Antec Kuhler H2O 620 - 14 years later

Scoob

Active member
Hey all,

Over fourteen years ago, back in early 2011, I built a new system based around the 2500k. For cooling, I didn't got the usual air cooler route, rather I got one of the fairly new at the time AIO coolers - namely the Antec Kuhler H2O 620, which only has a small 120mm radiator. This was a fantastic little cooler, very quiet and seemed to push above its weight in terms of cooling. I replaced the supplied fan with an alpenföhn 120mm Fan, which was considered one of the best for static pressure and flow at the time, ideal for a small radiator. Of course, it couldn't quite keep that 2500k @ 4.6Ghz as cool as I'd like - the frequency it lived at its entire gaming life. Gaming was perfectly fine, but when stress testing it was a little too much for it. Fair. So, I eventually went full custom loop on that system.

The Antec wasn't redundant though, I actually gained a second system - a 2600k, Gigabyte Motherboard, 32GB RAM - and it went on to cool that. At the time, Games didn't really benefit from the hyper threading offered by the 2600k, and the 2500k could clock slightly higher for the same voltage, so it remained my main gamer for a while. The 2600k gained the moniker "Gamer Jnr" as it was the PC I took with me to LAN parties, my by now fully custom-looped 2500k build not really portable.

Eventually, as things evolved, more and more stuff was able to take advantage of the 2600k's Hyper Threading, so it was the 2600k that went into my main Gamer, sitting nice and cool under the custom loop. The 2500k system became a bit of a workhorse PC, used for other activities.

As time passed, PC's changed as they do, bringing me to today. That little Antec Kuhler H2O 620 currently sits on a 4790k I got some time ago - already second-hand at the time. It's currently sat there, whirring away in near silence - the fan is louder - cooling said 4790k. It gets a bit toasty at times, as you'd expect, but it does keep temperatures in check, though the 4790k is running at stock - blasphemy I know lol. However, this is just a system I'm tinkering with, though it has inherited the "Gamer Jnr" title, not that we LAN game any more... though many have voiced interest in restarting that tradition. Supreme Commander: Forged Alliance was our game of choice, this PC is easily capable of that.

I remember a casual conversation with Tom back in the day, he was far from impressed by the idea of 120mm AIO. However, I shared my good experience with the Antec, but I think he was still sceptical. We're influenced by our own experience of course, and mine was pretty darn positive.

At one point, fairly recently in fact, I was convinced that this AIO had perhaps finally died. I turned it on (4790k) for the first time in a while, and the pump was noisy. I assumed just an air-lock from where it'd been moved - it happens - but I could not get it to go away. I could see that the coolant wasn't being moved efficiently, the block was hot, but the rad remained cold. CPU temps hitting 99c too, which was previously unheard of. After some attempts to free the air-lock, resulting in failure, I did consider that perhaps the pump had finally gone, said air lock likely killing it. I gave up.

Today, for some unknown reason, I was inspired to tinker again. System powered on, pump still noisy, temps too high. I dismounted the thing entirely, allowing gravity to do its thing as I attempted to release the air lock. Last chance. Fresh TIM appied - after cleaning to Iso-propanal - carefully remounted to not get another air lock, assuming I'd cleared the one that was there of course. Powered on...silence... is it dead? Nope, it's purring away quietly, cooling well as I mentioned at the start.

So, at over fourteen years old, and having seen pretty consistent use in various builds over that time, this little AIO is still doing well. It's not on a high-end gaming system, well, not from this era, but it's on the toasty little CPU that is the 4790k, and it's doing well. Now it's working, I'll likely be giving it a little stress, just for the fun of tinkering really. Might get some older games back on there too.

FYI: this "retro" system is using one of the two GTX 680's I bought in 2012. Still going strong too. These 680's were both water cooled all their "main gamer" life, only having the original "Blower" style air coolers popped back when they were repurposed. While not strictly compatible, this system is running Windows 11, and rather nicely too. This PC was infact my test bed for getting Windows 11 on "incompatible" hardware.

Anyway, a bit of a ramble, but thought I'd share. Tom, if you're reading, this AIO is still great! :)

I just noticed that my signature is still that of the original 2500k Water Cooled system, with the two 680's - which replaced two 570's - I think I'll leave it as this, as I was really proud of this system. My main gamer today - 5800X3d - is still using that same external loop.
 
That's good going for an old AIO. Very good work from that old thing.

Indeed it is. I've been hearing stories for years about AIO - even high-end ones - not having the longest of functional lifetimes. Still, we'll see if this post tempts fate at all. Been using the PC for a few hours today, and all has been well. It's all disconnected and put away again for now.
 
I can relate to this! It's nice using old hardware.

I'm using the Corsair H100i I believe 2nd gen maybe 3rd gen. It's been so long I don't even remember lol. The first one that had the USB coming off the pump for (terrible) monitoring software.

I believe it's nearly 10 years old. Been in use for thousands of hours across multiple builds. Only ever changed the fans 3 times. Now running Notcua AF12s. Silent, runs, no issues ever!
 
