Why does my macpro retina say 512mb graphics memory?

I've just recieved my new Mac Pro Retina and am checking all the customisations I made to it have been made. When I look at graphics under 'more info' in the 'About This Mac' menu - it just says Intel HD Graphics 4000 512MB?  I thought all new retina macs came with 1GB NVIDIA Geforce 650M 1GB memory? Am I being dense?

Have since looked in system report - and can see both the built in Intel Graphics on the motherboard AND the NVIDIA card which runs on the PCIe.  I was definately being dense....

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