TESLA M60 - signature unmatched

After spending much time setting up CUDA + NVIDIA on AWS Ubuntu - g3.16xlarge - finally starts but immediately throws a 'Signature unmatched' error.. and showing OpenCL devices skipped.. 

here's the output:

./hashcat -a 3 -m 11300 test.txt ?a?a?a?a?a

CUDA API (CUDA 10.1)

====================

* Device #1: Tesla M60, 7618 MB, 16MCU

* Device #2: Tesla M60, 7618 MB, 16MCU

* Device #3: Tesla M60, 7618 MB, 16MCU

* Device #4: Tesla M60, 7618 MB, 16MCU



OpenCL API (OpenCL 1.2 CUDA 10.1.152) - Platform #1 [NVIDIA Corporation]

========================================================================

* Device #5: Tesla M60, skipped

* Device #6: Tesla M60, skipped

* Device #7: Tesla M60, skipped

* Device #8: Tesla M60, skipped



Hashfile 'test.txt' on line 1 (bitcoi...b2bfdec75bf*************): Signature unmatched
No hashes loaded.