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.
Benchmarks:
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.
| v2.0 | v2.5 | |
| MD5 | 45B/sec | 74.2B/sec |
| NTLM | 70B/sec | 143.8B/sec |
| MD4 | 75.2B/sec | 149.8B/sec |
| SHA1 | 15.4B/sec | 25.9B/sec |
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.
DG
8:32 am, July 26, 2012disclosure /
Any competitor in the same class?
1:19 am, August 24, 2012bob /
What did you do for keeping the cards cool while so tightly packed?
7:20 pm, August 24, 2012d3ad0ne /
Bob, the cards actually stay quite cool. With the server cover on air flow is directed from front to back. Three large server fans direct airflow directly through the heatsinks of the cards. These cards where specifically chosen due to the open-ended heatsink covers just for this purpose.
11:29 am, September 19, 2012One /
Hello d3ad0ne.
I have a question to ask you, and it’s quite simple:
Would you rent that machine just for one day?
Thanks for all.
Waiting your reply.
One.
11:42 am, September 24, 2012Dr0pB3ar /
What’s the noise like with all the fans running. We are looking at getting a couple of these at work for the same purpose as you but we are still only working out of a small office. I might just need to buy some hearing protection…
Also, how many c/s do you get on WPA/2500 with a Mask or Dict attack?
Cheers,
Dr0pB3ar
4:16 pm, October 8, 2012Frosty /
Thing of beauty.
Have you ever run Cryptohaze (GPU Rainbow tables) on this? I’m guessing at those kinds of insane speeds that reading to/from rainbow tables would bottleneck this unless done from a RAID array built for speed.
12:52 pm, February 19, 2013vdm /
Hi !
Nice configuration. What are the dimensions of your GPU cards, i’m thinking about doing the same configuration with 8 MSI R7970 Lightning.
4:56 pm, May 15, 2013john /
what motherboard did you use for this? I can’t seem to find any with 8x pcie16 with dual card width.