I have i7 920 D0 processory with MSI pro-e x58 motherboard.
18 gb corsair xms dd3 RAM, zotac gtx 770
Cabinet - Coller master cm690
Q. 1) I am looking for a decent overclock of my processor at around 4~4.2 ghz and I wanted to know if the following cpu cooler is more than enough for it or not?
+1, the 920 doesn't get that hot except on the limit of it's overclocking headroom, it's the last .1 GHz that requires the bulk of the extra voltage and causes a spike in the heat. 4 GHz should be attainable with most 920s with a 212, 4.1 will be a huge struggle. But everything varies from processor to processor, although not as much as on later gens.