Model H81MHV3 version 3.0, updated to software 7.0
Model H81MHV3 version 3.0, updated to software 7.0
On the site, not every processor is shown as supported. It seems some models were left out because they weren<|pad|>, so you might want to check if a missing chip will still work with your motherboard.
Purchase the processor and try it out with the board. What CPU are you interested in? If it's superior to an i5 or comparable Xeon E3 1220/5 v3, opt for a used Ryzen setup instead (don't believe the fools in Lalaland who think an i7 is worth more than a used Ryzen 3100).
You already have the CPU, an i5-4690K, but you're missing the motherboard.
Consider purchasing a Z board for overclocking since stock clocks are unreliable and 4.6+ is easily achievable on Haswell or at least get an H87/B85 and flash it to a Z87. I haven't tested whether OC works yet; I managed to get a Z87m Plus with BIOS on an H81M-E but no CPU to test with. The same applies to an H61M-E (P8Z77M).
It's not worthwhile to purchase new equipment released ten years ago.
If you're purchasing brand new, consider selling your 4690k for a higher price. If you prefer to keep it, used options are available but come with their own considerations. Online used purchases usually offer buyer protection, while in-person transactions require self-checking. Stick with what you know unless you're comfortable testing components yourself. Most used boards have proven reliable over time, especially if they're genuine and well-maintained.