I'm deciding between which used MBP to buy, and yesterday, it was brought to my attention that older i7 MBP's may not actually be quad core. If you look on the official Apple Specs page (How to identify MacBook Pro models), Only the Early 2011 and newer MBP's have "Quad Core i7" processors, and the rest are just "i7". I also checked a benchmarking site (Mac Benchmarks - Geekbench Browser) which confirms this, and the pre-2011 MBP's with faster clock speed i7s are showing significantly lower benchmarks than the 2011-on MBPs. However, when I google the model of the processor, on sites like NewEgg, it states quad core, so I'm hearing both sides. What is actually the case here?