In February 2017, I co-authored a blog detailing our build of an 8-GPU password cracker. Over the past 8 years, it’s had millions of views and thousands of comments. To all the concerned writers, nothing has melted down and we continue to run 2 nearly identical 8-GPU crackers today. Both are currently running 8 NVIDIA GTX 1080Ti cards. Now that prices are dropping on the 3080Ti cards, stay tuned for an upgrade blog!

We also got our hands on one of NVIDIA’s latest cards! We missed the October 12th launch by 9 days but finally found an overclocked Gigabyte GeForce RTX 4090 GAMING OC 24G for sale locally.

Our Goals:
  • Benchmark NTLM hash cracking performance and compare it to our current RTX 3090 and GTX 1080Ti cards
  • Based on the 4090’s cracking performance, design a new “Kracken4” cracking rig
  • Utilize individual 4090 cards for quick local password cracking
Stay tuned for a future article on our monster RTX 4090 Kracken4 build!!

For our unscientific analysis, we used Hashcat’s NTLM (-m 1000) benchmark (-b) to test our 2 current model cards and the new RTX 4090. This included the NVIDIA GTX 1080Ti, NVIDIA RTX 3090, and NVIDIA RTX 4090.
 
Device (as seen by Hashcat) Hashcat NTLM Benchmark Speed
GeForce GTX 1080 Ti, 11039/11178 MB, 28MCU 66.76 GH/s (28.03ms)
NVIDIA GeForce RTX 3090, 23680/24575 MB, 82MCU 121.2 GH/s (22.55ms)
NVIDIA GeForce RTX 4090, 23010/24563 MB, 128MCU 252.0 GH/s (16.74ms
All benchmark tests were performed using Hashcat 6.2.6 using the -b and -m 1000 options (-O is applied automatically)
 
When attempting to crack a single NTLM hash using an 8-character brute force crack, the actual average performance was closer to 225 GH/s. Without any tuning and using the latest NVIDIA driver for Windows, the RTX 4090 could brute any 8-character password in approximately 8 hours!
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