Noise
While I am not going to go into detailed testing here specific to the 35X2, I will discuss my subjective thoughts and include the previous work on the 35X pump that can be used to consider noise. They are after all the same exact pump motor and very similar in pump top style, the only difference is we have two pumps that can produce basically twice the pressure as the same RPM. First let’s take a look at the 35X results from my pump noise testing round 1.
If the 35x (Single Pump) is decoupled from direct metal contact, it holds a noise level very nice and low a majority of the operating RPM range up to about 2.3GPM in that previous test. It isn’t until you push those peak RPM levels when noise starts to pick up and a more noticeable whine develops. This is where running two pumps does have a slight noise advantage over a single pump. It essentially produces the same amount of pressure at half the RPM level so you can operate at lower RPMs and still have gobs of power. Subjectively I would rather operate the 35X2 at 40-50%%PWM over a single 35X at 100%. The lower RPM is superior in both noise and heat.
Then there is the “HOW YOU USE IT” question. If you take advantage of PWM and throttle the pump speed according to temperature needs, you can get the best of both worlds of low noise and monster pumping power performance when you need it. In my long-term 35X use I found this to work extremely well. When surfing the net and doing office related tasks, I had speedfan dialing the pump down to 30% or so levels which is how it operates most of the time in complete silence. Then when gaming, I typically use headphones or when bench-marking I don’t mind a little extra noise, that is the only time the pump cranked up the power automatically to gain maximum performance at the expense of some noise. When wearing headphones I can’t hear the increased pump speed regardless, so it was an excellent and smart way to run the pump.
Pump Heat
Pump heat of the DDC series pumps can be high producing a base that is hot to the touch and should be considered as part of the install depending on how the pump is used. If you utilize PWM to throttle the pump down in speed a majority of the time, the heat levels will likely be kept down to levels you can ignore. Pump heat is also significantly dependent on the restriction level of the system where the more restrictive (lower flow rate) the less heat. You can read about some of the DDC pump heat testing I’ve done here.
In addition an active or passive heatsink can also be an effective way to help not only keep the pump cooler, but also reduce the amount of heat added to the water/coolant. At the moment, the MCP35x-HS would not fit without modifying it, but a 35X2-HS (heatsink specific to this pump) is in the works and should be available toward the end of February or early March.
At a minimum I would suggest using only two of the neoprene pads on the outer edges such that you have about a 1/4″ of air space under the pump centers and place the pump in a location where air can blow under the two pumps.
Alternatively, another effective way to both decouple and cool the pumps is to allow the pump to be suspended by tubing. The best mount in terms of noise and heat is no mount at all..:)
You just made my mind up on what pump/s system to get for my own personal rig. As well as the pumps i will be recommending in my shop. I love this pump setup. Swiftech have done a really good job with this product and for that matter the single unit system too.
e, jednakowoż teraz
przyjechało mocne pociągnięcie. Elke Zamknięcie sznurka
wyskoczył w dłoni, zniknął w zaroślach. Huk tratowanych
flor roslinnych,
skończony potężnym beknięciem. Wcześniej po wszystkim.
Hey Martin. I’m putting together my first water cooled computer and since the basement ambience is 5-15 degrees celsius cooler (depending on time of year), I’m planning to put a remote radiator there. The extra length of tubing will be about 8-10 feet round trip.This dual pump will come in handy with its extra head. The temp advantage, and noise isolation makes it appropriate to have the pump by the radiator and keep all noise out of my home office. I haven’t got everything figured out yet, for example – I’d like to keep the reservoir at the highest point to enable air bubbles to exit there, rather than by the pump/radator. I still don’t know how to handle cabling, and placing the pump remotely will complicate the PWM controlling off the motherboard+the 12V power supply. I’m not totally clear as to what it will mean in terms of maintenance either (i.e. opening loops, running up and down the stairs etc). Any suggestions, or warnings are welcome.
I have seen it done before. My only suggestion is to use larger ID tubing as the length does start adding some restriction. A nice large reservoir would make filling easier too. I would probably place it right before the pump. It’s a good setup that way. Been done before.
Question: Would you recommend two swiftechs 35x with a single top connected with a tube to avoid vibrations or would you recommend a dual top like for example the EK-DDC Dual TOP V.2 G1/4 – Black Acetal?
I think either option works fine. Dual top is just more compact and cleaner looking.
I have another question: is there any advantage of using a different pump top for Swiftech Extreme Flow Dual 12v DC Pump like the EK Water Blocks EK-DDC Dual TOP V.2 G1/4 instead of the original dual pump top of swiftech or is it just for aesthetics?
Mostly aesthetics, it’s a pretty optimized top already. I found the 35x top and xspc tops to be pretty close depending on the barb used so I assume the same is true for the dual top.