Hi everybody,

here is the updated firmware:
firmware.rar

for the 10-chip board simply change the 'ChipCount' line to 10, we've checked it and it works.

Here is the updated Klondike driver for the bfgminer:

driver-klondike.rar

We are asking everybody who benefited from our firmware and driver troubleshooting, to support our incentive of sharing our achievements with the community by making a small BTC donation to:
19bWQt5ix6u7hgZyYUcADy72MLsuGzCRYn

The updated firmware supports speeds down to 500MHz. It is possible to implement support for lower frequencies as well by using nonzero values for the OD parameter. While making the updates we've hit some Microchip XC8 compiler bugs so that expression evaluations in the UpdateClock() resulted in wrong values. Updating the compiler to the latest version did not help. The workaround was to split big expression evaluations into smaller statements.

Here is the performance achieved with two 10-chip boards and one 16-chip board running at speed 1717 (rated 1.717GH/s per chip). Again, careful thermal design is mandatory to achieve this performance. Heatsinks are required on both sides of the PCB with high-performance rubber inserts between the heatsink and PCB/chips. You can look up overclockers' resources for tips in thermal design.
http://s020.radikal.ru/i710/1402/a6/818c5c336781.png