Apparently the nexus 5 has been spotted in a GFX bench result. I have no idea how hard it is to fake something like that
Nexus 5 apparently spotted in GFX Bench with Snapdragon 800 and Full HD display
"Listed as the Google Nexus 5, the device has a 2.3 GHz Qualcomm Snapdragon 800 SoC with Adreno 330 GPU and a Full HD display, according to GFX Bench – the listed resolution is actually at 1794 x 1080 instead of 1920 x 1080, with the difference most likely accounting for the on-screen menu buttons"
Here is the link to a search for nexus 5. note the nexus 5 and the gnex. If these numbers are accurate it crushes the gnex