zer0c00l587 :
You should note that, that particular i5 chip is actually a 2 core chip with 4 threads to give a quad core type performance. Traditionally with i-series chips were first released their difference were as follows:
i3 : Dual core with hyperthreading giving "4 core like performance" .....although technically speaking its a duo core. Also turbo boost.
i5 : 4 cores with NO hyperthreading with turbo boost as well.
i7 : 4 cores with hyperthreading giving you 8 threads almost like quad x2 and turbo boost.
That's true for desktop CPUs. Mobile CPUs have traditionally been:
i3: 2 cores, hyperthreading
i5: 2 cores, hyperthreading, turbo boost
i7: 4 cores, hyperthreading, turbo boost, 4MB cache instead of 3MB
Lately it's been muddied, first with dual core i7s (still with 4MB cache) being added. And now recently with quad core i5s being added. I would avoid the quad cores on a laptop unless you
know you need them because they typically consume 3x as much power and will severely degrade your battery life.
I can't find any comprehensive reviews of either laptop. But the main differences which stand out are the Acer has a nvidia 940m GPU, which should increase gaming fps by 2x to 3x over the Intel GPU. The HP has got a DVD drive. Also, its SSD is in a M.2 slot, but the laptop also has a 2.5" drive bay. So you could always buy and add a HDD in the future and run in a SSD + HDD config if you need the extra storage space. Based on the reviews, the Acer looks like an either/or deal - you can have a SSD, or a HDD, not both.
So if you plan to play games, get the Acer (a 940m isn't exactly a strong GPU, but it should handle modern titles at 1366x768 resolution). If you need additional storage but still want a fast and responsive drive, get the HP.