And some of them do, you're assuming from what was said "All of them do".
And you're still ignoring the mess of expecting users to understand that they need to #### about with first having access to older CPU's to then flash the BIOS. You haven't addressed this point at all.
OEMs will decide what motherboards will get supported as they are the ones who have to support the motherboards,not AMD.
They are doing exactly what Intel did with CFL as Asus went on record,saying Intel actually stopped them from implementing support on earlier motherboards. Then we found out certain laptop OEMs implemented support,so people on this forum have CFL CPUs in Z170 motherboards working fine.
They even mislead a system integrator.
Again to be perfectly clear on this point, board partners cannot support Ryzen 4000 series processors on 400-series motherboards without AMD’s help, it’s simply not possible. So don’t expect an AIB to crack the code and open up support, again without AMD’s support it’s not going to happen.It does seem as though this was a recent decision by AMD and their partners found out the same time we did, so that’s truly bizarre, but then given the last few product releases from AMD it’s getting harder and harder to be suprised by this stuff.
They didn't consult motherboard OEMs,they didn't consult system integrators - they pulled another stunt. So in the end some of you have not addressed the point,AMD mislead it's own system integrators and motherboard partners,now opening them up to liabilities. Its bad enough doing it to end customers,they are now doing it commercial partners too.
In the end I am not going to agree with you on some of you about this. I have seen so many here have a go at Intel doing the same stuff,but AMD does not get a free pass then. Either criticise both,or don't criticise any of them for doing things like this. You can't have it both ways!
I must remember most of those socket changes (and a few others) quite differently to you then.
Maybe they were more fondly remembered by some,but I think Martini is hinting back to some of them when he said what he said.
AMD introduced socket 754 and socket 939 concurrently,and then dropped 754 like a lead balloon leaving people high and dry. They had some nice CPUs no doubt,but their were arguments about what socket to use,like the whole B450 vs X570 discussion now.
Socket 754 was a mainstream socket,so many enthusiasts probably were on socket 939. So like here the whole should you get the cheaper socket/motherboard argument lost!
But either way the two socket thing for the Athlon 64 was a bit silly IMHO.
Then you had the quad FX platform - that was hilarious and short lived too. Introduced in 2006,and cancelled in 2007.That was a dead end
Then with AM2,closer to the Phenom II launch there was hints the Phenom II CPUs would work on them,and then AMD launched AM2+ but some motherboards got hacked support for the Phenom II CPUs.
Then there were hints the newer AM3 motherboards would have better socket compatibility with future AMD CPUs. Then AMD launched AM3+ around 5~6 months previous to the Bulldozer launch. Look at people being dissapointed by AM3 motherboards not working OK with Bulldozer:
https://forums.overclockers.co.uk/threads/support-bulldozer-gigabite-880gb-ud2h.18288197
Not the first or last thread on the whole AM3/AM3+ thing. The same why my "insert name AM3" motherboard won't work. Again more hacked support eventually.
They probably dodged a bullet there TBF!
This is the same period a senior AMD guy said Bulldozer would have higher IPC than a Phenom II on xtremesystems forums. That was another own goal there.
The FM sockets you would only care about,if you ever used them - probably not most here.
Socket FM1 - one generation socket and I have a Llano system myself.
Socket FM2 changed,and then people thought it might be longer lived,but then AMD announced if you want to move to Steamroller based APUs,you need socket FM2+ and the worse thing is the only difference between the motherboards was a few pins on the socket. One generation again. I had both side by side to have a good look at.
The FM2 was probably the worst of all of them,especially as the later CPUs required less power than the Piledriver based APUs. This is probably why some of the FM2+ versions(mini-ITX) had no VRM heatsinks,and the FM2 versions did.