Ice Giant Prosiphon Elite Review: Catch the Biggest Air

Back in 2019 we were one of the few media outlets to get an early look at the prototype IceGiant ProSiphon, an innovative CPU-cooling behemoth that uses natural convection of warmer and cooler states of coolant to effectively ‘pump’ the energy-rich evaporated vapor through the cooler. The months since have brought us to the final version of the IceGiant ProSiphon Elite, and while it still maintains its massive stature, it is noticeably thinner due to a redesigned condenser, which improves upon the original prototype.

The new and improved IceGiant doesn’t break any records, but it does provide a great alternative for system builders who want big and bold, yet still opt to avoid large AIO liquid cooling. Currently available for order from the IceGiant website, it will soon be available for purchase at MicroCenter retail stores as well as available at e-tailers Amazon and Newegg.

Ice Giant Prosiphon Elite Specifications

The IceGiant ProSiphon Elite includes mounting hardware to accommodate current processor models for both Intel and AMD, including high-end desktop (HEDT) variants like Intel’s i9 Comet Lake chips and the multi-core behemoths that are AMD's Threadripper processors. The IceGiant makes use of four 4-pin 120mm cooling fans to allow for push+pull airflow configuration out of the box.

Mounting brackets, backplates and supports are incredibly over-engineered to account for the 2-kilogram (4.42 pounds) mass they must support. In fact, just about everything about the IceGiant feels industrial-grade, down to the syringe of high-performance Thermal Grizzly Kryonaut thermal compound included.

IceGiant covers the ProSiphon Elite with an unprecedented 10-year warranty, which includes the cooling fans.

For those who might have missed our original definition of how the IceGiant ProSiphon Elite thermosiphon cooler differs from a traditional heatpipe cooler, please allow us to gratuitously plagiarize our own coverage of the original ProSiphon Elite Protopype: 

Heatpipe coolers rely on the boiling and evaporation of a liquid (typically distilled water) within each individual heatpipe, which travels up the hollow center of the pipe, begins cooling and then fully condenses further up the cooling tower, while dissipating thermal energy in the process. Once that liquid has fully converted back to liquid form, a sintered wicking material along the heatpipe walls then draws the liquid back down to the base to begin the process once again.

A thermosiphon works on similar principles, as it also requires the boiling, evaporation and condensation of a liquid--in this case, a dielectric fluid. A thermosiphon instead makes use of natural convection of warmer and cooler states of coolant to effectively ‘pump’ the energy-rich evaporated vapor through the cooler. Using large, flat condenser cores, the IceGiant ProSiphon Elite utilizes greater surface area to effectively transfer thermal energy out of the fluid vapor, into the cooling fins and away from the cooler.

The primary heat exchanger features three condenser cores, which dissipate heat provided from the evaporator in the cooler’s base. The original ProSiphon prototype featured only two condenser cores, allowing the newer retail version of the cooler to have a thinner overall profile when compared to the original. Retention hardware is engineered into the cooler’s base pedestal, which provides an anchored mount once the cooler is installed.

The ProSiphon Elite makes use of four 120mm, 4-pin PWM fans rated up to 2300 RPM for push+pull operation. The front pair push cool, ambient air into the heat exchanger and over the condenser cores, while the rear fans pull the warmed air out and away from the cooler. This provides the IceGiant plenty of fresh air in which to breathe (or rather, cool) freely.

The entirety of the IceGiant ProSiphon is made of high-grade aluminum, including the precision-milled pedestal base and mounting contact which is large enough to fully cover an AMD Threadripper CPU. Tension screws are permanently affixed to the primary tension bar on the cooler base, which ultimately adds to your advantage later during the installation process.

The base of the ProSiphon Elite is milled perfectly flat; we are unable to see any residual light peeking beneath the face of a steel rule.

The thermal paste contact patch from our i9-10850k is dwarfed by the untouched backdrop of clean, remaining aluminum of the mounting base.

By comparison, the thermal compound patch from our Threadripper 2990WX consumes the entire canvas of the cooler base.

Remember those tidbits about the rugged mounting hardware and the tension screws mounted into the cooler base?  Once the backplate and brackets are secured, the cooler base centers itself neatly into position atop the CPU, which aligns the tension screws with their sockets. Both Intel and AMD/Threadripper mounts benefit from this design.

To secure the IceGiant ProSiphon Elite, the front fans are removed and the tension screws torqued into place. Once secure, the front fans are added back and connected via PWM pigtail splitter to the other fans of the cooler to be managed by your favorite fan controller or motherboard header.

We’ve tested some large coolers before (including the prototype predecessor to the current IceGiant), yet it always manages to bring a bit of a smirk to our faces seeing such a large piece of cooling hardware in operation. The base height of the IceGiant does allow for relatively tall memory modules to be used. But as usual, check for clearances for specific hardware as needed.