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04-05-2015, 04:47 AM
(This post was last modified: 04-05-2015, 04:48 AM by extrasilver.)
i'm looking a building a setup and my mind is set on the ASRock H81 Pro BTC Motherboard and using 6 pci 1x to 16x ribbon adapters
i have a small 450w power supply for the motherboard and two dell server power supply's in parallel with are capable of a constant 120amps on the 12v rail which I'll be using to power the cards
does anyone know how well this setup would perform? how many k/s cracking WPA2?
and with having this kind of setup would people be interested in renting time? curious to know
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The main hashcat page lists statistics for 7970, so double that for 7990s:
http://hashcat.net/oclhashcat/ (search for 'wpa2')
So if you can get all 6 working, I would guess 142 kh/s x 12 = 1.7 Mh/s for WPA2.
This may also be helpful:
http://hashcat.net/forum/thread-2404.html
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6x 7990 is not possible. 7990 is a dual-GPU card, so 6*2 = 12 GPUs. However the driver only supports 8 GPUs. Maximum possible 7990s in one system is 4.
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(04-05-2015, 07:16 AM)epixoip Wrote: 6x 7990 is not possible. 7990 is a dual-GPU card, so 6*2 = 12 GPUs. However the driver only supports 8 GPUs. Maximum possible 7990s in one system is 4.
ah i see thanks.. 6 would be nice but 4 would still make a real nice set-up.. i'm a little confused with comparing Mh/z and Kh/s to keys per second.. i understand this varies depending on the type of hash but in terms of wpa2 what would be a good guess on the keys per second running 4 7990's?
p.s i'm relatively new to hashcat and the world of hashes but i am learning so don't hate me haha
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In this case, (h)ashes per second is the same as keys per second.
4x7990 = 8x7970 ~ 1,12 Mh/s
For a keyspace of 00000000 - 99999999 this means it would take 90 seconds.
Note that the 7990 is a bad one for password cracking. The speed is good but it's constantly overheating.
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I've got a machine with a 7990. You need good airflow in the case, otherwise it will run hot. If you try to stuff 4 in one case good luck. I had two 7970's and a 7990 running in one case with a space between the cards and the 7990 still ends up having issues if I don't slow the clock speeds down on the front GPU.
