Umm I have 3x 7950 and 1x 6950 on this rig.. When I use cgminer, it gives me the error: "Error -5: Enqueueing kernel onto command queue. (clEnqueu
eNDRangeKernel)" on 3 out of the 4 cards. This usually happened to me when I didn't export the variables needed by cgminer, but nothing yet. I have 10 GB RAM on this, do I need more?
Topic: Litecoin build for noobs: 3x 7950s (1.8 MH/s) in a $10 crate case - page 7. (Read 79077 times)
April 14, 2013, 07:29:33 PM
April 14, 2013, 06:50:26 PM
Also.... why are you tryingto stay out here ? I really enjoy your posts. Please, also give us an update about your VERY interesting MC2 concept ! 
I will lose my job (and $25,000 for the remainder of the year) if I don't pass my exams that are coming up this week and the following week, so I need to complete them first
MC2 update coming soon, tons of things will be changed (new PoS strategy, more optimized hashing algorithm) based on the feedback I have received.
April 14, 2013, 05:21:25 PM
Hey, trying to stay out of here for a bit, but someone brought these cards to my attention and I thought you guys might want to know about them if you're still building rigs
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202030
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202031
They are AMD 7970 reference boards and thus have really solid voltage regulation and RAM, VRMs are all really well cooled. As such they should all also have voltage control. Once these go out of stock they will likely not be replaced, so grab them while they're still around.
edit: voltage control confirmed with sapphire trixx http://www.overclock.net/t/1378557/sapphire-100352-4l-and-21196-00-20ghd-7950-the-final-holy-grail-of-hd7950s
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202030
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202031
They are AMD 7970 reference boards and thus have really solid voltage regulation and RAM, VRMs are all really well cooled. As such they should all also have voltage control. Once these go out of stock they will likely not be replaced, so grab them while they're still around.
edit: voltage control confirmed with sapphire trixx http://www.overclock.net/t/1378557/sapphire-100352-4l-and-21196-00-20ghd-7950-the-final-holy-grail-of-hd7950s
The BIG problem with trix is that it doesn't save the power settings when you restart your system. That means you can't autorestart the system once in a while without babysitting it.
Also.... why are you tryingto stay out here ? I really enjoy your posts. Please, also give us an update about your VERY interesting MC2 concept !
April 13, 2013, 03:15:50 AM
Hey, trying to stay out of here for a bit, but someone brought these cards to my attention and I thought you guys might want to know about them if you're still building rigs
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202030
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202031
They are AMD 7970 reference boards and thus have really solid voltage regulation and RAM, VRMs are all really well cooled. As such they should all also have voltage control. Once these go out of stock they will likely not be replaced, so grab them while they're still around.
edit: voltage control confirmed with sapphire trixx http://www.overclock.net/t/1378557/sapphire-100352-4l-and-21196-00-20ghd-7950-the-final-holy-grail-of-hd7950s
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202030
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202031
They are AMD 7970 reference boards and thus have really solid voltage regulation and RAM, VRMs are all really well cooled. As such they should all also have voltage control. Once these go out of stock they will likely not be replaced, so grab them while they're still around.
edit: voltage control confirmed with sapphire trixx http://www.overclock.net/t/1378557/sapphire-100352-4l-and-21196-00-20ghd-7950-the-final-holy-grail-of-hd7950s
got my 7950-4l today.
i can drop the voltage.
also, as with my other HIS 7950s which was locked.
apparently flashing 7970's bios works wonder.
April 12, 2013, 10:24:09 PM
okokok... On Sunday amazon had quite a few of the twin frozr III's and I bought 2 (should have done all 3 for this rig).
Taco - Awesome write up - but I have to wonder if this post helped caused the shortage of these cards and drove the price up on ebay to over 900$ lol
those reaper settings are spot on btw.. I'm pulling a little over 600kh a card running them stock in a dual card rig. Def a good recommendation on them. Thanks! Amazing gpus
I'll tip you some of their mined LTC
I'm going to try out the 7970's from this line on another rig I think. Have you used those?
