Lancelot 4865 Tech Notes
BIOS setting
To maintain low noise operation, always set Fan Speed Control to 3-pin Server in the BIOS Hardware Monitor Logic section.
If the system has 4GB of memory or greater, Discrete MTRR Allocation must be enabled in the BIOS Memory Cache section. Otherwise, system performance will be affected.
Hyper-Threading
Hyper-Threading is a technology found in the Intel® Xeon™ processors. Using Hyper-Threading, a single Hyper-Threading enabled processor can simultaneously process two threads of code, improving the performance of multi-threaded code running on a single processor platform. In essence, Hyper-Threading Technology partitions a single processor into two logical processors.
Because Hyper-Threading might reduce the performance of certain application significantly, this feature is disabled by default. ASL highly recommends that one should spend some times to benchmark the application(s) running with and without Hyper-Threading first. If time does not permit, Hyper-Threading should be left disabled. In general, Hyper-Threading works best in the server environment.
Hyper-Threading can be enabled under the Advanced->Advanced Processor Options->Hyper-Threading menu in the BIOS. It is disabled at the factory.
When Hyper-Threading is enabled, the BIOS and Linux will report a total of eight processors in a dual processor system.