I saw that there is a new major iso release with code name 'Spotted Eagle', which introduces a lot of changes. I know ArchLinux is a rolling release distro, but I really want to know: will I need to reinstall my system to get those changes working? Or I can just run sudo pacman -Syu and then get all of the changes working?
Most of the changes will affect automatically, but some you need to do manually.
My handy trick:
(credits go to various stackexchange posts)
WARNING: May or may not work and could break the system .
curl https://builds.garudalinux.org/iso/garuda/dr460nized/210507/garuda-dr460nized-linux-zen-210507-pkgs.txt | grep -Eo '^[^ ]+' | paru -Syu --needed -
(dr460nized, 210507 and garuda-dr460nized-linux-zen-210507-pkgs.txt may vary)
And then, change "paleofetch" to "neofetch" in .config/fish/config.conf if you want
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Thanks for handy trick.
However, pacman -Syu was enough. No package to update or new packages to install.
It entirely depends on what you want. You can just run pacman -Syu if you are satisfied with your current setup however you could also do as proposed and follow the changes which happened during the last few months if there is a new feature which seems useful and cant be reproduced on your own.
Thats the beauty of rolling release, you are the one choosing if you want to follow along or not, without being forced to reinstall 
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Only if you want to be an ISO tester. 
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Hey, I just found something interesting... I just installed Zorin OS to test it out, you know. And I found that my CPU is running at 800 MHz, max 4.1GHz clock on Zorin, but in Garuda it runs at 2.1 GHz, maximum 2.1 GHz. I don't know what happens, or what will it bring to me (higher or lower performance). If anyone have the same situation like me, can you tell me what it going on?
Here is the output of inxi -Fxxxz on Garuda:
CPU: Info: Dual Core model: Intel Core i3-10110U bits: 64 type: MT MCP arch: Kaby Lake note: check
rev: C cache: L2: 4 MiB
flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 20799
Speed: 2100 MHz min/max: 400/2100 MHz Core speeds (MHz): 1: 2100 2: 2100 3: 2100 4: 2100
I will posting the output of Zorin OS soon.
EDIT: Here is the output from Zorin OS.
CPU: Topology: Dual Core model: Intel Core i3-10110U bits: 64 type: MT MCP arch: Kaby Lake rev: C L2 cache: 4096 KiB
flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 20799
Speed: 800 MHz min/max: 400/2100 MHz Core speeds (MHz): 1: 800 2: 800 3: 800 4: 800
New "problem" new topic after search by your own before posting.
Read
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Sorry, I will open a new topic now.