Running Battlefield 3 off of external SSD via USB 3?


Dec 21, 2012
Hello, Everyone! I currently use a MBPr that has a 256gb internal SSD and installed Windows Server 2008 via boot camp, partitioning only ~60GB so hard drive space is at a premium. I'm just wondering, would it be possible for me to install battlefield 3 onto an external ssd and play via usb 3.0? How much of a speed decrease would I expect to see? Would it make a big difference if I purchased a 7200 rpm drive instead?
I apologize if I posted this in the wrong category.