To test all heatsinks/fans in this comparison, Hi Tech Legion will maintain an ambient room temperature of 22C. Temperatures will be climate controlled in all instances, so there will be no variance in benchmarks. Noctua NT-H1 Thermal Compound will be used for all comparison units. All heatsinks/fans will be benchmarked in the exact case as its comparisons, unless otherwise specified. HTL does not benchmark heatsinks/fans on a work bench - this is an attempt to show real world statistics. Temperatures will be calculated using either Core Temp or IR Thermometer and will all be measured in Celsius. All load temperatures will be at 100%, achieved by using OCCT, which will be run for 10 minutes before temperatures are measured.

In this review, the $99.95USD retail Cooler Master Seidon 240M CPU Cooler will be tested against the following comparison units. The units were tested in succession in the same build, and only results from these tests were used.

  • Phanteks PH-TC14PE - $84.95 retail
  • NZXT Kraken X40 - $99.95 retail
  • Corsair H100 - $119.95 retail


Test System:


System Specifications

  • Processor: Intel Core i5 3570K, 3.4GHz Stock and 4.6GHz OC
  • Motherboard: ASUS Z77 Sabertooth
  • Video Card: Gigabyte GTX 660 Ti OC
  • Memory: 8GB ADATA XPG Xtreme DDR3-2133
  • Case: Fractal Design Define R4
  • Power Supply: EVGA SuperNova NEX 1500W
  • Hard Drive: Corsair Neutron GTX 120GB/Western Digital Caviar Black 750GB
  • Media: LG BluRay Combo Drive
  • Operating System: Windows 7 Ultimate 64
  • Thermal Paste: Noctua NT-H1




  • OCCT x 10 minutes for Load Temperatures