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The "KB" processor refers to Intel's newest 7th generation processor family known as Kaby Lake. The previous sixth generation processor family is known as Sky Lake. The processor in this particular laptop is the Intel 7200U, a dual core CPU with hyperthreading that allows for up to 4 command threads to be processed per clock cycle; two physical cores, and two virtual cores (hyperthreaded). The 3MB of cache on the 7200U is also the fastest and most efficient yet that Intel has developed to better harness the new Kaby Lake architecture. The "U" stands for ultra efficient power usage, which means it has the best performance and the best power management by having a Thermal Design Power (TDP) rating of only 15 watts! That efficiency is what allows the 7200u to achieve 4-5 hours of battery life with just a two cell lithium-ion battery. The integrated graphics processor within the 7200U is known as the Intel 620 and is the newest integrated graphics processor (IGP) by Intel and is capable of full 4K @ 60Hz playback of videos and even video games, though I will warn you that the 620 is definitely not capable of rendering 3D games at playable frame rates at 4K resolutions, so the main reason to have it would be if you intend to hook the laptop up to a 4K UHD TV and play back 4K movies you filmed on your smart phone. Since almost all 4K UHD TVs have the 'smart' functionality, there isn't as much need to have 4K playback capability on this type of low end laptop. There are gaming laptops that are capable of rendering games at 4K with no issues, but those are way more expensive. Since the native resolution of the laptop screen is only 1366 x 768 (HD), the only way to output 4K resolution on this laptop is through the use of the HDMI port. Also, note that the Intel 620 IGP requires the sharing of the main system memory, so keep that in mind when you are multitasking using several different programs and watching videos ;-)
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