CPU can crack the password but GPU can't

[ck365]

Second, there is no difference in speed for integrated CPU/GPU, so clamp hashcat to use the CPU opencl driver

When using pure kernels, CPU is faster than GPU. But when using optimized kernels with -O, GPU is faster than CPU.

Test results for an md5crypt hash:

hashcat test.txt -m 500 -a 3 ?a?a?a?a?a?a -D 1 -O
Time.Estimated...: Wed Jun 25 18:50:58 2025 (77 days, 21 hours)

hashcat test.txt -m 500 -a 3 ?a?a?a?a?a?a -D 2 -O
Time.Estimated...: Sat Apr 19 16:00:15 2025 (10 days, 18 hours)


hashcat test.txt -m 500 -a 3 ?a?a?a?a?a?a -D 1
Time.Estimated...: Wed Aug 06 15:34:27 2025 (119 days, 18 hours)

hashcat test.txt -m 500 -a 3 ?a?a?a?a?a?a -D 2
Time.Estimated...: Tue Apr 13 08:02:16 2027 (2 years, 4 days)