Cracking a Password and Figuring out number sequences?

So I got this fat ass gpu waiting to be put to used, is there a specific program I should use?

 

I'm mainly interested in figuring out number sequences more than passwords.

Nvidia or AMD? If it's Nvidia, find a CUDA-accelerated cracker (you'll probably have to make your own), if it's AMD, use an OpenCL-accelerated cracker.

This one: http://hashcat.net/oclhashcat-plus/

This is the best cracker out there and it's customized to work with the latest ATI and nVidia drivers.

If you're running an ATI card, use oclHashcat-plus.exe and if you're using a nVidia card, run cudaHashcat-plus.exe

The tool is pretty straight forward to use and the developers win the password cracking championships every year. They mainly run TYAN server boards with Dual Xeon's and 8 x 7970's. You're talking staggering numbers of cracking. Run the benchmarks test and let us know how it goes. I'll post up the dual Titan results too when I eventually get round to building it.

For password cracking, you're going to need a good wordlist (unless you want to bother with Brute Forcing), I recommend the Crackstation List approx 1.5 Billion unique words. https://crackstation.net/buy-crackstation-wordlist-password-cracking-dictionary.htm

I didn't know motherboard had space for 8 7970's 0.o thats like, 16 slots at least
How big are these moptherboards 0.o or do they run 7990's 

It's possible that they are using 1x to 16x risers in each 1x pci slot.

 

server mobos, with a bunch of PCIE slots, and risers made by tyan. prolly 4x pcie 3.0 x16, and a riser on each

I believe the model most commonly used is the Tyan FT77B7015

This model has 10 PCI-E slots [(2) PCI-E x16 slots (w/ x4 link) / (8) PCI-E Gen.2 x16 slots / (2) PCI-E Gen.2 x1 slots]

Most enthusiasts will go for 8 x 7990's and some have even gone 8x GTX Titans. One Australian Govt Agency I worked with has 5 Tyan's, each with 8 x Tesla K20s  in it, each in a different state for distributed cracking.

The 8 x 7990's best benchmark I've seen so far was a little over 100 billion MD5 hashes per second. To put that in easier to understand terms, one of these boxes, working alone on an MD5 hash such as "88b962f8682911ee5a1b51f3827fc462", will chew through every uppercase, lowercase, numerical and symbol of an 8 character password in 18.62 hours and will uncover your password as #7h3T3k^ although most likely much sooner than that. The worlds largest distributed cracking array would do it in under 5 minutes.

If you made your password 9 characters long, that same machine would take 2.4 months, 10 characters would take 19 years and 3 months and the password such as "ThisIs@VeryL0ngP@55word" would take 9.88 trillion trillion centuries to crack (yep, two trillions in there).

When it comes to passwords, more really is more! Even better when they're salted.