ACPI multi- or uni- processor HAL

[carlwu]

I know current P4's with Hyperthreading use multiprocessor HAL for WinXP but what about Athlon 64? I installed WinXP and it defaulted to Uniprocessor.

I'm just trying to figure out why my new rig does not power down...

Thanks!

 

[Nothinman]

P4s with HT use the Multiprocess HAL because they present 2 logical processors, AFAIK no AMD64 chips do that yet so running the multiprocessor HAL won't get you anything and might even cause a slight performance hit.

 

[carlwu]

Yeah that's what I thought. Thank you. I remember hearing some sell point of "hypertransport" with AMD, but thatps probably not the same.

 

[n0cmonkey]

HyperTransport (the other HT) is not the same thing. It's a bus technology, if I understand it right. :beer:

 

[statik213]

Yup Hypertransport is a high speed serial bus.... USB/Firewire on steriods

 

[pelikan]

If you use multiprocessor for an A64 certain benchmarks like superpi and 3DMark01 improve. Its one of the tweaks competitive benchmarkers use.