MCX6400-V

• Hybrid copper base, thin aluminum pin heatsink: the 3/8" thick copper base provides excellent heat capacity and lateral heat dispersion. The thin aluminum pins promote increased turbulence for more efficient heat dissipation compared to traditional fin extrusions

• Patented Helicoid pin design (U.S. Patent 6,469,898): pins are individually machined in an helicoid shape, to increase their surface area, and further enhance heat dissipation efficiency

• Several patents pending for concentrically aligned rows of pins, bent at multiple angles. The spacing and angles between the concentric rows has been precisely calculated to optimize cooling and reduce noise at air flow levels as low as 22 CFM and 23 dB-A

• The MCX6400-V is compatible with 80 and 92mm fans. However, comparative test data shows that 80mm fans perform in general better with this heatsink, and at lower noise levels. Nonetheless, 92mm fan brackets are also available as an option. The MCX6400-V ships without a fan in order to allow users to customize the product to their application. 

• Quick and easy fan installation: the fan installs "in a snap" with convenient snap-rivets, provided with the heatsink.

• Exceptional quality and attention to details: the heatsink base is lapped to 0.0003" (3/10 of 1/1000"), and polished to near-mirror finish to promote optimum thermal conductivity. Users are advised that while flatness is strictly respected for providing the most significant benefit to thermal interface, surface polish is a cosmetic component and may vary slightly from one heatsink to another. Re-lapping or polishing the heatsink base is never recommended.

• The MCX6400-V is designed to be used without AMD® 's retention frame, but necessitates the backing plate for its installation.
  

• The spring loaded mechanism provides a safe and effective attachment method to the motherboard, and complies with AMD® 's static and dynamic load specifications.

• Because a majority of motherboard manufacturers already include the retention frame and backing plate with their offerings, and in an effort to spare this cost to the majority of users, Swiftech® does not include these items with the MCX64-V heatsink. These items are nonetheless offered as an option under part # AJ00172, as shown below.
  Users are advised to inspect the backing plate shipped with their motherboard, and to note that a metallic backing-plate featuring threaded standoffs is required. An example is shown below, and is available under part # AJ00264.
  

Silent to low noise category - Lower C/W is better
Brand	Size (mm)	Part #	CFM	dB-A	Heatsink-fan °C/Watts ratio (*)
MCX64-V original factory fan		AFB0812M	31.4	28	.272
NMB	80x25	3110NL-04W-B20	26.5	22.5	.321
Medium noise category - Lower C/W is better
Brand	Size (mm)	Part #	CFM	dB-A	Heatsink-fan °C/Watts ratio (*)
Delta	80x25	AFB0812HH	37.4	34	.249
High noise category - Lower C/W is better
Brand	Size (mm)	Part #	CFM	dB-A	Heatsink-fan °C/Watts ratio (*)
Vantec	80x38	TD8038H	84.1	55.2	.173
Delta	80x38	FFB0812SHE	68.5	48.5	.182

* C/Ws shown are the heat sink to air values, excluding thermal resistance of the TIM joint, which will vary depending on the thermal interface used and bench test conditions. For reference, Swiftech's TIM joint bench test value is 0.09 °C/W. All tests are performed in an environmental chamber using Industry standard procedures, and calibrated equipment.

Comparative Data to the MCX6400-V

The graph below compares the thermal resistance of the MCX64-V and the MCX6400-V.

The C/Ws shown are the heat sink to air values, excluding the thermal resistance of the TIM joint; which will vary depending on the thermal interface used and bench test conditions. For reference, Swiftech's TIM joint bench test value is 0.09 °C/W. All tests are performed in an environmental chamber using standard procedures and calibrated equipment.

The rated airflow is based on the fan manufacturers data and is not correct in terms of the actual airflow through the heatsink. But as the same fans were used for both tests their relative performance can be easily compared with accuracy.


Specifications

 Heatsink

• CNC machined, C110 copper base, flatness better than 0.0003", micro surface finish 8 or better.
• 405 Helicoid Pins made of High Thermal Conductivity Aluminum Alloy, press fitted in the base.
• Weight: 26.4 oz (750 g) (**)
  

(**) Weight exceeds AMD® specifications of 450g. Users are advised to take appropriate precautions when shipping a computer equipped with the MCX6400-V HSF.