ti, it's no wonder it's "only" got a 235 W TDP.. considering GTX780Ti has a 250 W TDP. Aprart from the additional memory and it being ECC (which can mean the world to some) the feature that really sets these cards apart is the massive FP64 performance.

MrS
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Scanning for our furry friends since Jan 2002

Yes, when you compare the K40 to a 780Ti (the best GPU for here), but when you compare the K40 to its predecessor (the K20) what's noteworthy is that it's PCIE3 complaint, the potential performance improvement is 28%, and what's outstanding is the 12GB GDDR5 (Rendering, Fluid Dynamics and Seismic Analysis...). Considering the GPGPU has more cuda cores, is clocked higher, has Boost, faster RAM and twice the amount of RAM, being able to stick to the 235W TDP is very nice, and for business/research this is very important - it's a potential upgrade.
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It is bad
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My GTX660Ti does ~320k RAC, had even reached 330k. And that's under Win 8.1, i.e. without XP/Linux speed boost.

MrS
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Scanning for our furry friends since Jan 2002

Stop running Short tasks and just run Long tasks. The credit/h is higher.
It will take time for your RAC to rise. Going by the runtime of your last Long task, if your computer is on 24/7 your potential RAC is about 1.6Million/day. However, I suspect a better configuration could improve that to somewhere between 1.8M/day to 2M/day. Running short tasks it's would only be about 700K/day.

I suggest you stop running CPU tasks on that system, and just run GPU work. Use software such as MSI Afterburner to set the fan high enough to prevent the cards from getting too hot. Check that your GPU clocks don't fall.

I see that several tasks failed or were Abandoned (presumably when you changed OS). Odd that the GPU's are failing when the temp is only 62C.

Suggested reading,
FAQ - Best configurations for GPUGRID
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You can set it in your GPU-Grid settings in "my account", for each venue separately if needed. You can assign hosts to venues in the host details under "my computers".

(I'm assuming you're familiar with how this owrks under pretty much all BOINC projects, if not I/we could be more specific)

MrS
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Scanning for our furry friends since Jan 2002

yes, 12Gb and 64fp performance is hard to replace for some tasks.
I was very happy they released a 1k$ 6gb card a few months ago, as even current 3gb 780ti is significantly slower for my tasks due to a lot of memory swapping between GPU and system.

12Gb would be even better, but I can not justify 5k$ just yet :)

a new BLAS GPU library that automatically scales performance across up to eight GPUs in a single node, delivering over nine teraflops of double precision performance per node, and supporting larger workloads than ever before (up to 512GB). The re-designed FFT GPU library scales up to 2 GPUs in a single node, allowing larger transform sizes and higher throughput.

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