MCP35X Pump, Black

I've been using this model pump for 4½ years now, and I leave my PC on 24/7. In my previous PC I used 2 of these for the CPU and 2 GPUs (all overclocked), and an external 400mm radiator. Only issue was after 3 years one would occasionally have trouble starting back up (couple taps would usually be enough to get it going again). When it was time to upgrade I got a bigger case to have everything internal, I figured it'd be better to just get a new pump. Current (single) pump has been in use for over a year, and no issues. I've read on the internet that it can run a bit warm, but as I only run it at 15%~40% (water can absorb an immense amount of heat, and I've got 2 280mm radiators) I've not had any issues.

Really had high hopes for this pump as I have used Swiftech D5's before and had great results. On first setup this was a great pump fit well in the space I had available and had pwm so the mb was able to set the speed according to load. But less than six months into operation the pump seized and died, thankfully thermal shutdown saved the rig but my confidence in this product has been shaken and even if I get the pump replaced I will not be putting in back in any 24/7 operation pc's.

Good pump, although it can be loud at high RPMs. I've used this with the optional reservoir that can be attached. I have attached this directly to a case through a couple of small holes on the bottom of the pump, this will transfer vibration to the case, but it stays in place with only one screw. I've also suspended it via the reservoir with a very short tube segment directly out of the CPU water block (motherboard is horizontal, not vertical). Done this way, the pump can hardly be heard, even at full RPM (4500). Attached directly to the case, the pump is nearly silent at 1500 RPM. Make sure you have some kind of software or BIOS ability to control PWM or buy a fan controller with PWM. Running this at 4500 RPM is unnecessary and will likely cause cavitation, which will build up air in the optional reservoir. The minimum RPM is supposed to be 1500, but I'm seeing 1380 and it is moving the water fast.

Lasted about 5 weeks then died on me.

If you're looking to cool a CPU and two GPUs this is a great pump for you. It's smaller than a D5 so it's much easier to put in smaller spaces, just be aware that this little guy can get pretty hot. Adding a heatsink and placing it near a fan helps the issue. The pump on MAX LOAD without the heatsink will run close to 60°C, with heatsink around 45°C and with heatsink and fan your looking at around 35°C. You can easily run it at 30-60% and heat won't be any issue. If you go into planning your loop with cooling down your pump in mind this is one durable workhorse.

Update 2/8/'18: My previous MCP35X pump lasted 4 years (typical setup - CPU/GPU/rad). This isn't bad even though it was behaving erratically for about a year before it finally burned out. And the PWM function gave up even earlier than that (2 yrs?). As water pump goes, for as long it's doing its job, I am contented.Unfortunately, this second MCP35X pump really have me questioning the quality of this pump. For one thing, from the beginning the fan error warning from the motherboard during boot up has been there since day one. I found out that was a well-known issue. And now, less than a year, the pump simply died (mar 18, 2016 - Feb 8, 2018). In my PC setup there's even a fan dedicated for cooling the pump. Obviously that was a waste of time. This pump deserve 1 star.Original: My previous pump (the same model) started to fail after 4 yrs of daily usage. Without hesitation I purchased the same pump because I know how small, quiet, reliable, and powerful this pump is. After two weeks, I finally had time to install the new pump. umm.... and the PWM does not work! The pump keeps running at full speed. :(Too much hassle and time wasting for a replacement. Very disappointed nevertheless.EDIT: My fault... PWM works! Needs to configure it at lower power (below 50%) to start seeing the effectiveness of PWM. At 70%, it runs at almost full speed. 5 stars.

I have two of these bad boys. This is a really strong pump and can be tamed to dead silent operation with the pwm control. The only thing I dislike with this pump is removing the housing will void the Swiftech warranty. This pump needs to stay cool for longer life so install this with a heatsink or a spot with good airflow.

Swiftech MCP35x is a great product. The only Con to this pump is that it gets hot. If you plan to purchase this pump, you must get the heatsink and fan along with it. I bought one that has is still going strong after 2 years and then bought a 2nd one after my D5 went out. I got them hooked up into series because I have a really restrictive loop using 3/8 tubing. Please see photos.