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Copying over my original article: How to OC the M17x-R2 using SetFSB: Background information I'll start with how I figured it out: 1. I saw the Asus guys unlock their bclk using setfsb and figured the PM55 can't be too different from the HM55 and decided to give it a shot. The first step is to download SetFSB, switch the clock generator to ICS9LPRS365BGLF, click GET FSB and let it populate the addresses. 2. I realized Dell already gave us the keys to OC'ing the BCLK in the bios so I started by setting my system to default and doing a capture of the addresses setfsb spit out. I then incrementally increased the OC from 1-5% and observed the changes in the offsets (see attached photos). Here's the notes I made last night when testing all this: 3. The key thing to realize is that once you enable overclocking in the bios, offset 00h switches from 21 to 29, 0C to 20 and both stay that way for the duration of BCLK manipulation. The other two offsets that always change are 0F and 10. What I found is that if you lower 0F from 98 to say 95 and leave 10 as is (default is 34 when OC'ing at 5%), it raises the BCLK. Likewise, you can put 0F at 98 and incrementally raise the BCLK by increasing the value of offset 10 from 31-39 (it locked on me at 40). So in summary 1. Download and turn on SetFSB 2.2 (freeware version) 2. Switch to clock generator ICS9LPRS365BGLF 3. Change offset 00h to 29, click update and apply. Change offset 0C to 20 and click update/apply. 4. The other two offsets (0F/10) are the ones that let you manipulate the BCLK as high as your system will allow and so 0F can be changed to 98-95/18 and offset 10 can range from values 31-39. This method of BCLK overclocking has been shown to work with non-extreme CPU's that range from the 520M all the way up to 840QM. Please note: If SetFSB does NOT show anything in the registers for your machine, it's because you need to do the following: Step 1) change windows font resolution from medium or large to normal(in the control panel under font sizes) . Step 2) adjust registers because SetFSB can't reproduce large font sizes!!! Images to reference offset changes from 1% to 5% (red=changed offset, green=offset unchanged): Changes in offsets at 1% Changes in offsets at 2% Changes in offsets at 3% Changes in offsets at 4% Changes in offsets at 5%