I don't have a 'multicore enhancement' setting anywhere in my UEFI right now. Running a single threaded benchmark allows all cores to stay at 4, with one periodically dropping to 3.9. Its strange that it does run the cores all at 4Ghz when there isn't much of a load (if I set the minimum CPU frequency in Windows to 100% this behavior is more obvious). This UEFI has an absurd number of options for a non-Z-series board, and I've tried increasing all of the turbo power target and other related settings, but nothing seems to change. So far, no matter what settings I choose in the UEFI, the most I can get it to do is to peg all four cores at 4Ghz when idle, but when there is a load they drop to 3.8.

This CPU will run at 4Ghz when one core is loaded. Namely, the ability to force a CPU to run all cores under load at its max turbo frequency. I have read about certain features being removed from various Haswell BIOS versions due to a microcode update. The board is currently running the 'Version 2001 7' BIOS. It is installed in an Asus B85M-G motherboard. I recently came into possession of an i7 4790 basically for free, so I swapped out the 4590 in my HTPC to get a little extra oomph and longevity out of the system.

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