I don't have links but I researched this when I bought my 2500k and my conclusion was that for my overclocking needs, it would be pointless vs. the advantages I would lose. Since I wasn't going for a world record overclock, rather I wanted a stable 4.5 on air (either will do just fine). "Really the Intel® Core™ i5-2550K is there to help us meet demand for the Intel Core i5-2500K. In the enthusiast space the Intel Core i5-2500K is by far our best selling processor. Even at a company like Newegg.com they have had days where they have run out of stock. We have heard from a number of performance users how they don't need the IGP (Integrated Graphics on Processor) so this allowed us to release this processor.
Christian Wood
Intel Enthusiast Team" from
http://www.tomshardware.com/forum/327110-28-2500k-2550k
The 2500 and its integrated graphics will allow you faster vid conversion, and best of all, you still have a screen to look at if you ever have trouble from your video card.
I also use it to run a 3rd monitor. 1 in the iGPU and 2 in the 560Ti.
overclocking records:
http://hwbot.org/hardware/processor/core_i5_2500k/
http://hwbot.org/hardware/processor/core_i5_2550k/