Viewnet now got stock. Must bundle with motherboard. Now gotta look elsewhere. lol

Never said specific model. Just "motherboard". You can call them.

the vrm is mediocre.
i suggest msi b450-a pro or tomahawk.

if it must be g.skill trident z then your 'cheap' options are limited.

cheapest might be this one (on lelong at least)
edit: cheaper on lazada, at least

Just make sure you have latest bios and chipset driver and you are good to go.

Another opinion is required from sifus!
soo I browsing along motherboard specs

ASUS ROG b450-F support only 3200Mhz (not gen 3 ready)

MSI B450 Tomahawk Max supports up to 4133Mhz ( gen 3 ready)

so if i bought a 3600Mhz memory, the asus mobo will underutilised it?
please make it clear for me, soo newbiee lahh.

*the tomahawk appearance looks soo empty compared to asus

Planned build
R7 3700x + 16Gb (8GB x 2 ) 3600Mhz

does asus b450-f support ryzen 3rd gen out of the box? or i need to flash bios?
didn't to flash bios, need previous gen proc 1st? or got bios flashback?
i'm excited to upgrade but also takut if things get complicated

what is your ambient temp?
mine is 28c ambient, hovering around 48c on 360 aio.

I think it is fine, it just an internal temperature of the cpu.. not the temperature of cooler's heatsink of your cpu.
btw, if your stock cooler Hi/Lo selection on the cooler hardware, u may set it to Low, since I don't think the fan speed affect the temperature much.. and while u r cpu is 100% run, it is far less noise at Low setting.

yes, for stock Wraith Prism  cooler.  at Low setting, it only make woosh..woosh sound at max speed.
btw, what most people annoying about is the fan speed crank up at cpu low load..
u can simply adjust the fan curve in the BIOS to  avoid that. just simply choose a fan speed maybe around 1500- to 2000rpm before 70c or 75c ,
and then straight jump to max speed after that.. ( so , what u see is a horizontal line and then a slash)..
u may do your own fine tune, I personally don't do that, and just use the same concept for all other aftermarket coolers . too lazy..

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For a stock cooler those temps are normal.

Yes you can always spend for a bigger air cooler, go for AIO or go custom loop. The lower the temps for Zen 2/3, the faster it performs.

Yes, absolutely change the thermal paste if you're going to change the cooler. It's conventional wisdom not to re-use thermal paste.

EDIT-
I suggest to use thermal paste that are not susceptible to "pump-out" effect, so higher viscosity paste like Gelid GC-Extreme instead of the typical low viscosity Thermal Grizzly Kryonaut.