A year ago people where asking, quad core laptop or duo core laptop. Things have moved on and the current, latest and greatest, is Core i7 laptops.  The Intel Core i7 is the successor to the Intel Core 2 brand. The current models still use 4 cores so it is still technically quad core laptops, but will soon utilize up to 6 cores, all of them hyper threaded.

The geek stuff.

The mobile version of the Core i7 has 6-8 MiB of layer 3 cache. It uses a uPGA-989 socket with minim feature size of 42 nm. The TDP is 45-55 W.

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