Taco - Awesome write up - but I have to wonder if this post helped caused the shortage of these cards and drove the price up on ebay to over 900$ lol
those reaper settings are spot on btw.. I'm pulling a little over 600kh a card running them stock in a dual card rig. Def a good recommendation on them. Thanks! Amazing gpus
I'll tip you some of their mined LTC
I'm going to try out the 7970's from this line on another rig I think. Have you used those?
April 12, 2013, 07:58:02 PM
Hey, trying to stay out of here for a bit, but someone brought these cards to my attention and I thought you guys might want to know about them if you're still building rigs
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202030
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202031
They are AMD 7970 reference boards and thus have really solid voltage regulation and RAM, VRMs are all really well cooled. As such they should all also have voltage control. Once these go out of stock they will likely not be replaced, so grab them while they're still around.
edit: voltage control confirmed with sapphire trixx http://www.overclock.net/t/1378557/sapphire-100352-4l-and-21196-00-20ghd-7950-the-final-holy-grail-of-hd7950s
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202030
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202031
They are AMD 7970 reference boards and thus have really solid voltage regulation and RAM, VRMs are all really well cooled. As such they should all also have voltage control. Once these go out of stock they will likely not be replaced, so grab them while they're still around.
edit: voltage control confirmed with sapphire trixx http://www.overclock.net/t/1378557/sapphire-100352-4l-and-21196-00-20ghd-7950-the-final-holy-grail-of-hd7950s
I picked up one N82E16814202030 and it does have proper voltage control and beastly capability. I paid $299 for it. If pushed, it can do 600 kH/s or 580 comfortably.
April 12, 2013, 06:38:36 PM
Hey, trying to stay out of here for a bit, but someone brought these cards to my attention and I thought you guys might want to know about them if you're still building rigs
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202030
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202031
They are AMD 7970 reference boards and thus have really solid voltage regulation and RAM, VRMs are all really well cooled. As such they should all also have voltage control. Once these go out of stock they will likely not be replaced, so grab them while they're still around.
edit: voltage control confirmed with sapphire trixx http://www.overclock.net/t/1378557/sapphire-100352-4l-and-21196-00-20ghd-7950-the-final-holy-grail-of-hd7950s
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202030
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202031
They are AMD 7970 reference boards and thus have really solid voltage regulation and RAM, VRMs are all really well cooled. As such they should all also have voltage control. Once these go out of stock they will likely not be replaced, so grab them while they're still around.
edit: voltage control confirmed with sapphire trixx http://www.overclock.net/t/1378557/sapphire-100352-4l-and-21196-00-20ghd-7950-the-final-holy-grail-of-hd7950s
April 12, 2013, 01:31:00 PM
I wish I could get the hash rates I see from some of you out of my rigs!
Ive got two rigs with 5850's, each getting about 320kh/s.
I also just built a rig similar to what this thread talks about, 3 7950's, each getting 500-520kh/s.
Either Im doing something wrong or just unlucky :/
Ive got two rigs with 5850's, each getting about 320kh/s.
I also just built a rig similar to what this thread talks about, 3 7950's, each getting 500-520kh/s.
Either Im doing something wrong or just unlucky :/
here's my setting with 5850 rig : cgminer --scrypt --thread-concurrency 5760 -I 18 -g 1 -w 256
windows 7 32 or 64b,ccc 12.6 (you may install only amd driver without ccc) and sdk 2.6
My 5850's run linux (BAMT with updated drivers for 7xxx cards, unsure exactly what drivers tho) so those settings did not give me any boost.
April 12, 2013, 12:36:01 PM
any alternatives for the vinyl pads? are all of you putting something under your mobo at the bottom of the crate?
April 12, 2013, 05:06:50 AM
again pls can yanyone share software setup ? is important to have 64bit win? or just any win and guiminner and u can mine?
April 12, 2013, 04:55:47 AM
Considering picking up two 7950s next week. Would it be better to run them in Crossfire or no?
