hI, kaefers
One suggestion that might work: Try removing the CPU from the socket, inspect the socket pins, then reinstall the CPU. When installing the Kraken waterblock, tighten it snugly, but not too tight. The point is to let any socket pins that moved off the CPU contact point to get back in place. Excess pressure from a cooler is one likely cause for misplaced pins, and the pins can move over time.
One totally wild possibility is in BIOS Extreme Tweaker tab > Tweaker's Paradise > PCIe Tuning > PCIe Clock Amplitude. You could try to adjust that a few steps either side of 0 to see if it makes a difference.
Otherwise, the CPU is much more likely failed than the M6F since there are no active components between the CPU System Agent and the PCIe sockets. Bent pins in the PCIe socket being the only likely board issue. What Vcore does the 4770K need for 4.5GHz? Looking for CPU degradation here - voltages over some value between 1.35 and 1.45, depending on the Haswell lottery, will lead to slow reduction of performance in the CPU. In fact, success at the clock amplitude tweak may indicate a little degradation. It's probably safe with Vcore below 1.3 and Vccsa below 1.15.
Jeff
One suggestion that might work: Try removing the CPU from the socket, inspect the socket pins, then reinstall the CPU. When installing the Kraken waterblock, tighten it snugly, but not too tight. The point is to let any socket pins that moved off the CPU contact point to get back in place. Excess pressure from a cooler is one likely cause for misplaced pins, and the pins can move over time.
One totally wild possibility is in BIOS Extreme Tweaker tab > Tweaker's Paradise > PCIe Tuning > PCIe Clock Amplitude. You could try to adjust that a few steps either side of 0 to see if it makes a difference.
Otherwise, the CPU is much more likely failed than the M6F since there are no active components between the CPU System Agent and the PCIe sockets. Bent pins in the PCIe socket being the only likely board issue. What Vcore does the 4770K need for 4.5GHz? Looking for CPU degradation here - voltages over some value between 1.35 and 1.45, depending on the Haswell lottery, will lead to slow reduction of performance in the CPU. In fact, success at the clock amplitude tweak may indicate a little degradation. It's probably safe with Vcore below 1.3 and Vccsa below 1.15.
Jeff
