I wasn't able to adjust any of the turbo boost options either. It seems to be fixed at 30 for non turbo boost. I have found some time to reboot and have a look in the BIOS and it does indeed seem that the multipliers have been lowered - although I can't turn them up again. Sorry for the ugly post, looks like doesn't show up in a fixed-width font after you post) Does anyone know why the processor is running much slower than its rated speed? I'm running this in an Intel DH87MC desktop motherboard, and temperatures rarely go over 60 degrees even under full load so I don't think it's a thermal problem. $ cat /sys/bus/cpu/devices/cpu0/cpufreq/cpuinfo_max_freq

Model name : Intel(R) Core(TM) i7-4770K CPU 3.50GHz Max TURBO Multiplier (if Enabled) with 1/2/3/4 Cores is 32x/32x/31x/30x

Max Frequency without considering Turbo 3091.73 MHz (99.73 x ) TURBO ENABLED on 4 Cores, Hyper Threading ON Why would this be, when it is marketed as a 3.5GHz processor with the ability to Turbo Boost up to 3.9GHz? The Linux cpufreq information tells me that the processor is reporting its maximum speed as 3.2GHz. compiling in parallel) it stays at 2.992GHz, and when it is idle it creeps up just above 3.1GHz, but never goes any higher. I'm running Linux, and I have noticed that my i7-4770K CPU never goes above 3.2GHz.

How to enable turbo boost i7 4770k