Amd Athlon 64 4000+ Processor Socket 939<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"> 939 Pin architecture </span></li><li><span class="a-list-item"> Get powerful performance for your unique digital experience.The AMD Athlon 64 processor is the first Windows-compatible 64-bit PC processor. </span></li><li><span class="a-list-item"> Built-in support for future 64-bit applications with AMD64 technology </span></li><li><span class="a-list-item"> Guard your data with AMD Enhanced Virus Protection for Microsoft Windows XP SP2 </span></li><li><span class="a-list-item"> HyperTransport technology and an integrated DDR memory controller for maximum performance and system efficiency. </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/212JDAHQPML.jpg" noproxy>