The RS6000 7024 Model E20 utilizes a 100MHz, or 133MHz or 166MHz by upgrading to the PowerPC 604 microprocessor. The Model E20 supports 512 MB ECC memory. It has 512KB L2 cache and a maximum of 27.0GB of internal storage. The Model E20 allows eight expansion slots and eight media bays. Frontier offers used and refurbished Model E20s. Call Frontier today or request a quote. 866-226-6344