The guys over at www.benchwell.com have a maxwell bench test scene for download. It's a great utility to figure out roughly how your machine specs up compared to others.
Some of the render times and machine specs on there are out of this world!!
The number one spot (Ron Martin)is currently a render time of 5 Minutes 49 Seconds rendered on; (get ready for this)
16 Core Intel Xeon E7330 2.4ghz
Windows Server 2003 64bit
That is one serious system!
I came in at a lowly 32 Min 54 Secs
Apple iMac Intel Core 2 Duo