I think I can resolve your fears.
My setup is similar excepting I use air cooling.
I also use a HAF XB EVO A really good case that is easy to work with.
I use a i9-11900KF.
My cooler is a noctua NH-D15s.
I mounted two 140mm fans in front of the mounting plate.
I did use a GTX1080ti FE before replacing it with a
Asus RTX 3070 TUF gaming which is 11.81" (300mm) long. A longer card can fit.
I think your 334mm is accurate, it looks like I have about 32mm extra.
Running a cpu-Z stress test, My top cpu temperature is about 70c.
I do not overclock, instead, I use the turbo mechanism to boost a couple of cores when the need arises and conditions permit. I seem to get 4.98 on all cores without any tweaking. These things are so fast that fiddling does not seem worth it.
Hi. Thank you for you reply and recommendations. When you stated you had my case and a more powerful CPU that was the same setup as another user answering my post. A third gamer had a different case but the same CPU and was also using the Noctua Cooler, so you sold me.
However...
While I was waiting for the delivery of the Noctua (it hasn't arrived yet...) I got on YouTube and watched a video of a gamer installing the Noctua on an LGA 1151 just like mine. At the end of the install he picked up the motherboard and it clearly looked like the head of the cooler was covering up the PCI-E 16 slot so alarm bells went off. I went to the Noctua site, located their motherboard compatibility list. Guess what.. INCOMPATIBLE.. The head of the Noctua will cover up the PCI E 16 slot on my Gigabyte Designairre MB.
I've put my corsair cooler back in my system and have it running again. I will be sending my second cooler purchase back to Newegg. I've also found a few graphic cards at 300 mm that will just squeak by my current setup (308 mm maximum length I can allow). I didn't even consider that my motherboard would be incompatible with the Noctua.
Live and learn. Being retired I have plenty of time to keep working on this gaming system.
Thank you for helping me, all of you's. Your input is appreciated.
Philip Baney aka 67 y/o kid.