Congratulations, you paid for new motherboard and ram just to reach level of performance from 6 years ago. Used i7-4790 is ~$80, motherboard and DDR3 ram would cost 1/2 the new counterparts.
Yeah right. DDR3 memory is more expensive than DDR4, even used one, and runs at half the frequency. A six year old mobo doesn't support thunderbolt or usb 3.1 connectors. An i7-4790 runs hotter and doesn't support more than 32GB while a 10th gen i3 goes up to 128GB.
Is that a good bang for the pound even after the price drop? (cost/performance ratio)
The processor is very efficient. Four cores at 3,6GHz, and can support up to 128GB of RAM. Even AMD can't beat that.
Why would you want 128GB of RAM without ECC support, something totally mainstream at AMD?
I have ECC RAM on my servers. I don't care for it on my desktop rig.
Ryzen 3100 can do the same, at the same price point, and was released 5 months earlier than 10100F.
Good for Intel for finally catching up?
Good luck finding a 3100 at less than 100 euro though.
Sure, but if you don't have a GPU to go with that it won't even boot. The non-f version is twice that.