what is M3 processors? is it same as I3,I5,I7 or is it different?

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Whether it's "lowest end" depends on what you're doing with the laptop. The M3 is actually equivalent to a dual-core i7 (as your link shows). Just with a really low TDP.

The low TDP means it can't keep up with an i5 or even i3 on extended processing tasks (more than, say, 5 seconds). TDP actually refers to the cooling Intel says to connect to the CPU. The fan (or passive cooling - some M3 laptops are fanless) isn't able to keep it cool in extended processing, and it starts to thermal throttle.

But for short bursty tasks (not enough time for the CPU to heat up substantially), it will...

Whether it's "lowest end" depends on what you're doing with the laptop. The M3 is actually equivalent to a dual-core i7 (as your link shows). Just with a really low TDP.

The low TDP means it can't keep up with an i5 or even i3 on extended processing tasks (more than, say, 5 seconds). TDP actually refers to the cooling Intel says to connect to the CPU. The fan (or passive cooling - some M3 laptops are fanless) isn't able to keep it cool in extended processing, and it starts to thermal throttle.

But for short bursty tasks (not enough time for the CPU to heat up substantially), it will actually out-perform an i5 with the same clock speed due to the extra cache. So for tasks like web browsing and Word/Excel, it's actually a pretty decent processor. Just expect it to suck if you're gaming or encoding videos.
 
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