April 12, 2013, 03:05:27 AM
I wish I could get the hash rates I see from some of you out of my rigs!
Ive got two rigs with 5850's, each getting about 320kh/s.
I also just built a rig similar to what this thread talks about, 3 7950's, each getting 500-520kh/s.
Either Im doing something wrong or just unlucky :/
Ive got two rigs with 5850's, each getting about 320kh/s.
I also just built a rig similar to what this thread talks about, 3 7950's, each getting 500-520kh/s.
Either Im doing something wrong or just unlucky :/
here's my setting with 5850 rig : cgminer --scrypt --thread-concurrency 5760 -I 18 -g 1 -w 256
windows 7 32 or 64b,ccc 12.6 (you may install only amd driver without ccc) and sdk 2.6
April 11, 2013, 09:07:18 PM
my 850w psu pulled 1100 from the wall.
still not burnt out yet, which is good. i'm looking forward for my new psu.
in the mean time, i need to find the most efficient setting.
still not burnt out yet, which is good. i'm looking forward for my new psu.
in the mean time, i need to find the most efficient setting.
An 850W pulling 1100W from the wall is about right for an 80% efficiency power supply running at full capacity.
850 / 0.8 = 1062.5
What that means is, your system is drawing 850 watts, and your power supply is losing 20% of it to heat. Replacing your PSU with an 80+ platinum would reduce your at-the-wall draw to around 950W.
i got nervous when it spiked to 1300, but eh.
April 11, 2013, 08:12:49 PM
I wish I could get the hash rates I see from some of you out of my rigs!
Ive got two rigs with 5850's, each getting about 320kh/s.
I also just built a rig similar to what this thread talks about, 3 7950's, each getting 500-520kh/s.
Either Im doing something wrong or just unlucky :/
Ive got two rigs with 5850's, each getting about 320kh/s.
I also just built a rig similar to what this thread talks about, 3 7950's, each getting 500-520kh/s.
Either Im doing something wrong or just unlucky :/
April 11, 2013, 09:32:44 AM
nope,it's all ok 
.it has been running for a month without restarting or hanging 
with stock voltage,i set 900/1000mhz(core/mem) ~ 380Khash each
or lower clock,at 850/800 ~ 360Khash
you can undervoltage by using "--gpu-vddc" in cgminer
.it has been running for a month without restarting or hanging with stock voltage,i set 900/1000mhz(core/mem) ~ 380Khash each
or lower clock,at 850/800 ~ 360Khash
you can undervoltage by using "--gpu-vddc" in cgminer
April 11, 2013, 09:16:44 AM
here's one of my rig 4x5850
Used case ~ 2.5$
4 riser 1x->16x ~ 20$
Giga P31+2GB ddr2+Dual E3300 ~ 50$ (all used)
Corsair TX750 new ~ 120$
4x 5850 ~ 440$,all of them are under warranty
all cost ~ 630$
with this rig,i can get about 1.5-1.6Mhash when mining ltc
Used case ~ 2.5$
4 riser 1x->16x ~ 20$
Giga P31+2GB ddr2+Dual E3300 ~ 50$ (all used)
Corsair TX750 new ~ 120$
4x 5850 ~ 440$,all of them are under warranty
all cost ~ 630$
with this rig,i can get about 1.5-1.6Mhash when mining ltc
I like the dangling hard drive. Though I find it hard to believe a 750W PSU can power 4x 5850, must be terribly overloaded, I think it's pretty risky.
April 11, 2013, 09:05:34 AM
my 850w psu pulled 1100 from the wall.
still not burnt out yet, which is good. i'm looking forward for my new psu.
in the mean time, i need to find the most efficient setting.
still not burnt out yet, which is good. i'm looking forward for my new psu.
in the mean time, i need to find the most efficient setting.
An 850W pulling 1100W from the wall is about right for an 80% efficiency power supply running at full capacity.
