120mm cooling is becoming very common, especially if you are running the newest, hottest cores.  Some builders want to keep their heatsink from reaching a pound or more, and the Thermalright SI-97 that OCIA reviews may just be right up your alley, it’s still built around 80 & 92mm fans, and only weighs in at 280g.
“Definitely nothing to block the airflow through the fins. The SI-97 is fairly large, but with its design, it will fit nearly all Athlon XP based motherboards. According to the Thermalright site, the only board at this time that has been determined not to accept the SI-97 is the Gigabyte GA-7N400 Pro2.”

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