Intel i7 dual core vs quad core?

I have recently been searching for somewhat high-performance laptops. I've been looking and looking, and everytime I find a good deal for decent specs, there's some sort of catch. There was these two laptops I found pretty recently but I'm pondering whether I should purchase one or the other.

Cheaper one
Specs: Intel Core i7-3520m, 2.9 GHz (3rd gen), Dual-Core, 8GB (RAM) 500GB (HDD).
More expensive
Specs: Intel Core i7-2620m, 2.7 GHz (2nd gen), Quad-Core, 8GB RAM, 500 GB HDD.

Everything seemed better for the cheaper one, except the number of cores were not specified. I contacted the seller, and they told me the laptop had only 2 cores. That immediately lowered my hopes. But now I'm starting to think it's actually not that bad. The "more expensive" one is, in terms of specs, worse. I'm not sure if the two extra cores will provide much more of a performance-wise advantage to me. I just need a laptop powerful enough to do mid-range gaming (Counter Strike, Minecraft, Call of Duty, etc.) and frequent surfing of the web. A bit of video processing in there, too. I have already seen multiple other laptops but they didn't fill my needs.
So, which one do you recommend?
Links:
Cheaper one
http://www.ebay.com/...1803757872
Expensive
http://www.ebay.com/...1809544753

Daniel 24.07.2015

Neither of these laptops have dedicated graphics cards, so your gaming choices will be limited if it requires plenty of dedicated VRAM.

But… Neither of these laptops have a quad core processor. I wouldn't trust the more expensive one very much.

The Elitebook has the better processor, thanks to same amount of cores and a better architecture with a similar clock speed. Benchmarks also show that it has a bit of a better performance.

Therefore, that cheaper one is actually superior in performance.

Remember to just google search for the processors on computers and compare them on websites like cpu-world, Cpu boss, game-debate, and for specs, compare on intel's ARK site.

Edit:

I forgot to mention, the integrated GPU on the Elitebook's i7-3520m is also much better (probably 50% better performing) than the one on the Latitude's i7-2620m. This will come in handy on games that both are actually able to play.

I know of some games you may be able to play, too. You could probably do: Napoleon Total War, Shogun 2, and Empire Total War each on low-medium settings, Minecraft on high settings (I recommend optifine and turning off certain effects), Star Wars Empire at War (this game isn't well optimized), Spore, Universe Sandbox, and Star Wars Knights of the Old Republic 1 and 2 (medium-high settings since the engine isn't great).

PeopleHateMyOpinions 24.07.2015