Originally posted by vladpetric
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How A Raspberry Pi 4 Performs Against Intel's Latest Celeron, Pentium CPUs
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Originally posted by starshipeleven View PostThere are custom ARM designs from AmazonLast edited by CommunityMember; 07 August 2020, 08:47 PM.
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Originally posted by starshipeleven View PostARM is an architecture that is supposed to scale up into the high-performance too.
The Raspi and embedded devices in general are designed to be efficient, but there are high-end ARM CPUs that really need a real heatsink.
Originally posted by starshipeleven View PostThat guy is talking about SPECIFIC CPU core designs from ARM (the ones that are licensed to third parties) being inferior, which is at least somewhat believable at face value.
You are just assuming a whole architecture/ISA is the same just because it has the same interface for software, which is complete bullshit.
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Originally posted by starshipeleven View PostThere are custom ARM designs from Amazon
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During the summer, it's just too damned hot to use anything other than my Raspberry Pi for computing. I don't care how much more performant an Intel x86 might be, the Raspberry Pi manages to play video, browse the web, and let me write code without breaking a sweat. The Pi not only saved me a few bucks in purchase price for a new computer, but on-going it is saving me a ton in electricity for running the A/C.
It also seems to be a lot more reliable. My old Intel quad core laptop will occassionally spontaneously reboot, while my RPi4/4GB has pretty much never done any crashing, aside from Out of Memory situations (which isn't really a crash per se, but Linux gets so slow when it runs out of memory that it might as well be locked up).
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Originally posted by vladpetric View PostUnfortunately the microarchitecture of the RPi4 is still a bit of a joke.
I've had a lengthy (and peppered with the occasional insults, of course) discussion earlier on phoronix forums.
It's not just the clock speed. The IPC of the RPi4 is mediocre.
The RPi4 chip (Cortex A72) doesn't have a proper Load Store Queue, to allow it to issue loads out-of-order with respect to earlier stores (so all prior stores need to complete before issuing a load). This would require machinery to detect and correct potential misspeculations, of course.
It can only decode 3 instructions per cycle, and issue 5.
Actually the venerable Alpha 21264 from 1996 had better microarchitecture. Granted, that was a trailblazer chip, but still ... 1996!
So, this is not about nm. It's about a toy microarchitecture.
This is one reason why I'm very interested in what Apple delivers as far as a performance ARM processor goes. Hopefully we can see what ARM can do as a mainstream processor then.
Frankly I'm a bit disappointed that Micheal didn't spend more effort to configure the intel machine like the Pi. That is minimal RAM and slow SSD. On the other hand I really doubt if the PI even comes close to the power usage of the Intel beast.
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Pi 4 is a toy no doubt, but it is a toy that can run a full desktop, and drive two 4k display (though at 30hz).
Many low end laptops can't do it.
It is a great toy to play. And a lot gadgets now is powered by similar ARM SoCs.
I put SSD on the USB3 port and it becomes quite good for practical use now.
It will get better also. But I don't expect it to be close to or even just half fast as mobile CPUs from Intel or AMD.
Apple will have fast ARM SoC but they will never publish it or even allow anybody else to use it.
Right now pi4 is quite good for me. Maybe in future a toy Pi5 Pi6 with same power consumption and a little faster will be more attractive.
But I really won't expect it to double the performance and maintain same power profile.
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Originally posted by wizard69 View PostThis is one reason why I'm very interested in what Apple delivers as far as a performance ARM processor goes. Hopefully we can see what ARM can do as a mainstream processor then.
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Originally posted by herman View PostA Pi 4 is not a serious desktop replacement, but for a budget SOC, it's actually coming close enough to Intel that we benchmark it. The real test will be Apple's silicon. If that can get competitive performance, then it will only be a matter of time before other manufacturers switch to ARM-based products.
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