PNY OPTIMA 512MB DDR 400 MHz PC3200 Desktop DIMM Memory Module MD0512SD1-400<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Memory capacity upgrade provides improved system performance and responsiveness</li><li>Deliver all the productivity your PC has to offer with PNY Memory</li><li>Compatible with PC3200 (400 MHz)， PC2700 (333 MHz)， and PC2100 (266 MHz) systems</li><li>Helps prepare your PC for running Windows Vista</li><li>Easy installation， Free 24-hour Technical Support， and Lifetime Warranty!</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51Fq0GL6PLL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/5157OZYJA9L.jpg" noproxy>