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2x7990 or 4x7970
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02-07-2013, 09:27 PM
agree blandy. and that's why we started putting a max of three cards per chassis, with one pci slot in between each card. that way the cards are not directly side-by-side and have adequate airflow. four cards is doable if you can put some kind of spacer in between them, but still not ideal.
02-07-2013, 09:51 PM
Before putting Arctic Accelero Coolers on:
https://home.btconnect.com/md5decrypter/g...280004.JPG https://home.btconnect.com/md5decrypter/g...280009.JPG After, (The cardboard underneath stops the heat being blown down and cooking mobo / CPU / PSU etc and it was a problem!): https://home.btconnect.com/md5decrypter/g...200029.jpg Examples of dust on existing reference cards, (they were second-hand obviously): https://home.btconnect.com/md5decrypter/g...40001_.jpg https://home.btconnect.com/md5decrypter/g...40004_.jpg https://home.btconnect.com/md5decrypter/g...40005_.jpg
02-07-2013, 10:27 PM
I'm really surprised that you needed to put Accelero coolers on 5870s, especially when you had that much spacing in between them. I like your setup there though, that's pretty slick!
I could not overclock the cards at all with reference coolers on, cracking hard-ass algos like WPA/WPA2 or mscache2, they would still hit 90oC on stock clocks easy. With Accelero's on, they dont go over 66oC when clocked @ 900MHz core and 1300MHz mem. I can clock higher but keep becomes unstable after 950MHz.
That said, the bloody dust build-up on the reference coolers caused most of the over-heating issues lol  but cleaning the reference coolers is not easy, have 2 take them totally apart!
02-23-2013, 01:22 AM
Some time passed and I got a PC!
 But the speed test shows less than expected: Quote:Hashes: 1 total, 1 unique salts, 1 unique digests I saw HD7970 test on another post - the speed was about 8000 M/s. Why I got 5300 on the same HD7970? Maybe I need something to adjust? Thank you.
02-23-2013, 09:26 AM
Quote:Workload: 256 loops, 80 accel that's what you need to adjust. if you're using lite, use "-m 0 -b --benchmark-mode 1" to test your speed. if you're using plus, use "-n 800 -u 1024" with a large keyspace.
Thank you. Tryed "-n 800 -u 1024" with another parameters (as in theme '8 x AMD HD7970 @ 1050MHz'):
-n 800 --gpu-loops 1024 -1 ?l?d?s?u --outfile-watch 0 --restore-timer 0 --runtime 10 --pw-min 8 -m 0 ffffffffffffffffffffffffffffffff ?1?1?1?1?1?1?1?1?1 Now I got: Quote:Speed.GPU.#1...: 9733.2M/sGood result! But now I see that I need to install additional 4 fans, because cards temperature reaches 90 degrees. I'll work on that.
I need to make something like this:
https://home.btconnect.com/md5decrypter/g...280004.JPG https://home.btconnect.com/md5decrypter/g...280009.JPG I should use "Adapter Extender Cable": https://cablesaurus.com If I will use this "x1 -> x16" - how it affect the speed? Also, If I will use two of them to get cable with length*2, how it affect the speed?
03-08-2013, 05:09 PM
that's blandyuk's rig.
the speed will not be affected using a 1x slot. i've daisy-chained extenders and not noticed a difference in speed. |
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