VacantPaper (OP)
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Activity: 28
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April 17, 2013, 11:51:20 PM |
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Here is what I've done to achieve max hashrate for this GPU. I set the core voltage to 1250, and the core clock to the max of 1200Mhz. Works without crashing. Of course you'll wanna adjust the fan speed too; I personally don't mind the noise, so I have it set to 100% speed when it hits 60C.
This setting gets me 612 MH/s, with the flag "-w 64." And the temperature is the same for me, 76 - 78C while mining for a while.
So if you wanna get another 100 MH/s, this is what ya do. Cheers!
*NOOB WARNING: Do not attempt to overclock your graphics card if you don't know what your doing! It voids any warranty you have on it, and can break the card if you do it wrong.*
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Rawted
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April 18, 2013, 12:41:49 AM |
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I have 7950s running stable at 670 mh/s (currently scrypt though). They are the new sapphire 7950s that newegg had a special on. i have 4 per rig running at this rate stable. I'll share the settings when i get home.
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bitman442
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April 18, 2013, 01:24:24 AM |
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I have mine running at 1.238 Vcore with 1175/900 clocks. I'm using GCminer with intensity set at 10, and the latest beta drivers. I'm getting 618 mh/s steady. The only thing is, I have to go into the Catalyst control panel and set the power control to 20% for it to work at full speed
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rograz
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April 18, 2013, 01:32:28 AM |
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I prefer running mine at 900MHz@0,95V tbh (scrypt, can probably do 0,9V at same speed mining btc)
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jjiimm_64
Legendary
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Activity: 1876
Merit: 1000
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April 18, 2013, 03:39:09 AM |
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I prefer running mine at 900MHz@0,95V tbh (scrypt, can probably do 0,9V at same speed mining btc)
+1. half the power. half the heat. half the down time. card will live 4 times as long!!!!! |
1jimbitm6hAKTjKX4qurCNQubbnk2YsFw
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bitman442
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April 18, 2013, 04:07:57 AM |
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I prefer running mine at 900MHz@0,95V tbh (scrypt, can probably do 0,9V at same speed mining btc)
+1. half the power. half the heat. half the down time. card will live 4 times as long!!!!! It depends on why you are mining. I'm not mining for profit at today's prices, I mine in hopes that someday they will be worth a whole lot more. When that happens I don't want to look back and think of how many more coins I missed out on to save a few bucks on my electric bills. If I were mining to sell and profit right now, then yes power efficiency would be a huge factor. This may sound like a stupid question, but why would you buy a 7950 and underclock it so much instead of buying a cheaper card like a 7870? Also, what type of hashrate are you getting at those speeds? |
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Bitsaurus
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April 18, 2013, 09:01:15 AM |
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I prefer running mine at 900MHz@0,95V tbh (scrypt, can probably do 0,9V at same speed mining btc)
+1. half the power. half the heat. half the down time. card will live 4 times as long!!!!! It depends on why you are mining. I'm not mining for profit at today's prices, I mine in hopes that someday they will be worth a whole lot more. When that happens I don't want to look back and think of how many more coins I missed out on to save a few bucks on my electric bills. If I were mining to sell and profit right now, then yes power efficiency would be a huge factor. This may sound like a stupid question, but why would you buy a 7950 and underclock it so much instead of buying a cheaper card like a 7870? Also, what type of hashrate are you getting at those speeds? Back in 2011 we had hundreds of threads on this. Getting more hash/watt often means more density. Instead of being able to put 300 cards in a room you can put 500. The cards might be negligible in comparison to electricity and rent for farms |
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Edvin512
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April 19, 2013, 12:47:23 AM |
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100% fan is guaranted to fuck it up very fast
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I am like a lennisters
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Slix313
Newbie
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Activity: 14
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April 19, 2013, 02:21:22 AM |
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*NOOB WARNING: Do not attempt to overclock your graphics card if you don't know what your doing! It voids any warranty you have on it, and can break the card if you do it wrong.*
Which manufacturer is the card your using for this and what the wattage use? |
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BBN
Member
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Activity: 77
Merit: 10
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April 19, 2013, 08:13:22 AM |
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100% fan is guaranted to fuck it up very fast
Life Expectancy of the FAN is always calculated at 100% as is with all fans. Running below that line will simply extend the expected life span. I guess changing the fan on the GPU is easier than getting a new GPU  |
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rograz
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April 19, 2013, 08:03:55 PM |
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Most fans will die at 100% very quickly, if you plan on running the cards for longer than 2-3 months then just don't. You will just have downtime switching out the fans and like it was said before density > max MH/card unless you have free power in unlimited amounts and don't have to worry about the heat output at all. If you are just running your gaming machines in your parents basement then sure go ahead OC that thing to hell and have it pull 350W/card. Try running 25-30 cards + at those conditions for a longer period of time and you will start running into problems.
