In January 2010, the Clarkdale and Arrandale processors (based on the 32 nm Westmere shrink of the Nehalem microarchitecture) were released with Ironlake HD Graphics (GMA 5700MHD), and branded as Celeron, Pentium, or Core with HD Graphics.
However, QPI is used internally on these chips to communicate with the "uncore", which is part of the chip containing memory controllers, CPU-side PCI Express and GPU, if present; the uncore may or may not be on the same die as the CPU core, for instance it is on a separate die in the Westmere-based Clarkdale/Arrandale.
Initially the Y series shipped with a Core 2 CULV CPUs; the mid-2010 refresh saw these replaced with newer Arrandale CULV chips.