Crystal ball territory. Support 'til at least 2025 with socket am5, depends if Amd releases a cpu with lower power consumption.
'Cheaper boards' have a tendency to not last very long or suffer from performance restrictions because they skimped on the vrms, more on the amd side than the intel side.
If you bought a cheap mobo which has only 2 dimm slots and 1 pci-e gpu slot on lga1700. It has been done: '
Garbage board'. It exists they're gonna sell it and someone's gonna buy it and learn, 'what?'.
Cheap or bargain is a false economy since you'd have to buy another board to fix what was allegedly wrong with the cheap one. If you put a powerful cpu in it. Lo end board + mid range cpu =fail. It isn't viable.
Far as upgrade path goes amd is simply releasing it's last batch later than intel. Whether they're going to make any major tweaks in that time to zen 4/am5? Suppose it takes about 3 months to fabricate a chip and then probably another 3 months to stock up and maybe another 6 months to market.
Maybe it takes them a year to ready a new cpu from the design phase they could maybe release 1 new series of am5 chip in two years which probably won't represent any major breakthroughs, it's not a real world difference.
Since they will be feeding back from experiences of zen 4 if they want to make any changes in that time.
I've seen one or two customers drop a 5800x cpu into their b450 board and it was like an aerial bombardment. The customer didn't really understand they had purchased a poorly reviewed 'cheap' board and the stronger cpu destroyed it. You have to read the review before you buy anything.
So, the question is also whether the 'upgrade path' is even viable since the cheap boards mess about too much with the power delivery system.
Besides, $600 for a mid level system for 5 years of use isn't quite accurate. Cpu mobo, ram and cooler is $600. You're still going to need a power supply and n.v.m.e drive and monitor. It's closer to a grand to break in to the modern market for anything that has a chance of lasting more. And that's without any additional peripherals such as printer, mice, keyboards, sound cards.
Then you're going to want some kind of backup device or more storage, a bunch of usb drives, speakers, headphones, mics, cameras.
And the 3000 series gpu later on is... another grand. So it's more like 2grand. That's 4x the op's budget.
The intel lineup of new ARC gpu suffers from restrictions on dx11 - low frame rates on older games. An upgrade but a downgrade. They're working on backwards compatibility with direct x 11 - manyana. It isn't progress it's deprecation. Not much is likely have XeSS patches. They did
shadow of the tomb raider - my favorite is actually original crystal dynamics tomb raider (2013) which they ignored.
Reflected in the price? So it competes on direct x 12... are folks buying cheap gpus going to buy a large library of new direct x 12 games? Smells like bs.
One presumes that ddr5 is perhaps a shot at getting 165hz on mid range desktop systems but if ppl already have a 144hz monitor or even a sub 1440p monitor that could last anywhere between 1-5 years or perhaps more... you can't know. I've had monitors last only a couple of years and one that has lasted so long (over 5 years) it's sub-hd and obsolete but still going which I find amusing enough to keep.
Once upon a time I had some large 17" crts and they all ended up dumped before they broke. Others had 21 or 24inch crts but that was before hd was even a thing.
If you want ddr 5 on intel lga 1700 then you need the z690 or z790 boards and overclock. Overclocking pushes your hardware - will it last as long as you want? Anyone's guess. Nobody has enough experience with the platform to say definitively.
Motherboards that are coming out very soon along with raptor lake makes it a much cheaper option then going for zen 4 right now, and still gives you the ability to upgrade further down the line when compered with raptor lake.
doin' ma head. What do you want? 165hz or more at 4k? Well more quality is more expensive. Forget cheap anyway. Basically you're locked in to the platform you buy on the day. If you want upgrades, spend silly amounts of money for 'eye candy'.