You must be very careful, D5 survived serious changes. It's not clear what they change exactly but they influence on performance of original Laing D5 made in Germany before 10-12 years... Not only PWM control and small parts inside.
Some brands as EKWB D5 G2 and XSPC model with SATA Power connector add some small parts on impeller probably to increase performance. But that part cause vibration and more noise. No other solution than drilling D5 channel because impeller in that case need more space during spinning.
Guy nicely explain here...
Because of that I would stay with oldest batch I could find with speed controller.
Not only that, my motherboard example every time during restart computer cause D5 to run on full speed 2-3 seconds.
It's set in BIOS but never mind, motherboard work on that way and it's not only one. Pumps with Speed Control can't force to spin faster if you regulate speed. And I only could imagine suffering of PWM owners with motherboards where controlling fan is harder. On mine is easy, many options, settings. But it's not on every motherboard like that.
My pump is set 50% to 55C, than increase speed and on 75C is full speed.
I didn't set earlier because that's more warning setting, anyway difference between speed 3 (3300RPM) and Speed 5 (4800 RPM) is not big temp difference. That only should warn me that something is wrong if pump start full speed.
On other side D5 w Speed Control is better to have coolant sensor.
Swiftech MCP655 become most famous because they first use D5 and in that period before 15 years that was made in Germany.
After 2009-2010 production is removed and MCP655 on stock probably had 1-2 years more MCP655 w Speed Controller.
Look cool, no doubt, but how durable is should be waited little more maybe.
They will become famous and wanted if customers are satisfied.
Haa... I don't know why people continue to keep brown rubbers on Noctua NF-A12x25 PWM on side where not need when fan look much better with rubbers only on side turned to radiator? Without them look much better.
post edited by Vlada011 - 2019/05/11 00:19:05