+- hashcat Forum (https://hashcat.net/forum)
+-- Forum: Deprecated; Previous versions (https://hashcat.net/forum/forum-29.html)
+--- Forum: General Help (https://hashcat.net/forum/forum-8.html)
+--- Thread: Speed Problem with R9 295X2 (/thread-4023.html)
Pages:
1
2
Speed Problem with R9 295X2 - BarcadiRazz - 01-28-2015
Hey hashcat forum
I finally did it! Bought today a R9 295X2 and I really LOVE it! But I have some questions about it, maybe I am using hashcat wrong
Here is a screenshot. http://prntscr.com/5y9pf1
My question now is: Why do they have different speeds? I mean why has the GPU#1 7000MH/s
GPU#2 2000MH/s
Shouldnt they be the same? I mean both at 7000MH/s?
Any solution for that?
The hashtype is Raw-MD5
I am using Catalyst 14.12 Omega
RE: Speed Problem with R9 295X2 - epixoip - 01-28-2015
You must not read the forums very often.
1. Catalyst 14.12 is horribly, horribly broken and is not to be used. You must use exactly Catalyst 14.9.
2. If you are using 14.12 that means you are also using --force. oclHashcat explicitly tells you not to complain about bugs if you are using --force
3. We've said several times on these forums that the 295X2 is not a good card to use with oclHashcat because it will throttle due to its insane power requirements and low maximum temperature of only 75C.
RE: Speed Problem with R9 295X2 - BarcadiRazz - 01-28-2015
Ok. I will try the old driver! Maybe it works. Yep. I used --force
Power Requirements are no problem because I've got a good Power Supply!
RE: Speed Problem with R9 295X2 - epixoip - 01-28-2015
Power supply is irrelevant. The 295X2 requires nearly 550W when using oclHashcat, but it is only a 500W card. So the firmware will throttle the GPUs to keep the power draw under 500W. This is what AMD calls "PowerTune." It dynamically manages clocks and voltages to prevent the card from drawing too much power.
The card also has a maximum temperature of 75C, unlike the 290X which has a maximum temperature of 95C. This means if the card starts to get anywhere near 75C, the firmware will throttle the GPUs to keep the temperature down. This limit is way too low, but there's nothing you can do about it.
Both of these things make the 295X2 a poor choice for oclHashcat use.
This has all been explained multiple times before. Search the forums.
RE: Speed Problem with R9 295X2 - BarcadiRazz - 01-28-2015
hmmm yep I didnt read it before... Any chanche to modify hashcat or the firmware to make it working better?
I installed now 14.9 but it crashes after some minutes. Using currently ocl 1.32
regards
RE: Speed Problem with R9 295X2 - epixoip - 01-28-2015
No.
RE: Speed Problem with R9 295X2 - BarcadiRazz - 01-29-2015
(01-28-2015, 11:58 PM)epixoip Wrote: No.
What would you rather me to do?
RE: Speed Problem with R9 295X2 - BarcadiRazz - 01-29-2015
Something what I dont understand is, if I do a benchmark I get this MD5 Results.
http://prntscr.com/5yb1eq
RE: Speed Problem with R9 295X2 - epixoip - 01-29-2015
Benchmark only runs for a few seconds, not usually enough time for it to throttle.
It's also possible that you were not giving your GPUs enough work to do in your first screenshot.
RE: Speed Problem with R9 295X2 - abaco - 01-29-2015
But a 1600 W PSU like "Super Flower Leadex 80 Plus Titanium" should handle 2 of these cards and a cpu rite? I gona put it under water so temps wont be a issue.