Cougar Vortex PWM 120 Cooling CF-V12HPB， Black<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Fan Size: 120mm </span></li><li><span class="a-list-item"> PWM stands for Pulse Width Modulation. The 4-Pin connector allows the mainboard to control the fan speed from 800-1500RPM. </span></li><li><span class="a-list-item"> Optimum airflow， air pressure &amp; extremely silent performance </span></li><li><span class="a-list-item"> Innovative blade design focus air flow &amp; optimum cooling efficiency </span></li><li><span class="a-list-item"> Reduce the vibrations efficiently &amp; silent operation </span></li><li><span class="a-list-item"> Air-inlet with optimal aero-dynamical design reducing noisy air turbulences </span></li><li><span class="a-list-item"> HDB runs more smoothly with no friction， make it quietly &amp; durability(MTBF300，000hrs) </span></li><li><span class="a-list-item"> Rubber fixed pins also reduces vibrations (fan run more quietly) and Tool-less makes it easy to mount， with no tools required </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41RtEn1w-dL.jpg" noproxy>