Hello, ive noticed that hypertransport from AMD doesnt seem to be the same as hyperthreading in windows as hyperthreading shows up in windows as 2 seperate cpus, but hypertransport does not are they both the same things tho?
Nope. Briefly, the Pentium 4's NetBurst architecture was designed to scale to high frequencies and incoprorated a lengthy 20+ stage pipeline. There are times when parts of this pipeline aren't in use. HyperThreading is making use of this unused processing power, giving you a half-assed dual-core. HyperTransport is a bus, much like PCI. It simply runs much faster (1.6GHz-2.2GHz, AMD only uses 1.6 and 2.0GHz currently), yet is an 8-bit wide, vs 32-bits on PCI. AMD does not own HyperTransport. HyperTransport is owned by the HyperTransport Consortium, which AMD is a member.
That's because Hypertransport is not the same thing as Hyperthreading. Hypertransport is a very high speed communications bus that is used to connect AMD CPUs to the RAM, and even its internal cores. It is used as a replacement for the FSB where high speed serial connections are needed. The hypertransport technology is not just used by AMD, it can be used for other purposes as well. Hyperthreading is an Intel technology which 'virtually' enables simultaneous multithreading. It doesn't make the processor dual core, but instead gives a virtual core for execution of threads. Its actually been phased out I believe in the latest Intel CPUs.
i noticed that the new dual-core (except the extreme edition) does not have hyperthreading, are they not using it anymore it seems such a good 'invention'
I'll just add on the HyperThreading being moved away from. The Core 2 design uses a much shorter pipeline, so while Intel could implement it, it wouldn't be nearly as effective as to what the Pentium 4 offered. The number of cores on a die is probably going to be the new direction the CPU performance war goes.
Yep, the Pentium 4 had a massive 31 stage pipeline. The Core 2 chips have more in common with the pentium 3/M than the P4.
