Dell 8 Update Manual

AMD™ Processor Update

HT Assist

AMD Opteron™ 24XX and 84XX processors enabled with HT Assist feature

allow faster HyperTransport™ (HT) transfers. However, when enabled,

HT Assist reduces the L3 cache size from 6 MB to 5 MB.

System reboot after enabling HT Assist reports the reduced L3 cache size

and continues to do so until disabled. The HT Assist feature can be enabled

or disabled using your system's BIOS settings.

For information on accessing BIOS settings, see your system's Hardware Owner's

Manual on the Dell Support website at www.support.dell.com/manuals.

HyperTransport Technology

Depending on your system capability, you can set your system's HyperTransport

mode to HT3.

Your system and/or processors may or may not be HT3 capable, depending on

when it was shipped. HT3 technology was added to selected Dell systems in early

2009 and HT3 processors became available in May 2009.

During system startup, the system BIOS checks the system board revision

number and the HT capability of all installed processors. If the system is capable

of running at HT3 frequency, the HyperTransport Technology field in the BIOS

settings is set to HT3 by default. You can then set the field to either HT1 or

HT3, depending on which setting gives you the best performance for your

particular application.

If your system is not HT3 capable, this field is set to HT1 and read only.

July 2009