I was just wondering because my laptop I have is a 4 core 8 thread laptop and this ultrabook that I'm using right now has only 2 cores 4 threads
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Yep. All mobile Core i5 CPU are dual core CPUs with Hyper Threading.
The only quad core Intel mobile CPUs are the Core i7 with the "QM" designation. If the i7 only has the "M" designation, then it too is a dual core CPU.
This is usually how it goes for mobile cpus :
Intel Pentium G -- Dual Core - no HT - slower than Core i3 Intel core i3m = Dual core only - no HT Intel core i5m = Dual core - can be with HT or without HT Intel Core i7m = Dual core with HT or quad core for QM models.