nvidia plugin CUDA8 works maximum with 16 threads

[berezinevgeniy]

Cuda 8 version is works for me? but only with 16 threads max.
I have several GPU 640M, 720M, 740M, 800M, 920M....with Fermi, as i think
It`s works only with CUDA 8. I use 5.0.1 xmrig with cuda 8 plugin.
When i set more than 16 thread (24, 32, 48, 64) app will crash with:

thread #0 failed with error <cryptonight_core_gpu_hash>:752 "an illegal memory access was encountered"

number of blocks doesn`t metter. Almost gpu has 2 SMX with 2Gb memory. And bxt 16x16 is not enough for full throttle. 16x32 and 16x64 will get more hash. There is no problem with xmr-stak cuda8 version, but randomx version of xmr-stak has no cuda 8 -(
Can you help me with xmrig?

p.s. log
[2019-11-28 23:13:08.170] Huge pages support was successfully enabled, but reboot required to use it

• ABOUT XMRig/5.0.1 gcc/9.2.0
• LIBS libuv/1.31.0 OpenSSL/1.1.1c hwloc/2.0.4
• HUGE PAGES unavailable
• CPU Intel(R) Core(TM) i3-4160T CPU @ 3.10GHz (1) x64 AES
  L2:0.5 MB L3:3.0 MB 2C/4T NUMA:1
• DONATE 1%
• ASSEMBLY auto:intel
• POOL Cleanup everything in GPU context when releasing it #1 10.54.0.1:3333 algo auto
• COMMANDS hashrate, pause, resume
• OPENCL disabled
• CUDA 8.0/9.1/2.0.1-beta
• NVML 9.388.73/388.73 press e for health report
• CUDA GPU #0 01:00.0 GeForce 800M 1475/900 MHz smx:1 arch:21 mem:1691/2048 MB
  [2019-11-28 23:13:08.217] net use pool 10.54.0.1:3333 10.54.0.1
  [2019-11-28 23:13:08.217] net new job from 10.54.0.1:3333 diff 1200 algo cn/r height 1976945
  [2019-11-28 23:13:08.217] nv use profile cn (1 thread) scratchpad 2048 KB
  | # | GPU | BUS ID | I | T | B | BF | BS | MEM | NAME
  | 0 | 0 | 01:00.0 | 256 | 32 | 8 | 8 | 25 | 512 | GeForce 800M
  [2019-11-28 23:13:08.420] nv READY threads 1/1 (205 ms)
  [2019-11-28 23:13:09.608] nv thread #0 failed with error <cryptonight_core_gpu_hash>:752 "an illegal memory access was encountered"
  [2019-11-28 23:13:11.404] SIGHUP received, exiting
  [2019-11-28 23:13:11.404] nv stopped (9 ms)

[Spudz76]

Try inverse, 32x16 or 64x16
I usually get good perf with between 32x8 and 48x8 actually