- Best web browser 2020: Chrome, Edge, Firefox, and Opera go head-to-head We take a look at the performance and features of the big four internet browsers to see which one will serve you best.
- 64-bit browsers are worth using – regardless of whether they perform better – for one simple reason; they are more secure than a 32-bit browser ever can or will be. Even something that has become as common as ASLR is worlds more secure with a 64-bit program thanks the larger virtual addressable space, making it far more resistant to heap.
You may have heard about Windows RT vs Windows 8. They're, like, almost the same, but also really different? It's confusing. Well, here's the difference:
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Windows 8 can only run on x86/x64 processors. Windows RT can only run on ARM processors.
Cool. But why does x86/x64 vs ARM matter? Why does each processor require different versions of Windows? Let's drill down.
x86/x64 processors: They're fast and powerful, but they require a lot of electricity. So, they're used in desktop computers that can plug into the wall. All versions of Windows run on x86/x64.
ARM processors: They're weak but low-power processors for smartphones and other devices that aren't plugged into the wall. Mobile iOS and Android operating systems run on ARM.
The two processor architectures are mutually exclusive: a program that's built for x86/x64 can't run on ARM under any circumstances, and vice versa. About mac os x.
Since the 90s, these architectures have existed in parallel worlds: ARM for phones and small PDAs, x86/x64 for desktops and big laptops. But in the past few years, the market's gotten all hot and bothered for tablets that are bigger and more powerful than phones, but simpler than laptops — like the iPad or Kindle. Tablets have to be small and light, which means tiny batteries, which means ARM processors. But tablets have USB ports, full web browsers, and word processing and photo editing apps, which means ARM-based portables have become direct challengers to x86/x64-based desktops.
Windows has always been a desktop-only operating system, so it's only been available for x86/x64 processors. But Microsoft sees everyone moving to tablets, and it doesn't want to lose all its future revenue, so it entered the mobile arena with Windows RT and the Surface. [update 2016: Windows RT sorta failed and the Surface is becoming a brand for x86/x64 processor powered laptops, with the Surface Pro and Surfacebook]
x86/x64 processor manufacturers are potentially the most harmed by the rise of tablets. But there's an easy way for them to stay relevant — make an x86/x64 processor that's low-power enough to place in tablets. Intel's doing that with the Atom processors, which give up processing power, x64 support, and high-speed computing features like SSE in return for super-reduced power consumption.
BUT. GET THIS. Atom processors still can consume 2x the electricity of an ARM processor, even at the same processor count/clock speed. What?
Well, it's because of an inherent difference between the processors. See, 'ARM' stands for 'Advanced RISC Machine'. RISC stands for ‘Reduced Instruction Set Computing', and, befitting an acronym that's part of your entire brand name, it's what makes ARM so low-power.
You may remember that the instruction set refers to the set of commands that the processor can execute. Well, most code only requires a few instructions — read/write memory, do arithmetic, jump, boolean logic, not much more. ARM processors only offer these basic instructions. Thus, a reduced instruction set.
x86/x64 processors are CISC, or ‘Complex Instruction Set Computing'. Although almost all code can be represented by the basic instructions in RISC, certain patterns of instructions are common — for instance, 'write this byte to memory then look at the immediately following byte'. CISC processors offer combo-instructions (previous example being STOSB) that handle these common instruction patterns super-efficiently. However, support for these combo-instructions requires extra hardware — and that hardware costs electricity.
That difference in hardware is why ARM processors use less power than x86/x64 processors at the same clock speed. Mind you, it also means that some programs run faster in x86/x64 processors than they do in ARM processors with the same specs — an algorithm that takes 3 cycles on an ARM processor can take 1 cycle on an x86/x64 processor if it's been wrapped into a CISC combo-instruction. It's also why programs built for x86/x64 can't run in ARM — once you compile a program for x86/x64, it's hardcoded to use these combo-instructions, and there's no translation to ARM from there.
So what do the specs of two similar-release-date processors look like? Let's compare the ARM AM3359 and the x86 Atom Z650.
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ARM AM3359 | Atom Z650 | |
INTRODUCED IN | Q3 2011 | Q2 2011 |
# CORES | 1 | 1 |
CLOCK SPEED | 720MHz | 1.2GHz |
L1 CACHE | 64KB | 56KB |
L2 CACHE | 256KB | 512KB |
POWER CONSUMPTION | 0.7W | 3W |
The Atom Z650 is definitely more powerful, with a 67% clock speed increase — but it consumes over 400% the electricity. That said, it theoretically could run a program over 4X faster than the ARM AM3359, if that program uses a ton of CISC instructions.
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All the same, I'd eat my whole Beanie Baby collection if a real-world program can get more than a 2x speed increase. And that's a lot of Beanie Babies.