Intel Haswell Fastest video chip for notebooks only?

Haswell, Intel's upcoming x86 architecture, will be based on the same 22 nm transistors as the current Ivy Bridge chips. For now, it seems that the laptop and desktop processors, slated for Q2 of 2013, will only be available in dual or quad-core versions, making it likely that the Sandy Bridge-E platform will remain the fastest for now.

The most important improvement that the Haswell chips bring about is the video chip. Earlier reports mentioned that the new GPU is up to three times as fast as Intel's current HD 4000 top model. For the Haswell generation, three video chips will be available, the GT1, GT2 and GT3. Oddly enough, the leaked information shows that neither of the desktop processors will feature the fastest GT3 video chip. Two laptop models, however, will feature the chip. One of these processors is intended for Ultrabooks and tablets, while the other is meant for high-end 'regular' notebooks.

Whether this is a big disadvantage for desktop users depends mostly on user preference. Normally, parts of the graphics chip are disabled to create slower versions. Intel does things a little differently, as the GT2 chips are created out of a different wafer as its GT3 models. Furthermore, dual-core and quad-core processors are made using different wafers as well. The advantage is that the chip loses less space and energy to the GPU, leaving more for other components. Perhaps most importantly though is that it allows the chips to be sold at a lower price point.

Platform	Cores	Video chip	Memory controllers	Socket	Max RAM
Desktop	4	GT2	2	LGA	32 GB
Desktop	2	GT2	2	LGA	32 GB
Mobile (performance)	4	GT3	2	BGA	32 GB
Mobile (mainstream)	4	GT2	2	BGA / rPGA	32 GB
Mobile (mainstream)	2	GT2	2	BGA / rPGA	16 GB
Mobile (ULT)	2	GT3	2	BGA	16 GB
Mobile (ULT)	2	GT2	1	BGA	8 GB

Source: http://uk.hardware.info