KnCMinerOverclocking

Overview

The KnC Miner hardware runs as a BeagleBoard controlling a number of ASIC modules. Each of the ASIC modules has 4 or 8 "dies". During the starting of the miner the clock rate of the ASICs is set via the SPI protocol to each die. Therefore we can adjust the clock rate of each die to find a good balance for each miner.

The BeagleBoard is running a minimal Linux operating system. You'll need to understand a bit about ssh, bash and maybe scp in order to achieve an over-clock.

Model Differences

The October released miners have the "easiest" firmware to modify, the commands to set the speed of the dies is located within /etc/init.d/cgminer.

With the November miners we'll need to add similar code to perform the setting of the clock rate.

Frequency Values

MHz
700.0	1B1	372
712.5		382
725.0	1C1	392
737.5		3A2
750.0	1D1	3B2
762.5		3C2
775.0	1E1	3D2
787.5		3E2
800.0	1F1	3F2
812.5		402
825.0	201	412
837.5		422
850.0	211	432
862.5		442
875.0	221	452
887.5		462
900.0	231	472
912.5		482
925.0	241	492
937.5		4A2
950.0	251	4B2

Over-clocking Guide

1. Determine miner model
2. Setup SSH access to miner
3. Install bgminer
4. Update /etc/init.d scripts to use bgminer
5. Setup method to monitor temps/current/voltage/wattage
6. Update init.d scripts with new clock rate
7. Restart bfgminer
8. Monitor temps/etc
9. If performing badly or temps/draw very high stop mining go back to 6
10. Profit!