Details
Thermal Grizzly's AM5 Mycro Pro RGB is a CPU water block for AMD's AM5 socket, and it is backward compatible with the AM4 socket. On Intel LGA1851? The Intel version is here.
Properties
- Sockets
- AMD AM5, AM4
- Cold plate
- Nickel-plated copper, 68 microfins at 0.2 mm
- Top
- Tempered acrylic glass, anodized aluminum cover
- Ports
- 2x G1/4", 6 mm deep
- Lighting
- Digital aRGB LEDs, 3-pin header
- Weight
- 201 g, 345 g boxed
How it is built
The cooler consists of four primary components. A nickel-plated copper cold plate sits on the CPU, and above it are a jet plate for flow optimization and a cooler plate made of tempered acrylic glass. A cover made of anodized aluminum closes the block. The result is a metal housing with a viewing window onto the internal layout, RGB-illuminated when you want it. Thermal Grizzly manufactures the block in Germany, and every unit goes through a compressed-air pressure test at 600 mbar after assembly.
Ultra High Performance Cold Plate
Thermal Grizzly mills its Ultra High Performance cold plates for CPU and GPU coolers with minimal and highly optimized slot and fin widths. In the case of this block, both the slot and the fin width on the nickel-plated copper cooling plate measure 0.2 mm, and a total of 68 microfins are located on the cold plate. Such a high number of thin, ultra-high-performance fins provides a very large surface area, allowing the coolant to dissipate heat quickly and efficiently. The cooler design milled into the acrylic glass, including the jet plate, is optimized for flow as well. In combination with the cooling fins it delivers what Thermal Grizzly calls outstanding cooling performance.
In Thermal Grizzly's in-house test, the block held a Ryzen 9 9900X at an average of 77.1 °C under full load. The chip was fixed at 5.3 GHz and 1.3 Vcore, about 230 watts, with a flow rate of 2.56 l/min on a Watercool MO-RA3 radiator. That is nearly twice the 120 watts AMD gives for an unmodified 9900X.
Integrated filter for consistently high cooling performance
A fine-mesh filter in the form of a sieve is located directly at the inlet port. It captures particles present in the water-cooling loop, which may include production residues, for example from radiators. These particles are filtered out there to prevent the microfins in the copper cooler from becoming clogged. Contamination of the microfins can impair the flow of the coolant and thereby reduce cooling performance, which may result in higher CPU temperatures. The filter helps delay this effect, and it can be cleaned if necessary.
Ports and RGB Lighting
The block is integrated into a custom water-cooling loop via two ports, one inlet and one outlet, each featuring standard G1/4-inch threads in the acrylic glass. Those G1/4" threads ensure compatibility with a wide range of water-cooling products, such as the Thermal Grizzly DeltaMate fittings. With two ports the block takes two compression fittings, for example the DeltaMate 16/10. After milling, the acrylic glass undergoes an annealing process that relieves internal stresses, in turn reducing the risk of stress cracks over long periods of use. The sealing rings used (O-rings) are EPDM (ethylene propylene diene rubber), a highly elastic material that is resistant to ozone and UV radiation.
Beneath the cover is the RGB LED lighting, which accentuates the clean design when illumination is desired. The RGB LEDs plug into a 3-pin ARGB header (+5V/DATA/GND) and can be controlled through the motherboard.
Fit and Product-Specific Notes
The block is not compatible with the AM5 High Performance Heatspreader out of the box. To use the two products together, the AM5 Adapter & Offset Mounting Kit is required. It is also not compatible with Direct-Die, so it belongs on a CPU that still has its heatspreader. On both the inlet and outlet ports the G1/4-inch threads are each 6 mm deep, which matters when choosing fittings. Thermal Grizzly keeps a compatibility list available online.
General Notes on Water-Cooling Products
- Do NOT use the block in combination with water-cooling components made of aluminum where the coolant comes into contact with aluminum, such as radiators with aluminum tubing.
- We recommend suitable coolants that contain biocides and corrosion inhibitors. They should be free of particles that could restrict water flow or clog the loop.
- Before filling, the custom water-cooling system should be tested for leaks with an air pressure tester (maximum 0.5 bar) for at least 1 hour. We stock a leak tester here.
- After filling, the system should be inspected regularly for any potential coolant leaks during the first 24 hours.
- According to Thermal Grizzly's specification, the operating pressure in the loop must not exceed 0.6 bar. Check that the maximum operating pressure ratings of components from other manufacturers are compatible with that.
In the box
- AM5 Mycro Pro RGB block
- 4x thumb nuts
- 4x #6-32 standoff screws
- 4x steel springs
- 4x polyamide M4 washers
- Allen keys, 2 mm and 2.5 mm
- Pressure test certificate for 600 mbar
Thermal Grizzly's data sheet is a PDF.
