Cisco 3925 UC Sec Bun PVDM3-64,UC+SEC Lic PAK REMANUFACTURED ISM-SRE-300-K9 Internal Services Module (ISM) with Services Ready Engine ISM-SRE-300-K9= Services Ready Engine 300 (512MB MEM, 4GB Flash, 1C CPU) ISM-SRE-300-BUN-K9 Services Ready Engine (SRE) 300 ISM for VSEC-SRE bundle SM-MEM-VLP-4GB 4GB very low profile SDRAM upgrade for SRE (for total 8GB) SM-DSK-COVER Hard disk drive face plate cover for SRE 700 and 900 SM-HDD-COVER Hard disk drive face plate cover for SRE 710 and 910 SM-HDD-SATA-500GB= 500 GB hard disk drive for SRE 710 and 910 SM-SRE-710-BUN-K9 Services Ready Engine (SRE) 710 Service Module for bundles SM-SRE-910-BUN-K9 Services Ready Engine (SRE) 910 Service Module for bundles SM-HDD-SATA-500GB 500 GB hard disk drive for SRE 710 and 910 SM-SRE-710-K9= Services Ready Engine 710 (4GB MEM,500GB HDD,1C CPU) SM-SRE-710-K9 SRE 710 (4GB MEM,500GB 7K HDD,1C CPU) for router bundle SM-SRE-910-K9 SRE 910 (4-8GB MEM,2x500GB 7k HDD,2C CPU) for router bundle SM-SRE-910-K9= Services Ready Engine 910 (4-8GB MEM,2x 500GB 7K HDD,2C CPU) SM-SRE-910-APP-K9 Services Ready Engine (SRE) 910 SM for APP bundles SM-SRE-710-APP-K9 Services Ready Engine (SRE) 710 SM for APP bundles