HP Dc7800 Service Reference Guide - HP Compaq dc7800 Business PC - Page 178
Memory, SODIMMs, DDR2-SDRAM SODIMMs
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Memory The computer comes with double data rate 2 synchronous dynamic random access memory (DDR2SDRAM) small outline dual inline memory modules (SODIMMs). SODIMMs The memory sockets on the system board can be populated with up to two industry-standard SODIMMs. These memory sockets are populated with at least one preinstalled SODIMM. To achieve the maximum memory support, you can populate the system board with up to 4 GB of memory. DDR2-SDRAM SODIMMs For proper system operation, the SODIMMs must be: ● industry-standard 200-pin ● unbuffered PC2-5300 667 MHz-compliant or PC2-6400 800 MHz-compliant ● 1.8 volt DDR2-SDRAM SODIMMs The DDR2-SDRAM SODIMMs must also: ● support CAS latency 5 DDR2 667 MHz (5-5-5 timing) and CAS latency 6 DDR2 800 MHz (6-6-6 timing) ● contain the mandatory Joint Electronic Device Engineering Council (JEDEC) specification In addition, the computer supports: ● 512Mbit and 1Gbit non-ECC memory technologies ● single-sided and double-sided SODIMMs ● SODIMMs constructed with x8 and x16 devices; SODIMMs constructed with x4 SDRAM are not supported NOTE: The system will not operate properly if you install unsupported SODIMMs. Refer to the Computer Setup (F10) Utility Guide for information on how to determine the processor bus frequency of a specific computer. 166 Chapter 9 Removal and Replacement Procedures Ultra-Slim Desktop (USDT) Chassis