09-24-2013, 10:13 PM
(09-24-2013, 12:24 PM)raist2 Wrote: 1) does operating system matter?
no.
(09-24-2013, 12:24 PM)raist2 Wrote: 2) does ram and CPU matter? maybe for password candidate generation and I/O thru the GPUs?
no. password candidates are generated on the gpu.
(09-24-2013, 12:24 PM)raist2 Wrote: 3) are the reference values (in hashcat main page) calculated with the benchmark option? if so, can those values be different from real life cracking?
every attack mode shows different performance in different circumstances. the numbers provided on the site are for reference only. YMMV.
check your -n and -u values, optimize your dictionaries by sorting them by length, make sure you're giving the cards enough work.
(09-24-2013, 12:24 PM)raist2 Wrote: 4) which is the reason behind multi-hash speed decreasing so hard when the hash list grows?
GPU memory.
you will really only see this on AMD and older Nvidia cards. newer Nvidia cards have a much better memory controller, and they have a large L2 cache, so there isn't as much of a performance hit on large hash lists.