@Danny75
My CPU's base is 4.0. Freddie (from this conversation) has his at 4.7 according to his signature.
Yes. Your single core boost is 4.2. All core is 4.0. Not sure if that mobo is or can boost all cores to 4.2 instead of just 1 or 2 though. You could check in BIOS for any "multicore enhancement" feature or similar. But because it's not a Z board it's pot luck as to whether it has such a thing.
Nice card.
Because we're working blind in terms of which PSU, it could rule out two scenarios:
1. If PSU is multi-rail and GPU is on just one rail, then depending on quality of PSU it may not provide as much power as the Strix could take, and limit performance a bit.
2. Even if PSU is single-rail, or multi-rail and of good quality, using two different cables can sometimes improve performance slightly anyway.
At this point, I'm just looking for any advice on how to improve my machine so that it can be the best that it can be. If I do get a new motherboard, what would you suggest?
Strongly recommend sticking with CPU and mobo for now. See what AMD comes up with (Ryzen 3XXX) around June maybe. Then if worth it, sell mobo and CPU to help finance a new Ryzen 8-core and overclocking board. You may have to sell the 2133MHz RAM and get faster RAM, as well, as Ryzen so far benefits more from it than Intel does.
However, if going with the "my money, wanna overclock now" choice, then the cheapest Z170 or Z270 board out there as not worth spending more on old platform. I've just seen a Strix Z270H for £70.