HP Dc7800 vPro Prerequisites and Trade-offs for the dc7800p Business PC with I - Page 7

The DIMM slots for the Compaq dc7800 Business PC are color coded. The first DIMM slot in channel A is black and all other DIMM slots are white. Populating a DIMM in the black slot insures memory is in channel A. For more information, see "Memory Subsystem Changes" on page 7. MAC (Media Access Control) Address HP Compaq dc7700 and dc7800 Business PCs have two MAC addresses, one for the NIC and another for the ME. This is a change from previous HP Business PCs, which had only one MAC address for the NIC. Trade-offs Intel vPro processor technology delivers many benefits for IT professionals and everyday users. However, as with many new technologies, these benefits are not without trade-offs. Memory Subsystem Changes The management engine uses system memory, much like UGA graphics. It can take up to 16MB from the operating system, not including any installed software running under the operating system or LVMM. Virtualized appliances consume additional system memory, resulting in less usable memory for Windows XP or Vista. The amount of memory depends on the application, but can be as high as 100-200MB. The IT administrator might want to consider a minimum of 1GB system memory for use with future virtual appliances. Since the ME requires power in all sleep states, the memory slots remain powered at all times. The only safe way to add or remove memory modules is to first unplug the unit from A/C power. Failing to do so can cause damage to the system, memory module, and possibly the person changing the memory. CAUTON: Unplug the system before removing or inserting memory modules. Refer to HP service and support documentation before installing or removing memory modules. Power Consumption Once a system is set up and configured (provisioned), the ME and system memory require power even in the sleep states (S3 Standby, S4 Hibernate, and S5 Off). Because of this, an AMT-enabled system consumes more power than a non-AMT system. The additional power consumption is minimized with the Wake-On-ME feature. Wake-On-ME allows the ME to be in an off state while the system is in the S3-S5 sleep states except when there are pending management functions. The user can set the time out value for the ME to go to sleep in the MEBx. You can find more details on Wake-On-ME in the vPro Setup and Configuration for the dc7800 Business PC with Intel vPro Processor Technology white paper, located at the HP Web site at: www.hp.com. 7