Long awaited Nehalem architecture got its official name: Core i7. InsideHW have
tested two CPUs based on this architecture along with one motherboard based
on X58 chipset also signed by Intel. Code name for X58 chipset is "Tylersburg".
This chipset is made in 65 nm manufacturing process and it is direct descendant of X48 chipset, which means that it belongs to Intel Extreme chipset series.

Source: InsideHW