Monolithic die vs chiplets+huge IOD, that's the trade off for both designs.

Also understand that 5900x has 50% more cores and threads than the 9900k. Idle power consumption is bound to be higher.

I will say not that bad considering lowest clock only down to 3.3GHz in idle. Would be better if can lower to sub 1GHz in idle, for sure that is going to help on idle power.

My swap from Intel to AMD decision happened within 12 hours last week without really keep up with AMD Zen design since 2 years ago, let alone those in depth details. All i known was AMD rule the high end segment now without answer from Intel.
So basically i left no choice when my motherboard dead on me suddenly (I thought is motherboard end up is 1 of 4 RAM stick fault after swapped to AMD, what a costly mistake ).

I try to pickup everything within a week, PBO, curve optimizer, architecture etc. and start to learn there are quite alot of drawbacks of AMD platform as well, both on the processor and chipset as well, especially memory latency side and memory clock limitation wise.

Currently my rig looks stable in everything, all/single core boost is satisfying, except a crappy cold boot issue of my board, and this is a famous issue online for Asus Rog Strix B550-E series with DOCP enable, consequences of not doing enough homework before land for this board.

But i really love the AMD's idea of PBO, Curve optimizer. This is really easy and good provided nowadays you won't get any meaningful overclocking at the top end chip in both Intel and AMD.

But, am i hit the silicon lottery? because i don't find many chip that can reduce all core to -30 in CO like i did.

To me basically Intel is dead after i9-9900KS, the efficiency doesn't make sense in full load.
Imagine my CPU core temp is @ 96-98'C even with my custom loop.
So i know AMD is the only way can go if i want something immediately.

This AGESA bios is something really missing in HW review everywhere. I always read HW review like Toms, TechpowerUp, Anandtech etc., but no one mentioned all the weakness but just end up with 'highly recommended' 'gold award'...So it give an impression to me AMD is 'perfect'. (me too native huh).

Regarding the cold boot issue, i'm not going to fix it as i will just left my rig to standby/sleep 24/7 without plug out AC will do. Or i can disable DOCP before i do so sometimes like away from home more than few days.
With that money, i should have go for Gigabyte B550/570 Aorus Master rather than this Asus crap if i'm not prejudice due to my misjudgment last week (i thought is 3rd time the same board failed me). I lost the front QC3 USB charge, back panel clear CMOS button, onboard reset button by changing from my Z390 Aorus Master to this Asus B550, those are quite useful/important features for me.

Anyway, is this cold boot issue widespread in AMD platform but not Asus alone? Changing motherboard is one of my thought last week, but scraped after further survey, basically left no choice and stuck with this, not worth it for such tiny cold boot issue.

Haha, I totally lost in RAM memory chip, and i don't think seller disclose the information (they don't even know maybe). So i just choose whatever capacity i want with reasonable speed (3200MHz is baseline).

My RAM stick just went for RMA yesterday and stuck with 32GB with me now, at the same time i just ordered 2 x 32GB GSkill Trident Z Neo 3600 due to my work nature need for electronics/CAD simulation, so min 64GB RAM is needed.

I don't know whether the cold boot is Asus limited or widespread as AMD platform, but solution for Asus is:
1. Run the speed 1 rank lower than rated XMP. 3600 -> 3200 etc..
2. Change the CL from rated to few clock lower. CL16 -> CL18

Both are HELL NO solution to me, is not end of the world by put my rig standby in full time rather than to sacrifice the RAM performance.

I didn't manual overclock my RAM at all, what i did was enable the XMP profile (Asus called DOCP) only without adjust any timing manually, not stable?   I have use that RAM with my Intel rig for more than 1 year without any issue.

Just to be sure, many Asus user use their QVL RAM also facing the issue.

5 loops without issue. Or need more?

