Ummm… Even under a Blender workload with a R9 3950X, there are some B450 boards that CAN handle it, including the Tomahawk (you know, the one people have been going crazy for?).
Buildzoid’s input on boards for the 3000 series:
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I don’t know why people rave about PCIe4 so much. The only area where it makes a difference is storage and high-end server GPUs.
Unless AMD goes mad and forces CrossFire back into peoples systems, why bother?
I wait for Intel to panic more. That confirms speed increase more than anything.
“Can handle” and exceeding 100°C (or even reaching 125°C) are different things.
See this video after the 6 Minute mark.
PCIe 4 was a marketing gimmick to make Intel look bad. GPU cannot really take advantage of the addition bandwidth, but the masses don’t realize that the fancy numbers don’t actually come with any real world gains. looks good tho. 
storage can benefit but that’s only for the niche subset of content creators who need the bandwidth for their video. enterprise would obviously benefit as well…but adoption for this kind of thing in that space is slower.
there are also a number of premium B450 mobos with good VRM.
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Please try to pay attention. Yes, the Gigabyte in the LOW airflow situation is 3 degrees from 100c while the ASUS is unforgivably 100c+. HOWEVER, the MSI Tomahawk is 87c. With a fan blowing directly over the VRM, nothing hits 90c, and the Tomahawk has an even larger lead of 66c compared to the next highest 80c.
It’s true that Gen 4 doesn’t matter for consumer GPU applications today. But it’s not a gimmick. Having Gen 4 also enabled MOBOs to have more Gen 3 lanes overall—which is useful for those who have more than just a GPU installed
Bandwidth is higher, yes. But you can’t just make Gen4 into Gen3 and have more lanes 
PCISIG would like to disagree.
Xilinx and AMD-GPUs support it and in case of the Xilinx stuff, NEED the bandwidth.
The fact Intel is dysfunctional from management to janitor is not helping the computer landscape…
Most capacitors on the B450 boards are 85C rated 5000 hours.
And now be honest here, how realistic is that?
Open air bench, fan pointed at VRM, GPU idle.
Take a case with blocked front intake (tempered glass, F yeah!), slap a 1080(ti) or 2070 (or higher) in there, add 240AIO and there is close to irrelevant airflow in the socket area.
Some select B450 are okay-ish for high core count CPUs. Most of them are the same bad VRM with a block of aluminium to soak heat spikes.
In other words: Topping E30 to feed Aries Cerat Cocero 25’s is reasonable, mkay?
there are a lot of good b450 and b350 boards actually but I only run a 3600x so I dont really weant a motherboard that costs more than how much I sepnt on my cpu so I was waiting for all the b550 boards to drop personally
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motherbhoards for me really only start to matter if when Im running multiple gpus or doing any hardcore OC’ng in this case its for a gaming pc for a resulotion where my gpu mattersmore than my CPU so a nice b550 board is all I need
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You’re abolutely correct. ANyonE who DaR3s to th1nK th4t U5inG a B450 w1Th a h1g3R t13R CpU 1$ R3t@rD3d.
10, maybe.
R3, R5 and non-X R7 are fine on B-series boards.
I don’t understand what B550 is meant to do:
What features is B450 missing you need in a budget build that B550 brings?
literallynothing aside from gen 4. I am just waiting to see if any board designs interest me aesthetically more than actual performance. to see if board designs improve this generation for more budget boards. Im in a uniquepostion where Im just buying a new board to give my old cpu and board away to my lil bro so he can upgrade his pc and because Im so close to the new boards dropping I may as well wait
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Was going to get 64GB of RAM at some point but things change. When I switched jobs in late 2018 I decided to buy two Dell PowerEdge R710 systems to replace the Optiplex systems I was “borrowing” from my previous employer. Well, since then I have moved to a total of four (4) Dell R710 systems with 128GB RAM each. I added a Synology DS1819+ with 8x512GB 860 Pro SSDs. I also switched my old Trendnet mini-switches to Ubiquiti 24 port switch and added a Ubiquiti 16XG (16x 10Gbe) ports for SAN storage between the R710s and the Synology. This is mainly why I have no audiophile money. That and I like to eat.
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what are your servers used for? how fast is your internet?
Mainly homelab training and testing environment to break things. When I moved to my current job I need to have a better understand of Active Directory and other things. I went from an IT shop of 250 people in my town down to 20 people world wide. So I needed a place to break AD and fix AD and understand DFS and other things. I was hired as a Database Admin, but “other duties as assigned” is always possible. lol! They also run stuff around the house, Plex and other things like download machine, file server, DNS/DHCP, etc.
Right now they are in a VMWare ESXi 3node cluster with the 4th machine not in the cluster.
As for internet, 1Gbps down and 40Mbps up - Comcrap Gigabit.
at least you have Gb! max I have right now is 250 / 25. we’re trapped into a local telecom, so it’s on their timeline and they’re well behind schedule as all of my town was supposed to have fibre rolled out by end of 2019 and I don’t think they even have half of it done yet. when that is complete, it’s 1Gb down and 100Mb up.
That’s great. Now I have even more of an excuse to keep using clickys mech boards
Bell didn’t get to you guys yet?
no, entire area is dominated by a telecom called CityWest. apparently there is legal wrangling gong on as Telus, Bell and Shaw all want in. I sorta see it as come-uptance…all the lil telecom’s want to parasite off their infrastructure, so now it’s their turn to parasite where they have no deciding interests but for a few cell towers.
I had to get Gigabit. I needed the fastest non-business upload speed possible. Business class with Comcast are 2x what I pay now. I did not want Gigabit. However the fastest upload was 20Mbps which is just not enough. Between Plex, my part and full time jobs along with various other things I would max out 20Mbps. Plus my roommate (Read: oldest child who pays rent) streams to Twitch from time to time. So uh, ya. That would not work and I would need a second or third ISP. Lol! I would be happy with 200Mbps up and down. Done. However, that is not an option. facepalm