So I recently built a Litecoin miner. If you haven’t heard of Litecoin, it is basically a new cryptocurrency that branched off of Bitcoin. This rig is based off of the standard 4x Sapphire Radeon 7950 setup. Each card is pulling 600 khash/s, totalling about 2.4 mhash/s altogether. I’m using two PCIe x1 to PCIe x16 adapters and two powered PCI-e x16 adapters. The open air case was built from aluminum angles. The machine runs Xubuntu Linux and pulls about 1200 watts consistently.
The config file for cgminer:
"intensity" : "20", "vectors" : "1", "worksize" : "256", "lookup-gap" : "2", "thread-concurrency" : "21712", "shaders" : "1792", "gpu-dyninterval" : "7", "gpu-platform" : "0", "gpu-threads" : "1", "gpu-engine" : "1025", "gpu-memclock" : "1550", "gpu-powertune" : "20", "gpu-vddc" : "1.100", "temp-cutoff" : "99", "temp-overheat" : "95", "temp-target" : "80", "gpu-fan" : "70-100", "log" : "5", "queue" : "1", "scan-time" : "60", "temp-hysteresis" : "3", "api-port" : "4028", "expiry" : "120", "failover-only" : true, "gpu-threads" : "1", "no-pool-disable" : true, "scrypt" : true, "shares" : "0", "kernel" : "scrypt", "kernel-path" : "/usr/local/bin"
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