Hello together,
I've installed a new gpu (Nvidia GTX 950) with the latest nvidia drivers 364.72 (64bit) but BOINC does not found it. I don't get a clue on it. I already re-installed the drivers and BOINC with no success.
Any ideas?

Kind regards,
Sebastian

Here is the log:
04.04.2016 12:30:08 | | cc_config.xml not found - using defaults
04.04.2016 12:30:08 | | Starting BOINC client version 7.6.22 for windows_x86_64
04.04.2016 12:30:08 | | log flags: file_xfer, sched_ops, task
04.04.2016 12:30:08 | | Libraries: libcurl/7.45.0 OpenSSL/1.0.2d zlib/1.2.8
04.04.2016 12:30:08 | | Data directory: C:\ProgramData\BOINC
04.04.2016 12:30:08 | | Running under account Administrator
04.04.2016 12:30:15 | | GPU detection failed. error code -1073740940
04.04.2016 12:30:15 | | No usable GPUs found
04.04.2016 12:30:15 | | Host name: HDD3-PC
04.04.2016 12:30:15 | | Processor: 4 GenuineIntel Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz [Family 6 Model 58 Stepping 9]
04.04.2016 12:30:15 | | Processor features: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss htt tm pni ssse3 cx16 sse4_1 sse4_2 popcnt aes f16c rdrandsyscall nx lm avx vmx smx tm2 pbe fsgsbase smep
04.04.2016 12:30:15 | | OS: Microsoft Windows 7: Professional x64 Edition, Service Pack 1, (06.01.7601.00)
04.04.2016 12:30:15 | | Memory: 3.96 GB physical, 7.91 GB virtual
04.04.2016 12:30:15 | | Disk: 453.96 GB total, 377.15 GB free
04.04.2016 12:30:15 | | Local time is UTC +2 hours
04.04.2016 12:30:15 | SETI@home | URL http://setiathome.berkeley.edu/; Computer ID 7529095; resource share 100
04.04.2016 12:30:20 | SETI@home | General prefs: from SETI@home (last modified 10-Jun-2009 13:32:15)
04.04.2016 12:30:20 | SETI@home | Host location: none
04.04.2016 12:30:20 | SETI@home | General prefs: using your defaults
04.04.2016 12:30:20 | | Preferences:
04.04.2016 12:30:20 | | max memory usage when active: 2025.28MB
04.04.2016 12:30:20 | | max memory usage when idle: 3645.50MB
04.04.2016 12:30:20 | | max disk usage: 100.00GB
04.04.2016 12:30:20 | | suspend work if non-BOINC CPU load exceeds 25%
04.04.2016 12:30:20 | | (to change preferences, visit a project web site or select Preferences in the Manager)
04.04.2016 13:23:14 | SETI@home | Message from task: 0
04.04.2016 13:23:14 | SETI@home | Computation for task 02no10ab.2497.396958.7.34.23_1 finished
04.04.2016 13:23:14 | SETI@home | Starting task 01jl10ac.19616.292430.12.39.99_1
04.04.2016 13:23:16 | SETI@home | Started upload of 02no10ab.2497.396958.7.34.23_1_0
04.04.2016 13:23:21 | SETI@home | Finished upload of 02no10ab.2497.396958.7.34.23_1_0
04.04.2016 13:25:01 | SETI@home | Message from task: 0
04.04.2016 13:25:01 | SETI@home | Computation for task 02no10ab.2497.396958.7.34.148_0 finished

I've installed a new gpu (Nvidia GTX 950) with the latest nvidia drivers 364.72 (64bit) but BOINC does not found it.

You say a new GPU, so are we to believe you had another GPU before this one?
If so, did you uninstall the drivers for it?

If you never had a GPGPU in this system before -I specify a General Purpose GPU, because all computers have a graphics processing unit, as else you don't see anything on the monitor- what was your previous videocard?

Is it possible you need to change an option in the BIOS or on the motherboard to allow for the use of a different GPU?

Or is it possible you need to install (updated) motherboard chipset drivers?
Have you tried to fully uninstall previous videocard drivers, before you install the Nvidia drivers? Especially if the previous videocard was of a different brand, you best clean out the drivers for it before installing the Nvidia drivers.

04.04.2016 12:30:15 | | GPU detection failed. error code -1073740940
04.04.2016 12:30:15 | | No usable GPUs found

Error code -1073740940 (0xc0000374) means that a heap corruption occurred within the program. It can point to a problem with the compiler used for the drivers, or with the hardware itself. If not the GPU, possibly the motherboard it's stuck in. If possible try the card in a different slot on the motherboard, or if that's not an option, in a different computer.

