From reading the guide, your CPU can't go over the 21 multi. Only in turbo boost mode can it. The amount depends on how many cores are active, 22X for 4 cores, 23X for 3 cores and etc. You overclock by down adjusting the multi and increasing the BLK.
To overclock, for example, 21 multi X 200 BLK = 4.2GHz.
It probably can't run at that speed.
So, you lower to 18 multi:
18 multi X 200 BLK = 3.6GHz.
Keep in mind, you might not be able to run at 200 BLK so you need to adjust that down too.
After sandy bridge, overclock became so much more easy with only needing to increase multi and adding more CPU voltage.