The Processors
The LGA775 package change brings with it a new naming scheme for the majority of processors that will use it. Current Prescott core CPUs that will migrate to LGA775, along with the first new CPU, the 3.6GHz model, get model numbers starting with a leading digit of 5, followed by a number that represents its standing in that '5' processor family.The numbers aren't comparable to any others, bar those that belong to the same product family. So while you can be sure a Pentium 4 560 is faster than a Pentium 4 540, you can't be sure it's faster, or slower, than a Pentium 4 720.
New Model Numbers
The model numbers for the migrated processors and the new 3.6GHz Prescott are as follows.Pentium 4 560 - 3.60GHz
Pentium 4 550 - 3.40GHz
Pentium 4 540 - 3.20GHz
Pentium 4 530 - 3.00GHz
Pentium 4 520 - 2.80GHz
All of those processors are Prescott core, with all the inherent architectural features they define. Those include 1MB of L2 cache memory with a 256-bit (32-byte) internal bus, 16KB L1 data cache (64-byte cache lines), 12Kµop trace cache and SSE3 instruction support.
They interface with the connecting northbridge host using the GTL+ shared signalling bus at 800MHz (200MHz, 4 data samples per clock), identical to their outgoing Socket 478 twins. The memory controller is still on the northbridge, there's no change there.
Bar the packaging change, nothing else is different compared to Socket 478 Prescott core processors.
The Extreme Edition
The Extreme Edition, using the Gallatin-2M core, also makes an appearance on LGA775, as witnessed by the photography on the previous page. Intel are only supplying the 3.4GHz version on LGA775 initially, with the 3.2 possibly making an appearance at a later date, depending on demand.Summary
To surmise, the new socket initially sees the introduction of a sextuplet of processors; five 5xx-series Pentium 4s using the Prescott core and a single Extreme Edition using Gallatin-2M.Therefore, the Pentium 4 560 is the only brand new processor debuting today, ignoring packaging differences. At 3.6GHz, it takes the Prescott version of the Netburst architecture one notch closer to the 4GHz target Intel are aiming for in 2004, on LGA775.
Celeron processors will also make the packaging switch, but we'll cover those in a separate article. Intel's brand new core, creating the Pentium 4 7xx range on LGA775, is also destined for a separate article.
