But my FPGA still runs fine at 600MHz.
I guess it's stretching the limits. Also it could vary chip to chip, since -3 speed grade has a Fmax of 601.32MHz
Did you just modify the clock on fpgaminers code? I upped the clock to 450mhz and it was running stable at 70C. The chip is rated to 85C, what temperature were you at at 600mhz
Very minor mods.
I modified settings of the FIFO, and the Clock multiplier. I can PM you my vivado project. Moreover I implemented various implementation strategies to cherry pick get a good bitstream running stable at 550MHz+.
The temperature is between 30 to 45 C depending on the time of day. My KC705 came with a heatsink + fan though.