When I bought the Aorus Liquid Cooler 360 for my current build in 2020, I didn't expect it to last this long. In fact, this was my first-ever liquid cooler, and given how often people bring up pump failures and coolant leaks, I went in with almost no expectations. I figured if something went wrong in two or three years, I'd just replace it with a new one for $100–150. Fast-forward to 2026, and it still hasn't shown any meaningful signs of wear.

Pump noise is fine, temperatures are still decent, and although an upgrade makes sense at this point, I don't feel like I need a new one right now. This experience made me recall how I had to replace the fan on my Cooler Master Hyper 212 EVO air cooler four years after I bought it for my old PC. Even though air coolers aren't immune to wear and tear, we still treat AIOs as if they're very fragile. Sure, I may have gotten lucky with my unit, but the assumption itself is worth questioning.

Its 360mm radiator deserves most of the credit

Modern CPUs run hotter, but a 360mm radiator is still more than enough

Arguably, the main reason my cooler has aged so well is due to its sheer radiator surface area. A 360mm radiator gives you a level of thermal headroom that most CPUs simply can't overwhelm in real-world use, even today. Yes, newer CPUs like the Ryzen 9 9950X3D and Core 9 285K do pull more power and boost more aggressively than the 5900X I initially paired my cooler with, but that extra power doesn't suddenly make a 360mm AIO less desirable. If I had a 240mm AIO, it would've been a completely different story.

Where a larger 280mm or 360mm radiator really shines is during sustained workloads. We all know that modern CPUs boost and then dial back their clock speeds when they're close to their thermal and power limits. A larger radiator acts as a buffer in these situations. It absorbs heat during short boost spikes and dissipates it gradually, rather than saturating quickly and forcing the fans to ramp up just to stay afloat. That behavior keeps temperatures more consistent over time, which matters a lot when you're gaming for several hours as I do.

A new 360mm AIO won't significantly improve temps

Without signs of wear, I feel like I'd be spending money just for the sake of it

I get why I should probably consider upgrading my AIO six years in. Pumps don't last forever, coolant permeation is real, and at some point, age alone becomes a valid reason to be cautious. But that logic only really holds if there are signs that something is actually changing. For instance, if my AIO is actually on its last legs, I should be constantly dealing with higher CPU temperatures or noisy pump or fan noise, but that's not the case.

Of course, it's not performing as well as it did when it was new, but I can still get away with my 5800X3D running close to 80 degrees after a slight undervolt and a fresh thermal paste. My point is that a new 360mm AIO isn't going to magically lower my CPU temps by 10 degrees. At best, I'd be paying full price for marginal gains that wouldn't really change how my CPU behaves while gaming. Until I start seeing clear signs of degradation, getting a new one feels more like an unnecessary expense.

A 420mm AIO could be a real upgrade

More radiator surface area definitely helps, but my current CPU doesn't need it

If I look at this purely from a technical standpoint, a 420mm AIO could actually move the needle. On paper, that's a 36% increase in radiator surface area, the same jump you get going from a 240mm to a 280mm radiator. During workloads where my CPU is under sustained all-core load, that extra surface area can translate into lower sustained temperatures or quieter fan operation. Unlike swapping one 360mm AIO for another, stepping up to 420mm would be a real upgrade.

However, considering I use a 5800X3D right now, I'd argue a 420mm AIO would be overkill, if anything. This CPU simply doesn’t draw enough power to justify that much cooling, even under sustained loads. Sure, if I upgrade to a 9950X3D down the line, I'd absolutely have no problem splurging on a high-end AIO like the Arctic Liquid Freezer III Pro 420. Until then, upgrading my cooler feels like future-proofing for a CPU I don't own yet.

I don't need to rush to upgrade just yet

Honestly, I'd say my AIO probably has at least a year or two left, and I'm perfectly comfortable riding it out until I actually start facing problems like high CPU temps, loud fans, or pump noise that's impossible to ignore. But right now, it's doing exactly what it's supposed to do despite being six years old. Its cooling performance may have degraded over the years, but for my 5800X3D, it still gets the job done. I'm sure I'll reassess when I do decide to upgrade to a newer CPU, because the benefits of a 420mm AIO, especially one with a thicker radiator, are much easier to justify at that point.