Specs for Dell p/n: 061p37 with GDDR5?

Does anyone know if the Dell p/n: 061p37 ( Dell Nvidia NVS 510 2GB Video Graphics Card ) was ever made with GDDR5 RAM)?  And if so, what are the performance specs?  I ran across a seller hawking just such ( p/n: 061p37 with 2GB GDDR5 ) but I can't find specs on it.  All I can find is the old GDDR3 version. 

???

Thanks in advance!

(This has nothing to do with my Latitude 5490, but I can't readily enter a "my product" I don't have yet.)