About this Mac shows wrong graphics on Macbook pro 15" late 2011
You could try using gfxCardStatus which will show you in your menu bar which chipset is currently active and let you specify one or the other.
Current MacBook Pros dynamically switch between their two different graphics chipsets depending upon system load and currently active application; for example, the tech specs page of the current MacBook Pro lists the following:

Intel HD Graphics 4000
NVIDIA GeForce GT 650M with 1GB of GDDR5
memory and automatic graphics switching