Ive even taken my cards down to 0,875V just so I can fit 6x7950s on a single 1KW psu.
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BBN
Member
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Activity: 77
Merit: 10
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April 19, 2013, 08:27:02 PM |
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I wish LTC was nice with undervolting...
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glendall
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Activity: 2100
Merit: 1018
Sugars.zone | DatingFi - Earn for Posting
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April 19, 2013, 08:33:53 PM
Last edit: April 19, 2013, 08:48:44 PM by glendall |
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I have 7950s running stable at 670 mh/s (currently scrypt though). They are the new sapphire 7950s that newegg had a special on. i have 4 per rig running at this rate stable. I'll share the settings when i get home.
Holy crap really? Nice work. I have to get tweaking my own it seems... Have been pretty happy just at around 590 for scrypt...seems I have some work ahead of me tonight... edit: Please post your cooling used as well when you show the settings tonight. Thanks. |
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rograz
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April 19, 2013, 09:41:54 PM |
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I wish LTC was nice with undervolting...
im running scrypt, cards can do about 25-50MHz higher on same voltage mining BTC but there is still a lot of room for undervolting with scrypt. |
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BBN
Member
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Activity: 77
Merit: 10
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April 20, 2013, 07:11:38 PM |
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I actually do undervolt my Vapor as stock is 1.250  |
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rograz
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April 20, 2013, 07:39:31 PM |
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I actually do undervolt my Vapor as stock is 1.250 whatever happened with voltage going down when we switched to a smaller process, 5870s were 1.15 and 5970 was even down to 1.05 at stock :p |
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Thracian
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April 21, 2013, 12:15:00 PM
Last edit: April 21, 2013, 10:23:02 PM by Thracian |
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Let me just report working settings for me on a SAPPHIRE HD7950 3G GDDR5 (using Trixx) GPU Clock 1190 Mem clock 1040 VDDC 1.206 Board Power +20 (Sidebar Gadget reports actualy 1.125V, 62W VDDC power, 55 Amp, 59 Celcius at 78% Fan) This is ok for 24/7 in a 20 Celcius room and gives in Bitminter around 610-615 Mhps I can give another 10 or 20 Mhz but it becomes unstable. PC works ok on everyday tasks. For GPU intensive tasks (eg photoshop) I disabled the GPU hardware acceleration, so that it doesn't interfere with mining |
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Edvin512
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April 21, 2013, 03:12:37 PM |
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let me just report settings for dual 7950 vapor-x
950core, 1250mem, 0.956volts = 1150 k/hash
415watt at wall, 170watt each card
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I am like a lennisters
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NetcodePool
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April 21, 2013, 03:15:02 PM |
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Im getting the same 170watt per card.
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netcodepool.org
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BBN
Member
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Activity: 77
Merit: 10
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April 21, 2013, 07:48:42 PM |
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I actually do undervolt my Vapor as stock is 1.250 whatever happened with voltage going down when we switched to a smaller process, 5870s were 1.15 and 5970 was even down to 1.05 at stock :p Its the silly "Boost" feature I guess, the cooling on the Vapor is more than excellent. I have a "reference" 7950 Sapphire 0.981v stock and it has no problems getting to 962 while clocking the GPU at the same time.. |
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