Phoronix has taken a look at Sandy Bridge's graphics performance in Linux, you can check it out over here.
"On Wednesday we published our first compute performance
numbers for the Core i3 2100, Intel's lowest-end "Sandy Bridge"
processor at this point. This ~$125 USD processor was a step-up from the
previous generation Clarkdale CPUs (roughly the Core i3 530), but
obviously the Core i5 2500K was still a great deal faster. How's the
Sandy Bridge graphics performance though with this low-end CPU? That is
the focus of today's tests."