  Haiz, so damn much constraint...will just sell it if really not working well. Hopefully Intel can bounce back anytime sooner. (I doubt so)

typical fan header provide 1 Ampere, if both of your fan draw more than 1 Amp (eg one is 0.5A and one is 0.7A), they will slow down.
most pc fan dont draw that much, 0.5a fan is usually high speed fan, 1A is server fan and 3A is ~6000 rpm fan that will create black holes in your pc

After my first experience of that, now I turn the cooler left and right first before I pull it out. No more pulling the CPU out.

Before you shutdown and take out the cooler, just remember to fire up the prime95 stress test for 20 minutes to cook the thermal paste such that it become soften.

main proof that you are noob is that you keep asking about bottlenecking

with a 3080ti, you are going to hit 60-100fps consistently in all or most games at 1080p and 1440p anyway.
even with just a r9 290, i can hit 50fps in most games i play at 4k.

if you are getting 100fps with a 3700x, while your friend is getting 120fps with a 11900k.
both guys are playing at 1080p, then you are just being pedantic.

my point is at 100fps, does it really matter? 

Thanks appreciate it. Whilst FPS matters to me because I tend to play a bit more competitively (just by nature), it is mostly for 1440p. Right now, I can't get a stable 144FPS (currently averaging around 110-125FPS at 1440p) whilst compared to my friend with the 5600x CPU and the 3080 GPU, he gets about 150-160 FPS (with exactly the same settings and 1440p monitor). Personally, I feel that just because of the CPU that I am missing out and was thinking of initially just swapping out the CPU. Haven't made the decision yet to do it as due to work commitments, I don't have the time to play FPS games at the moment.

General rule:

Tier 1 gaming CPUs:
Ryzen 5000 (preferably non-G)
Intel gen11 Rocket Lake
Intel gen10 + B560 chipset (budget build option)

Tier 2:
Intel gen8/9/10 without B560 or Z series chipset
Ryzen 3000

Tier 3:
Ryzen 4000/2000/1000
Intel gen7 and earlier

Ryzen 3000 used to be tier 1 budget options, only because of the lack of B560 chipsets and higher Intel CPU prices earlier making them less price competitive.

Its not ryzen or mobo issue. Its about windows & radeon card. Especially RX580. Now im using adrenalin 21.1.1. Latest one will got driver timed out every few second.

Yeah, i suspected this as its managed to survice occt and memtest for hours. I'm using a 3500x and apparently it says made in china, so i could suspect degrade issue or bad waffle.
I've tried revert to stock on bios and no pbo, ram stock at 2666 no xmp enabled. It will random black screen on me. Sometimes just 2 hours after a reboot sometimes couple of days. Temps are ok. It does that on some idle, tried bump cpu volt by 0.1v, didn't help. Note: Motherboard has some heatsink over its VRM.
Yeah, it appears to be listed as qualified but not sure if the one they tested are the early batch but not the recent once since Ryzen B450 has been available for quite some time already.

It sometimes gets on my nerves, when it tries to restart when doing web browsing.

since u mention "idle" got issue , so increase the "CPU LLC"  to "medium" shall ease your problem.
if my memory serve me right ,  it was tested at  AGESA ComboAM4v2PI 1.0.0.2 , but I guess it shall work in newer AGESA either.  (please don't suka suka flash your BIOS , unless  your mobo have dual bios or flashback function).

there are some other ways , but I think CPU LLC is the only way I would suggest anybody to try . more easier and less risk  , if comparing to others .

p/s: if u google "amazon" "new world" "crash" "rtx", u may see some RTX cards die ,coz of playing this game, shall we blame "Nvidia" or "game developer" ?  or just "EVGA" only?? different person may have different opinion...  (I knew it is not related to your problem, I just saying, I guess u got the point)     

It is ticking my nerve to switch platform, while i can keep my M.2 SSD and DDR4. I've tried update Bios, it didn't work. Currently on further observation.
I did clean install after the problem starts to arise, and it still crashes from time to time.

Actually don't have high hopes for their 3D v-cache either. Zen 3 is complicated enough as is, just tacking on massive amounts of L3 isn't going to alleviate the problems it already has. This is just a stop gap for AMD so they can have something to compete with ADL (eventhough it's a futile attempt) so that they have a buffer before launching Zen 4.