Intel 5xx J CPUs and EIST (speedstep)

[jarthel]

A member of an Australian computer forums mentioned that the Intel channel roadmap does not mentioned EIST in the J CPUs.

Also this publicly available page (http://www.intel.com/products/processor_number/info.htm) does not discuss EIST with J CPUs.

Anand's Intel roadmap talks about EDB and EIST for the J CPUs. http://www.anandtech.com/cpuchipsets/showdoc.aspx?i=2256

Which is true?

I need to buy a CPU soon and if EIST will be appearing in Q1 05, I'll just get what's available now.

Thanks

[Petr]

Prescott has hardware support for EIST (MSR version) since first C0 revision and also has support for HW operated EIST. But Intel didn't turn it on even on E0 revision. Only Xeon Nocona (revisions D0 and E0) have EIST enabled (MSR), none of P4s or Celeron Ds do.

From mobiles only 3.33 GHz P4 should have MSR version enabled, lower speeds have older HW operated EIST (that sucks).