@Ostenbacken your code works ok with my boards, but i have 4 chips only at the moment on boards, there is very low error rate, about 1% - running for 8 hours approx @ 1V 1400mhz but i have some wierd situation when i build code and program chip with that .hex, i have higher error rates and simply it just not working like your compiled hex. need to see what is wrong there,
Can you tell more details? What kind of errors are you getting (HW error rate or smth else)? Did you try lower speeds? Do you get the exact speed per chip according to the software setting? When you built the code, did you change ChipCount to 4 in the file "klondike.c", line 127? Also, to what locations of the board did you solder your 4 chips? There are two chains on the board up to 8 chips each. If you mount a smaller number of chips, you must distribute them evenly across chains, or the firmware will treat them incorrectly. Also the total number of chips must be even so that both chains contain the same number of chips.