Hi,
I do a fresh install Windows 10 and after that Boinc 7.6.22. When I look boinc logs I saw 2 ATI GPU but I have only 1 real GPU. Look at belove

11/09/2016 19:08:51 | | CUDA: NVIDIA GPU 0: GeForce GTX 750 Ti (driver version 372.70, CUDA version 8.0, compute capability 5.0, 2048MB, 1689MB available, 1622 GFLOPS peak)
11/09/2016 19:08:51 | | OpenCL: NVIDIA GPU 0: GeForce GTX 750 Ti (driver version 372.70, device version OpenCL 1.2 CUDA, 2048MB, 1689MB available, 1622 GFLOPS peak)
11/09/2016 19:08:51 | | OpenCL: AMD/ATI GPU 0: Pitcairn (driver version 2117.13 (VM), device version OpenCL 1.2 AMD-APP (2117.13), 2048MB, 2048MB available, 1840 GFLOPS peak)
11/09/2016 19:08:51 | | OpenCL: AMD/ATI GPU 1: Pitcairn (driver version 2117.13 (VM), device version OpenCL 1.2 AMD-APP (2117.13), 2048MB, 2048MB available, 1840 GFLOPS peak)
11/09/2016 19:08:51 | | OpenCL CPU: Intel(R) Core(TM) i5-2500K CPU @ 3.30GHz (OpenCL driver vendor: Advanced Micro Devices, Inc., driver version 2117.13 (sse2,avx), device version OpenCL 1.2 AMD-APP (2117.13))
11/09/2016 19:08:51 | | OpenCL CPU: Intel(R) Core(TM) i5-2500K CPU @ 3.30GHz (OpenCL driver vendor: Advanced Micro Devices, Inc., driver version 2117.13 (sse2,avx), device version OpenCL 1.2 AMD-APP (2117.13))

How is that possible Boinc detected 1 more GPU ? When I try some projects like SETI, Collatz, Milkyway boinc start 2 wu at a time so GPU run %100 and windows become laggy as hell.

I try uninstall AMD driver, delete all with DDU application and re install again but nothing change. For my Nvidia GPU no problem.
Any suggestions about this ?

BOINC won't detect anything that isn't there. You say yourself, you remove the drivers and they get reinstalled, so that means something is there.

A built-in GPU on the motherboard, perhaps?
It's possible you have a dual AMD GPU on one card in there. I'd say, open up the case and do a count of the cards in there.

Or run something like GPU Caps Viewer or SIV to see what's in there.

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BOINC won't detect anything that isn't there. You say yourself, you remove the drivers and they get reinstalled, so that means something is there.

A built-in GPU on the motherboard, perhaps?
It's possible you have a dual AMD GPU on one card in there. I'd say, open up the case and do a count of the cards in there.

Or run something like GPU Caps Viewer or SIV to see what's in there.

I have one sapphire radeon R9 270x and one NVidia Geforce 750TI both have only one gpu circuit on plate so I have to see 1 ATI/AMD GPU at the Boinc log.

If you look the log you will see 2 ati gpu0 and gpu1 this is some kind of bug I think. I try to back old driver I hope its solved. If not 1 ati gpu seems like 2 and I have to continue crunch 2 wu at a time :( because when I try seti 2 wu start to crunch gpu %100 fan %80. No app_config at boinc also.

11/09/2016 19:08:51 | | CUDA: NVIDIA GPU 0: GeForce GTX 750 Ti (driver version 372.70, CUDA version 8.0, compute capability 5.0, 2048MB, 1689MB available, 1622 GFLOPS peak)
11/09/2016 19:08:51 | | OpenCL: NVIDIA GPU 0: GeForce GTX 750 Ti (driver version 372.70, device version OpenCL 1.2 CUDA, 2048MB, 1689MB available, 1622 GFLOPS peak)
11/09/2016 19:08:51 | | OpenCL: AMD/ATI GPU 0: Pitcairn (driver version 2117.13 (VM), device version OpenCL 1.2 AMD-APP (2117.13), 2048MB, 2048MB available, 1840 GFLOPS peak)
11/09/2016 19:08:51 | | OpenCL: AMD/ATI GPU 1: Pitcairn (driver version 2117.13 (VM), device version OpenCL 1.2 AMD-APP (2117.13), 2048MB, 2048MB available, 1840 GFLOPS peak)
11/09/2016 19:08:51 | | OpenCL CPU: Intel(R) Core(TM) i5-2500K CPU @ 3.30GHz (OpenCL driver vendor: Advanced Micro Devices, Inc., driver version 2117.13 (sse2,avx), device version OpenCL 1.2 AMD-APP (2117.13))
11/09/2016 19:08:51 | | OpenCL CPU: Intel(R) Core(TM) i5-2500K CPU @ 3.30GHz (OpenCL driver vendor: Advanced Micro Devices, Inc., driver version 2117.13 (sse2,avx), device version OpenCL 1.2 AMD-APP (2117.13))

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Seti@home Classic account User ID 955 member since 8 Sep 1999 classic CPU time 539,770 hours

Please run GPU CAPS Viewer or SIV to make sure you do only have one GPU on the AMD board, because Sapphire sells Dual R9 270X 2GB boards.

You can also run CLInfo.exe (get CLInfo.zip from here, unpack it into a temp directory and run it from a command line)

E.g. you have unpacked it to C:\CLInfo

cd\clinfo {enter}
clinfo.exe >> clinfo.txt {enter}

The second command runs all output into that text file.
After this open clinfo.txt with Notepad and post all contents in an answer here.

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