Bruteforce not finding simple 4 letter hash?

[led5150]

Ah I see.

I just tried using -D 2 and same thing.  So yeah that GPU is basically useless since you can only update those drivers by updating the OS...  thanks Apple.

Funny enough, it does find it without the -O flag.  Would it be safe/reliable to use without it?  Or would you say the speed loss is not a good tradeoff?

Thanks a lot for helping with this.  It's been a journey figuring all this out!