Check that you added the power connectors to the card (one way easy thing to make sure the card doesn't show up...)
How heavy (Watt) is the Power Supply Unit you use in that machine?

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Dear Jord,
Thanks for the swift reply.
The computer is a DELL Workstation (Optiplex 7010) at the office, with an onboard intel graphic card (which was used before).
The Asus GTX 950 is only powered over the PCIe slot, the card does not need nor have an additional power supply (75W edition).
I've run a load test with 3D Mark 11 to test the card, so far everything is running fine. The BIOS and chipset drivers were updated as well.

Kind regards,
Sebastian

The computer is a DELL Workstation (Optiplex 7010) at the office, with an onboard intel graphic card (which was used before).

Did you uninstall its drivers?
You might want to run Display Driver Uninstaller, in Windows Safe Mode, to make sure all remnants of it are gone.

Driver (remnants) of GPUs no longer in use have proved to wreak havoc for the detection of GPUs in BOINC before, so please do make sure it's fully disabled and has its drivers removed.

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Thanks for the hint with the tool...
I used it now and found some driver junk remaining (Intel and AMD radeon)... never had a AMD GPU installed.
I cleaned it up and what should I say, it's working now. THANKS!

05.04.2016 13:00:04 | | cc_config.xml not found - using defaults
05.04.2016 13:00:04 | | Starting BOINC client version 7.6.22 for windows_x86_64
05.04.2016 13:00:04 | | log flags: file_xfer, sched_ops, task
05.04.2016 13:00:04 | | Libraries: libcurl/7.45.0 OpenSSL/1.0.2d zlib/1.2.8
05.04.2016 13:00:04 | | Data directory: C:\ProgramData\BOINC
05.04.2016 13:00:04 | | Running under account Administrator
05.04.2016 13:00:07 | | CUDA: NVIDIA GPU 0: GeForce GTX 950 (driver version 364.72, CUDA version 8.0, compute capability 5.2, 2048MB, 1904MB available, 1828 GFLOPS peak)
05.04.2016 13:00:07 | | OpenCL: NVIDIA GPU 0: GeForce GTX 950 (driver version 364.72, device version OpenCL 1.2 CUDA, 2048MB, 1904MB available, 1828 GFLOPS peak)
05.04.2016 13:00:07 | | Host name: HDD3-PC
05.04.2016 13:00:07 | | Processor: 4 GenuineIntel Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz [Family 6 Model 58 Stepping 9]
05.04.2016 13:00:07 | | Processor features: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss htt tm pni ssse3 cx16 sse4_1 sse4_2 popcnt aes f16c rdrandsyscall nx lm avx vmx smx tm2 pbe fsgsbase smep
05.04.2016 13:00:07 | | OS: Microsoft Windows 7: Professional x64 Edition, Service Pack 1, (06.01.7601.00)
05.04.2016 13:00:07 | | Memory: 3.96 GB physical, 7.91 GB virtual
05.04.2016 13:00:07 | | Disk: 453.96 GB total, 374.02 GB free
05.04.2016 13:00:07 | | Local time is UTC +2 hours

I used the Display Driver Uninstaller and it removed all display drivers.
I reloaded 361 for Nvidia and now BOINC shows 2 GPU's active.

I upgraded to 364 because it is the latest and it works too.

4/10/2016 5:32:20 PM | | CUDA: NVIDIA GPU 0: GeForce GTX 750 Ti (driver version 364.72, CUDA version 8.0, compute capability 5.0, 2048MB, 1668MB available, 1606 GFLOPS peak)
4/10/2016 5:32:20 PM | | CUDA: NVIDIA GPU 1: GeForce GTX 550 Ti (driver version 364.72, CUDA version 8.0, compute capability 2.1, 1024MB, 816MB available, 691 GFLOPS peak)
4/10/2016 5:32:20 PM | | OpenCL: NVIDIA GPU 0: GeForce GTX 750 Ti (driver version 364.72, device version OpenCL 1.2 CUDA, 2048MB, 1668MB available, 1606 GFLOPS peak)
4/10/2016 5:32:20 PM | | OpenCL: NVIDIA GPU 1: GeForce GTX 550 Ti (driver version 364.72, device version OpenCL 1.1 CUDA, 1024MB, 816MB available, 691 GFLOPS peak)

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Crunching for SCIENCE not CREDITS.