First off, the 2500K does NOT support hyperthreading.......you have 4 cores/threads. Leave Hyperthreading alone.
BCLK is 100MHz by default.....fiddling around with this number without knowing what it does is a recipe for disaster.
Here is a direct quote from a Z77 Overclocking Guide on BCLK:
BCLK Frequency: This function becomes available if X.M.P or Ai Overclock Tuner “Manual”
are selected. The base BCLK frequency is 100MHz. The CPU core frequency is derived via
multiplication with the Turbo Ratio setting (final frequency is displayed at the top-left of the Ai
Tweaker menu). BCLK also adjusts memory operating frequency in association with the
applied memory ratio (Memory Frequency and CPU bus speed: DRAM speed ratio mode
Bear in mind that the adjustment margin for this setting is not large - most processors have a
range of 7 MHz +/- the base frequency, although there are some processor samples that can
I would generally leave this alone unless you absolutely know what you are doing. If you want to bump up performance of your CPU, it is unlocked.......you can change the multiplier and get a higher clock speed. I would hoever, read up on overclocking so you have an overall better experience.
If you would like a copy of the Z77 OC'ing guide, PM me and I will send it to you.
I would ditch the RAM upgrade and go with a nice SSD if you don't already have one in that machine. You will see a 0% gain with 32GB of ram more than likely. With an SSD, you will see an increase in performance every time you open up a program, install programs/applications, and starting up/rebooting. Single best upgrade there is, in my opinion.