Can I use this cpu to replace my Intel Core i3-2100 Sandy Bridge Dual-Core 3.1 GHz LGA 1155 65W BX80623I32100 Desktop Processor Intel HD Graphics 2000?

The answer to that is on the specs page of your motherboard

Anyone able to explain why this is more expensive than the i7 6700k?!

It's a legacy CPU due to it being on Sandy Bridge and this CPU was $$ and retained its value. I own one and have been running it OC'd at 5 GHz for 3 years and its still rock solid.

Questions & Answers: Intel Core i7-2600 3.4GHz (3.8GHz Boost) Desktop CPU Processor - Newegg.com

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Intel Core i7-2600 - Core i7 2nd Gen Sandy Bridge Quad-Core 3.4GHz (3.8GHz Turbo Boost) LGA 1155 95W Intel HD Graphics 2000 Desktop Processor - BX80623I72600

32 nm Sandy Bridge
8MB L3 Cache
Intel HD Graphics 2000

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