850 / 0.8 = 1062.5
What that means is, your system is drawing 850 watts, and your power supply is losing 20% of it to heat. Replacing your PSU with an 80+ platinum would reduce your at-the-wall draw to around 950W.
April 11, 2013, 06:53:08 AM
here's one of my rig 4x5850
Used case ~ 2.5$
4 riser 1x->16x ~ 20$
Giga P31+2GB ddr2+Dual E3300 ~ 50$ (all used)
Corsair TX750 new ~ 120$
4x 5850 ~ 440$,all of them are under warranty
all cost ~ 630$
with this rig,i can get about 1.5-1.6Mhash when mining ltc
Used case ~ 2.5$
4 riser 1x->16x ~ 20$
Giga P31+2GB ddr2+Dual E3300 ~ 50$ (all used)
Corsair TX750 new ~ 120$
4x 5850 ~ 440$,all of them are under warranty
all cost ~ 630$
with this rig,i can get about 1.5-1.6Mhash when mining ltc
April 11, 2013, 03:49:55 AM
Ok, bought 12 sapphires, and 3 of everything else. Going to add another mobo and fixing asap. So I will start running 3 rigs with 4 cards each, and will thin them to 4 rigs ASAP.
Noob questions begin here.
1. How do I run the 4 gpus off the mobo listed? Can anyone provide a link to the required extra gear or cables needed. I did upgrade the psu to 1000's already btw
2. How do I clone the harddrives for mining?
3. I got long risers which will space the gpu's no less than 6" apart in a fan like set up, space is not a concern for me. Will this provide adequate cooling space for the 4 gpu on 1 mobo set up in the beginning?
Any tips and suggestions would be great.
Thanks!
Noob questions begin here.
1. How do I run the 4 gpus off the mobo listed? Can anyone provide a link to the required extra gear or cables needed. I did upgrade the psu to 1000's already btw
2. How do I clone the harddrives for mining?
3. I got long risers which will space the gpu's no less than 6" apart in a fan like set up, space is not a concern for me. Will this provide adequate cooling space for the 4 gpu on 1 mobo set up in the beginning?
Any tips and suggestions would be great.
Thanks!
iam not sure if 4x 7950 will work stable with a 1000psu. it will depend on the corevoltage of each card.
i got 2x gigabyte7950, this version is overclocked out of the box with a locked corevoltage of 1,25. each card pulls about 320W, so 4x them would be too much for a 1000w psu
Which gigabyte GPU? I'm running 4x gigabyte 7950 windforce, on a 1200W PSU with no problem, I didn't under-volt. They each only pull 200W barely, probably less. How can a 7950 pull 320W? I hope your 7950 better mine at 1000kh or something. Though you are right, 4x7950 on a 1000W most likely will not work, since PSU only work at 80% efficiency. So that 1000W is only capable of giving you 800W actual power, 4x7950 will eat that up, leaving nearly zero power for other components.
i got this one: http://geizhals.at/eu/gigabyte-radeon-hd-7950-gv-r795wf3-3gd-a732249.html. i got 2 of it + an i5 + 1 ssd . this setup takes 580W under full load, according to my wattmeter. so my guessing of 320W was bit overrated. cpu+ ssd cant take more than 50W. so each card pull about 260W.
as u said 4 would be too much, 3 will work fine with a 1000W
April 11, 2013, 12:03:48 AM
Anyone figure out the sweet spot for good kh/s rate for Sapphire 7950's ?
I've got 5 cards running at 1025/1480 -- default voltage with +10% power (won't stay in high performance mode if I don't add the 10%) but my overall hash rate is only 2.6 Mh/s but many are saying they get 700kh/s(3.5Mh/s) with their 7950's
Any help is greatly appreciated.
I've got 5 cards running at 1025/1480 -- default voltage with +10% power (won't stay in high performance mode if I don't add the 10%) but my overall hash rate is only 2.6 Mh/s but many are saying they get 700kh/s(3.5Mh/s) with their 7950's
Any help is greatly appreciated.
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