Can I boot to an external hard drive with Windows OS installed on it to play games?

Hello,
I am getting a Mac in the near future for work, and was wondering if it was possible to take my current PC's hard drive and connect it to the Mac with the high speed thunderbolt cable, then book to the external hard drive to play games in windows. In my research I have not seen much about this. I understand that BootCamp works, and am willing to do this, but with the new Macbook Pros that were released, there is very little storage space for two partitions.
Any help would be great,
Also, I know that the performance would not be stunning, but my performance is already lacking because I only have AMD integrated graphics on my machine.
Thanks

A virtual machine is a software system such as VMware Fusion or Parallels which provides a software environment within which a different operating system, such as Windows can run. The files which make up the virtual machine itself (e.g., where Windows and any Windows based software, such as Microsoft Office, reside) can be located on an internal or an external drive. Only the virtualizing program itself needs to be on the boot drive. The connection between an external drive on which the virtual machine files reside will be faster than the external drive itself if the connection is USB 3.0 or Thunderbolt because the speed of an external HD will be the limiting factor. If the external is an SSD, the connection used might make a difference. But a virtual machine will still be slower than a physical machine (i.e., computer) because  hardware is faster than the software emulation of it whether the hardware is Windows in BootCamp or a real PC, as BobTheFisherman says.
If you mean the new Retina MacBook Pro (Late 2013), the internal storage isn't a hard drive, it's an SSD on a PCIe bus. OWC, among other vendors, may one day develop an upgrade method as they have for the SSD's in earlier rMBP's but for now, what you order is what you get.

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