Update to Tahiti:
It’s been about a year and a half since version 2.0 of Erebus was assembled. The lot of 6970 cards has served me well over that time. It was however time for a bit of an update. With the release of ATI’s Tahiti chipset it offered an upgrade over the current Cayman cards. The 7970′s supported stock core clock speeds of 925Mhz vs the 6970′s 880Mhz, and 2,048 stream processors over 1,536 cores. There was some concern with the new cards having 3GB per card vs 2GB with the older cards, but was later found not to be an issue. With all the 6970′s removed and the 7970′s in their place the core count went from a total of 12,288 to 16,384. With the cards in place the only update that was needed was an update to the current ATI drivers.
The new cards of course brought with it an increase in hash cracking speeds. Below shows the difference in speeds from 6970′ to 7970′s. The full set of benchmarks can be seen here. Note: V2.5 is using v0.10 of oclHashcat-lite.
To give you an idea how fast that is, it would take 12hrs to brute force the whole key space for any upper, lower, special, or digit password at length 8 for NTLM. The true magic with the updated chipset is the increase in multi-hash speeds. Now with even 2M hashes I’m seeing speeds of 20B/sec. No other updates are planned for a now, but should be more than enough speed for the next year or so.