In 2019, we were one of the few media outlets to take 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 move the energy-rich vaporized vapor through the cooler. In the months since, we’ve reached the final version of the IceGiant ProSiphon Elite, and while it still retains its massive stature, it’s noticeably thinner thanks to a redesigned condenser, which is an improvement over the original prototype.
The new and improved IceGiant doesn’t break any records, but it offers a great alternative for system builders who want big and bold, but choose to avoid large AIO liquid cooling. Currently available for order through the IceGiant website, it will soon be available for purchase at MicroCenter stores and also available at e-tailers Amazon and Newegg.
Ice Giant Prosiphon Elite Specifications
|Height||6.5″ / 165.1mm|
|Width||9.88″ / 251mm|
|Depth||2.0″ / 50.8mm (4.0″ / 102mm with fans)|
|Assy. offset||1..0″ / 25.4mm up|
|0.75″ / 19.1mm forward|
|fans||(4) 120 x 25mm|
|Connectors||(4) 4-pin PWM|
|Weight||70.8oz / 2007g|
|Intel sockets||1366, 115x, 1200, 2011, 2066|
|AMD sockets||AM4, TR4, sTR4x|
The IceGiant ProSiphon Elite includes mounting hardware for current processor models for both Intel and AMD, including high-end desktop (HEDT) variants such as Intel’s i9 Comet Lake chips and the multi-core behemoths that are AMD’s Threadripper processors. The IceGiant uses four 4-pin 120mm cooling fans to allow for a push+pull airflow configuration out of the box.
Mounting brackets, backplates and supports are incredibly sophisticated to account for the 2 kilograms (4.42 pounds) of mass they have to carry. In fact, almost everything about the IceGiant feels industrial, right down to the syringe with high-performance Thermal Grizzly Kryonaut thermal compound.
IceGiant backs the ProSiphon Elite with an unprecedented 10-year warranty, including the cooling fans.
For those who may have missed our original definition of how the IceGiant ProSiphon Elite thermosiphon cooler differs from a traditional heatpipe cooler, please allow us to plagiarize our own coverage of the original ProSiphon Elite prototype for free:
Heatpipe coolers rely on the boiling and evaporation of a liquid (usually distilled water) in each individual heatpipe, which passes through the hollow center of the pipe, begins to cool and then completely condenses further in the cooling tower, while in the process thermal energy is dissipated. Once that liquid has completely converted to liquid form, a sintered wicking material along the walls of the heatpipe draws the liquid back to the base to start the process again.
A thermosiphon works on similar principles in that it also requires the boiling, evaporation and condensation of a liquid – in this case a dielectric liquid. A thermosiphon instead uses natural convection of warmer and cooler states of coolant to effectively “pump” the energy-rich vaporized vapor through the cooler. Using large, flat condenser cores, the IceGiant ProSiphon Elite uses a larger surface area to effectively transfer thermal energy from the liquid vapor to the cooling fins and away from the cooler.
The primary heat exchanger has three condenser cores, which dissipate the heat from the evaporator in the bottom of the cooler. The original ProSiphon prototype had only two condenser cores, giving the newer retail version of the cooler a thinner overall profile compared to the original. Retention hardware is built into the base of the cooler, providing an anchored fixation once the cooler is installed.
The ProSiphon Elite uses four 120mm, 4-pin PWM fans up to 2300 RPM for push+pull operation. The front pair pushes cool ambient air into the heat exchanger and over the condenser cores, while the rear fans pull the heated air out and away from the cooler. This gives the IceGiant enough fresh air to breathe freely (or rather, cool).
The entirety of the IceGiant ProSiphon is constructed of high-strength aluminum, including the precision-machined pedestal base and mounting contact large enough to completely cover an AMD Threadripper CPU. Turnbuckles are permanently attached to the primary tension rod on the cooler base, ultimately increasing your benefit later in the installation process.
The base of the ProSiphon Elite is milled perfectly flat; we can’t see any residual light peeking under the face of a steel ruler.
The thermal paste contact patch of our i9-10850k is dwarfed by the pristine backdrop of clean, preserved aluminum of the mounting base.
In comparison, our Threadripper 2990WX’s thermal bond patch consumes the entire canvas of the cooler base.
Remember those tidbits about the rugged mounting hardware and turnbuckles mounted into the cooler base? Once the backplate and brackets are secured, the cooler base centers itself neatly in place on top of the CPU, which aligns the turnbuckles 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 turnbuckles are turned in place. Once secure, the front fans are added back in and connected via PWM pigtail splitter to the cooler’s other fans 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), but it always manages to put a bit of a grin on our faces when we see such a large piece of cooling hardware in action. The base height of the IceGiant allows the use of relatively high memory modules. But as usual, check for clearances for specific hardware if necessary.