I wouldn’t say it’s obsolete at this point lol. But in another year or two it will be obsolete.
Once the stock speed and timings of DDR5 is able to overcome the latency deficit between DDR4 and DDR5, DDR4 will become obsolete.
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DDR5 for a bunch of reasons. Bandwidth among them.
DDR5 has ECC on-die.
The motherboards should be the same price so I’m not sure where you’re getting that they’re more expensive. Two of the same model boards, one being DDR5 and the other being DDR4, are the same price like 99% of the time.
DDR5 is more expensive but for your workload the additional cost is 100% worth it. It’s not like DDR5 is twice the price lol. You can get 64gb of 5600mhz for like $180.
Also, you can get 48gb sticks of DDR5 rather than 32gb sticks. They obviously cost more but the point is you can upgrade down the road if you find out you need more RAM.
Lastly, why are you stuck on 5600mhz? Why not 6000mhz or 6400mhz? More speed equals more bandwidth.
With extremely tight timings you can get close to the latency of DDR4. Within like 10-12ns I think. But I think that’s on much faster kits.
I’ll have to look around and double check lol.