Hi, thanks for the replies.
This PC has a bit of a split personality - on the one hand its main display is a 24" 15k CRT arcade monitor for that authentic arcade feel. It’s also connected to my 75" 4k TV for those 4 player Bomberman sessions…
To display to the CRT I use a Radeon R9 280x (The last Radeon to have a real, proper analogue VGA output) while the TV connects via an RTX 2060. Using the CRT, it really doesn’t matter what CPU is in there - the Radeon is the bottleneck.
I guess I’ve been happy with this PC for the past few years and had the motherboard not failed, I wouldn’t dream of replacing it. Think I’ll buy a second hand 1150 motherboard which will give me time to plan my next PC build…