MCX775-V™ heatsink for Intel® processors (socket LGA775) Made in the USA  U.S. patent 6,469,898 New: as of 4-22-08 Revision 3 replaces the earlier version and consists in a new retention system composed of a motherboard backplate and rugged "hardmount" mechanism for simplified installation, and enhanced performance. Introduction: The MCX775-V™ heatsink is a high performance-low noise thermal solution for Intel® processors using the LGA775 socket. This includes the Pentium® 4, Celeron®, Core 2 Duo®. Features highlights Optimized performance characteristics at the lowest possible audible noise levels. Hybrid copper base, thin aluminum pin heatsink: the massive 1/2" thick copper base provides superior heat capacity for unparalleled stability in extreme load 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. Quick and easy fan installation: the fan installs "in a snap" with convenient snap-in rivets. 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 MCX775-V™ is designed to operate with 80mm fans only. Test data shows that 80mm fans perform in general better than 92mm fans with this heatsink, and at lower noise levels. Back to top Motherboard and CPU compatibility Processor Compatibility: all Intel® Pentium® 4 socket LGA 775 Motherboard compatibility: All (1) Intel® compliant motherboards socket LGA775 form factor Rack mount chassis compatibility: 2U and above.   Back to top Performance data Suggested fans. The MCX775-V™ heatsink is intended to cover the widest possible variety of uses, from low noise to serious overclocking operations. As such, it is sold without fan to allow users to customize the product to their particular application. For user convenience, we separate all our bench tests into 3 distinct categories characterized by the fan's audible noise level: Low noise operations: ~28 dbA - For non-overclocked processors. The MCX775-V™ surpasses all known temperature specifications published by Intel® to this date. Nonetheless, due to the high thermal load requirements of the Intel® Pentium® 4 "Prescott" class processors, minimum 30 CFM fans are required. Medium noise operations: 29 dbA to 40 dbA - For mild overclocking levels depending on the fan selected, or high temperature environments. Up to 110 Watts processor load. High noise operations: 40 dbA and up - For serious 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 .250 Medium noise category - Lower C/W is better Brand Part # CFM dbA Heatsink-fan °C/Watts ratio (*) Delta 80x25 AFB0812HH 37.4 34 0.226 High noise category - Lower C/W is better Brand Part # CFM dbA Heatsink-fan °C/Watts ratio (*) Vantec 80x38 TD8038H 84.1 55.2 0.145 * 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. Back to top Heatsink specifications CNC machined, C110 copper base, 3"W x 3.3"L x .500"H, flatness better than 0.0003", micro surface finish 8 or better. 374 Helicoid Pins made of High Thermal Conductivity Aluminum Alloy, press fitted in the base. Heatsink base dimensions 3"x3.3"x1.66" Heatsink top dimension 3 3/4" x 3 1/2" Weight: 22 oz (620g) Overall height (with an 80x25mm fan and fan guard): 2.83" Back to top Suggested Retail Pricing Consumer sales: 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 retention Fan hardware for 80 mm fans MCX775-V™ No Yes Yes $59.00 Back to top