MCX6400-V™ heatsink for AMD® Athlon™ 64 and Opteron™ processors Made in the USA  U.S. patent 6,469,898 Introduction: The MCX6400-V™ continues the extreme performance-low noise tradition of our "V" series heatsinks, and is designed to operate with AMD® Athlon™ 64 and Opteron™ (socket 754, 939 & 940) processors. This model is the heaviest, and features a larger number of pins for higher heat dissipation than any other Swiftech® heatsink at the date of this release. It is primarily intended for extreme applications and operating conditions. Features highlights Hybrid copper base, thin aluminum pin heatsink: the massive 1/2" thick copper base provides superior heat capacity for unparalleled stability in extreme overclocking applications. 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 dbA. 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.   Back to top Motherboard and CPU compatibility The MCX6400-V™ is compatible with all known Athlon™ 64 and Opteron™ motherboards at the time of this release. The heatsink base fits inside of AMD®'s specified "no components" zone, and it does not interfere with surface mount components. Example of installation with Gygabyte K8N Pro motherboard (80mm fan is not included with the heatsink) Back to top Retention Mechanism 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 load specifications. Because a majority of motherboard manufacturers already include the backing plate with their offerings, and in an effort to spare this cost to the majority of users, Swiftech does not include the backing plate with the MCX6400-V™ heatsink. This item is nonetheless offered as an option under part # AJ00264, and is 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. part # AJ00264 Back to top Performance data Suggested fans. We have extensively tested a large number of fans in our labs. Below is a list of a select few that were found to perform well with the MCX6400-V™ heatsink. This list is intended to be updated as we receive more fans from the manufacturers for testing. For user convenience, we separate all our bench tests into 3 distinct categories characterized by the fan's audible noise level: Silent to low noise operations 22 to 26 dbA: For non-overclocked processors. The MCX6400-V™surpasses all known temperature specifications published by AMD® to this date. Medium noise operations: 28 dbA to 40 dbA - From mild to serious overclocking levels depending on the fan selected, or high temperature environments. Up to 100 Watts processor load. High noise operations: 40 dbA and up - From serious to extreme overclocking depending on the fan selected, up to 130 Watts processor load. Silent to low noise category - Lower C/W is better Brand Size (mm) Part # CFM dbA Heatsink-fan °C/Watts ratio (*) Delta 80x25 AFB0812M 31.4 28 .247 NMB 80X25 3110NL-04W-B20 26.5 22.5 .291 Medium noise category - Lower C/W is better Brand Part # CFM dbA Heatsink-fan °C/Watts ratio (*) Delta 80x25 AFB0812HH 37.4 34 .220 High noise category - Lower C/W is better Brand Part # CFM dbA Heatsink-fan °C/Watts ratio (*) Vantec 80x38 TD8038H 84.1 55.2 .152 Delta 80x38 FFB0812SHE 68.5 48.5 .161 * 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 MCX64-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 manufacturer’s 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. Click on picture to enlarge Back to top Specifications 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. Back to top Suggested Retail Pricing Please consult your Swiftech distributor prior to ordering direct from us, or purchase the product factory direct here MODEL Factory bundled-FAN Mounting Hardware MSRP in US$ Motherboard backing plate Fan hardware for 80mm fans MCX6400-V™ No No Yes $59.00 Accessories & Replacement parts Part # Description MSRP AJ00264 Backing Plate $2.87 Fanbckt90 Set of 4 Fan brackets to install 92mm fan $3.25 Back to top