Why is boinc not using my second (older) GPU? Why is it "ignored by config"? What do I need to adjust or change to use both?

For boinc to use multiple GPUs, do they have to be identical?

 Running under account Vero & Laslo P  PhD
 CUDA: NVIDIA GPU 0: GeForce GTX 1660 Ti (driver version 432.00, CUDA version 10.1, compute capability 7.5, 4096MB, 3558MB available, 5437 GFLOPS peak)
 CUDA: NVIDIA GPU 1 (not used): GeForce GT 640 (driver version 432.00, CUDA version 10.1, compute capability 3.5, 1024MB, 822MB available, 803 GFLOPS peak)
 OpenCL: NVIDIA GPU 0: GeForce GTX 1660 Ti (driver version 432.00, device version OpenCL 1.2 CUDA, 6144MB, 3558MB available, 5437 GFLOPS peak)
 OpenCL: NVIDIA GPU 1 (ignored by config): GeForce GT 640 (driver version 432.00, device version OpenCL 1.2 CUDA, 1024MB, 822MB available, 803 GFLOPS peak)
 Host name: VP-Laszlo-P-PhD
 Processor: 12 AuthenticAMD AMD Ryzen 5 1600 Six-Core Processor [Family 23 Model 1 Stepping 1]
 Processor features: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 htt pni ssse3 fma cx16 sse4_1 sse4_2 movebe popcnt aes f16c rdrandsyscall nx lm avx avx2 svm sse4a osvw skinit wdt tce topx page1gb rdtscp fsgsbase bmi1 smep
 OS: Microsoft Windows 10: Professional x64 Edition, (10.00.17763.00)
 Memory: 15.93 GB physical, 18.31 GB virtual
 Disk: 464.99 GB total, 422.50 GB free

the OS recognizes and uses both; why won't boinc?

If boinc can use both, can I make separate options for the older v. the newer - separate task assigns, etc?

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Bonic will only use the newest/most powerful GPU so the older one is ignored.

I don't think your 640 is able to be used for this project. Could be wrong but I think it's too old.

For mixed matched GPUs, you need to use a cc_config.xml in the BOINC folder telling it to use all GPUs.

I don't have that file with me, someone else can provide it to you. But I would check on that 640 because if it is too old, then there is really no point going forward with the cc_config.xml

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The card is compatible with the new tasks, though may take more than 2 days to complete a task.
You need to consider requirements as outlined in the recent FAQ found here
(Pay particular attention to section on running multiple GPUs):
http://www.gpugrid.net/forum_thread.php?id=5002

To use all GPUs, add this line under <options> heading to your cc_config.xml: (found in ProgramData\BOINC folder)
<use_all_gpus>1</use_all_gpus>

All available BOINC client options for controlling GPUs found here:
https://boinc.berkeley.edu/wiki/Client_configuration