I have this "thing" where I find it exceptionally hard to throw away working hardware. As such, my original Q6600 PC is still functional, and a great little box for just regular Office and Internet surfing type activities. Of course, I have far better hardware available to me, but it is indeed nice having the old stuff still working.

Talking water cooling, my external loop - built in 2011 - is still going strong, that's what's in my signature, but it's on my current gaming PC now. The play always was to move the loop to the next PC, just needing CPU and GPU blocks each time, and that's what I've done. It was expensive at the time, but to be using the same Radiator, Pump, Reservoir, quick-disconnects and pipes into the PC is great. All powered by the same 90w "brick" external PSU.
 
I have this "thing" where I find it exceptionally hard to throw away working hardware. As such, my original Q6600 PC is still functional, and a great little box for just regular Office and Internet surfing type activities. Of course, I have far better hardware available to me, but it is indeed nice having the old stuff still working.

Talking water cooling, my external loop - built in 2011 - is still going strong, that's what's in my signature, but it's on my current gaming PC now. The play always was to move the loop to the next PC, just needing CPU and GPU blocks each time, and that's what I've done. It was expensive at the time, but to be using the same Radiator, Pump, Reservoir, quick-disconnects and pipes into the PC is great. All powered by the same 90w "brick" external PSU.

If it still works, why not keep using it? Too much old kit gets thrown away needlessly.
 
If it still works, why not keep using it? Too much old kit gets thrown away needlessly.

Exactly. I try to find valid uses for older kit. So, a backup box - lots of mirrored storage - or a media server, connected to a TV (obsolete in many ways, due to today's smart TVs) or something for others to use. It's nice to be able to take an old, non-functional laptop and make it into something useful again, same with all the spare bits I've built up over the years, turning them into a fully-functional PC. I've only ever paid for two laptops - both gifts - all mine have been "junk" I've been given, which I've ultimately fixed.

One of my largest concerns about Windows 11's installation restrictions is that many people will likely just buy something new, leaving otherwise good kit to go into e-waste. That's criminal!

Older PC's have always been my test bed for a new OS. Windows 11 tried to prevent this, but there are ways of course. Once tuned, Windows 11 runs great on "unsupported" hardware. I learnt things getting it working on said older kit, so once it was on my modern, fully compliant kit, I've been able to tune it to get it working particularly well.
 
Exactly. I try to find valid uses for older kit. So, a backup box - lots of mirrored storage - or a media server, connected to a TV (obsolete in many ways, due to today's smart TVs) or something for others to use. It's nice to be able to take an old, non-functional laptop and make it into something useful again, same with all the spare bits I've built up over the years, turning them into a fully-functional PC. I've only ever paid for two laptops - both gifts - all mine have been "junk" I've been given, which I've ultimately fixed.

One of my largest concerns about Windows 11's installation restrictions is that many people will likely just buy something new, leaving otherwise good kit to go into e-waste. That's criminal!

Older PC's have always been my test bed for a new OS. Windows 11 tried to prevent this, but there are ways of course. Once tuned, Windows 11 runs great on "unsupported" hardware. I learnt things getting it working on said older kit, so once it was on my modern, fully compliant kit, I've been able to tune it to get it working particularly well.

I agree that Windows 11's requirements are silly. It's forcing upgrades on an industrial scale for no real reason. So much for Windows 10 being the last version of Windows... It's sickening to see so much good hardware go to waste. Not many people can repurpose hardware like we enthusiasts can.
 
I agree that Windows 11's requirements are silly. It's forcing upgrades on an industrial scale for no real reason. So much for Windows 10 being the last version of Windows... It's sickening to see so much good hardware go to waste. Not many people can repurpose hardware like we enthusiasts can.

It's nuts. All these restrictions on the retail versions are daft. If you're using the Enterprise version though, you can pretty much install it on whatever you want. I cannot recall 100%, but I think certain command line switches were needed though. However, it's all legit MS stuff, no "bypass" tool needed. The only "hard" restriction is that the CPU supports SSE 4.2 and some other things... my oldest CPU is a mobile Pentium of the Sandy Bridge generation I think, currently running Windows 11 Pro just fine. That's pretty old.

The whole local account blocking is another issue, I've always used local accounts, for reasons. I will continue to do so. There are ways to legitimately set up with a local account (Enterprise) and plenty of bypass option for those that (try to) insist on a Microsoft account.

Don't get me wrong, I have a Microsoft account - have for years, it was tied to my MSDN subscription back in the day - but I won't use one on my own PC's.

Still, I'm doing my part by helping people update to Windows 11 - with the caveat that they might run in to issues in the future. However, that's true of fully supported W11 installs as well, so I don't really see it as a down-side. I read that some users of W11 22H2/23H2 have issues updating to 25H2. I got the 25H2 update offered to both my fully-supported (no artificial restrictions) PCs, and they're working just fine. My older machines are on 24H2, having not been offered the update... so far. Perhaps they will, perhaps they won't, we shall see.

I love that what can often be an expensive purchase new, still works and offers value over a decade later. Also, how very useable even an ancient Q6600 (running W10) can be even to this day for light use. Early SATA SSDs transformed the usability of a lot of older kit.
 
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