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January 04, 2014, 07:11:09 PM |
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Got a problem. I found a motherboard that can use a cpu, cooler, and some RAM sticks I had laying around from a previous computer, and it had 2 GPU slots, so I figured I could make a cheap miner out of it.
Everything but the motherboard has been used in previous mining PCs and all worked well.
I had this setup going on a single 7950 for a week, and it was rock solid. Never needed a restart, with the 7950 pimping out 650+ Khash the whole time.
But when I try to run 2 7950's, it fails. CGminer will start to start, then it gives the error -5 enqueing onto kernel error. I did make the changes in the cgminer batch file to run two gpus.
I can run either 7950 in either slot and it's fine. But 2 7950's? No go. I even tried using my powered riser cables to run one 7950 out of a PCI-E x1 slot. Didn't work.
Any ideas?
Motherboard is an Asus P5W DH Deluxe (about 7 years old), but it was in new packaging. 3.40 Pentium D cpu, 4 GB of PC2-5300 RAM, Windows 7 Pro SP1 64 bit on the hard drive, CGMiner 3.3.0, 12.8 drivers and 2.7 SDK, which has worked fine in several other mining PCs for me.
I'm guessing some sort of hardware conflict is the problem, because I can make it do anything with one gpu but 2 gpus and it screws up every time. I went through the BIOS, the hard drive is running in AHCI, and no cpu overclocking.
I tried lowering the TC all the way down to 2048 and it still had the same -5 error. One gpu alone runs fine at 24064 TC.
GPUs are a Sapphire dual x 7950 and an HIS Ice-Q 7950, both have 3 GB memory.
Here's my exact code I'm using, except for user name and password. Putting the TC on 4096 didn't work either. I vary the cpu and memory clock speeds too, but I put them on lower safer values while dealing with this problem.
timeout /t 2
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer --scrypt -o stratum+tcp://dogeu.nut2pools.com:5585 -u USERNAME -p PASSWORD -o stratum+tcp://dogus.nut2pools.com:5585 -u USERNAME -p PASSWORD
-I 12 --temp-cutoff 90 --temp-overheat 85 --temp-target 75 -g 1 -w 256 --thread-concurrency 2048,2048 --shaders 1792,1792 --gpu-engine 1000,1000 --gpu-memclock 1250,1250
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