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Thread Starter 
Hi everyone,

I have an i5 3570k CPU and an Intel DH77DF motherboard (ya, this board doesn't let me adjust the unlocked multiplier unfortunately =() but it DOES let me adjust the BCLK/bus speed, whatever you youngsters call it nowadays.) And I used to be able to overclock my CPU this way, as you might expect; I'd set the BCLK to 105MHz in the bios, boot to windows, and CPU-Z would register the CPU clock speed correctly: The adjusted BCLK of 105MHz x the multiplier. Not the greatest overclocking method in the world, but I was very happy with it given my hardware limitations.

About a week ago, I noted my CPU was no longer overclocked. I went into CPU-Z, and found that the BCLK was set to 100MHz and wouldn't change. I checked the BIOS next, and the BIOS was still reporting the BCLK speed as 105MHz, like it should be. Went back to the OS, and found that the BCLK was back to 100MHz. Huh.

I tried everything; resetting optimal BIOS defaults, screwing around with BIOS settings, reinstalling motherboard chipset drivers, unslotting/reslotting CMOS battery, and even reflashing the BIOS. But, alas, none of that fixed the problem.

I can set the BCLK in the BIOS to whatever I want and it won't remain overclocked as soon as the OS boots up. I'd like to clarify that the BCLK speed in the BIOS ALWAYS remains at what I set it at; it's only the BCLK reported by the OS that remains at 100MHz.

One additional tidbit of information that may be useful is that the BCLK is the only feature in the BIOS isn't working. I can change any other feature in the BIOS and that change will be applied when I boot up the OS, so it's not like the BIOS is using optimal defaults every time and ignoring any changes I make.

So, ladies and gentleman, I am stumped. I work in the tech industry myself and part of my job is sometimes fixing all sorts of computer/server related issues, but this time I am at a complete loss. Does anyone have any idea what's going on and how I can fix it?

Thank you for taking the time to read this.