Hardware requirements for Longhorn - mid 2006

[Brave01Heart]

Hi

I have just visited Paul Thurrott's website and read the following:

Here are Microsoft's Longhorn hardware recommendations:

Desktop CPU: 3 GHz Intel Pentium 4 processor with HyperThreading Technology 530 (or higher) or 3 GHz Intel Xeon processor with 2 MB L2 cache, or AMD Athlon 64, Sempron, or Opteron 100, 200, or 800 processor, single or dual-core versions.

Now, I am presently running an MSI 875P NEO-FISR2 m/b with an Intel P4 2.4Ghz 800Mhz with HT and 512MB DDR400 dual-channel RAM and, as you can see from the above, a 3 Ghz Intel P4 with HT
530 (or higher) is recommended. What I would like to know is, what does the "530" after HyperThreading Technology stand for?

In preparation for the Longhorn release, I am thinking of upgrading my CPU to an Intel P4 3.2Ghz 800Mhz FSB HT 1MB Prescott 478 (or 3.4Ghz P4 with same as above or, maybe even the P4 Extreme Edition with 2MB of L3 cache). Does these CPU's meet the 530 requirement above and what does the "530" mean?

Regards

Brave01Heart