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The launch date for the the Intel Atom Processor N550 the third quater of 2010 and you can find the fulls specifications of this processor here:
Since the processor Intel (R) N550 seems to be from the Pineview family, it seems to be quite clear that it would be using the same GFX engine like the other Pineview family CPUs N450,D510 etc.
Besides the Pineview CPU has got different Device ID compared to the one with GMA500 which is on Poulsbo chipset.
The Pineview CPU adapts to the Gen X GFX architecture compared to GMA500 which adapts to the PowerVR. They uses a completely different driver.
All the best,