What’s the Best 420mm AIO Cooler for a 9950X3D?

If you're not worried about budget, the Arctic Liquid Freezer 3 is probably the best option out there right now. Just check if the Pro version is still available in the UK; it could be a great alternative!

Honestly, I'd recommend going for a 360mm cooler instead. For a 9950X3D, a 420mm cooler is overkill, and 360mm models give you great cooling plus they fit in more cases without issues. Most of the time, that’s all you need—especially if you’re not overclocking!

I saw that the white Liquid Freezer III 420 is in stock on Overclockers for about £90. However, keep in mind that while it's listed, it might be in limited supply since it's supposedly reaching End of Life status. You might also want to look at the Corsair iCUE H170i Elite or the beQuiet Silent Loop 3 as other decent 420mm options, but again, a 360mm would serve you just fine!

I think the Liquid Freezer 3 is a solid choice, but if you want something else, consider the Phanteks T30 360 Gen 2. It’s a bit pricier but offers excellent performance. Still, I wouldn’t spend over $175 unless you really want the extra edge!

A 420mm AIO might be more cooling than you actually need. Without overclocking, the CPU runs at around 229 watts max, so a 360mm should be more than enough. Plus, finding a case that supports a 420mm radiator can be quite tricky! If you're set on a 420, though, look out for the Thermalright Frozen Warframe; it gets good reviews and is reasonably priced if available.