I know that some northwood cpu's were sold with hyperthreading enables, and some were sold with them disabled, since all northwood cores had it. it is at all possible to enable it on a northwood that was sold without hyperthreading?
HT is controlled in the BIOS. Those Northwoods that didn't have HT (all those released prior to the 3.06GHz, IIRC, as well as some lesser Prescotts) don't have it. Most motherboards that support HT-enabled CPUs will have HT enabled by default if you put an HT-enabled CPU in it.
ahhh. i was under the impression all northwoods had them, just they were disabled in the core.
It may well be a technical truth that all Northwood cores had the necessary gates and logic for HT, but until the 3.06GHz it would've been cut out of the core, making it functionally missing. There's no way to re-enable a cut trace.
ahhhh. ok great! thanks!
I have heard that to run HT at it's optimal performance it is reccommended to use dual channel ram and SATA hard drives. Is this true?
yellowhampsterI have heard that to run HT at it's optimal performance it is reccommended to use dual channel ram and SATA hard drives. Is this true?
What is true is that dual channel memory performs better than single channel, and that SATA drives have a nominally greater transfer rate than IDE drives. Either enhancement will improve performance on any computer capable of taking advantage of them. Whoever told you that might've been confused: i845 (Brookdale) was a contemporary chipset of the original Northwood CPUs. The 3.06GHz Northwood was the first to feature HT, and was released shortly before i865 and i875 (Alderwood and Canterwood, respectively). Thus, when Intel first released an HT processor, a cutting-edge Intel machine (which would've featured HT) would have needed dual channel memory to perform at it's peak, though not because of the presence of HT.
Ah ok. Thanks for clearing that up mate. :)
No problem :)