Ahoy !
I could not find Steam version on Amazon. ( Both thru the Subsim Link or Direct thru browser ) I checked on the Steam Community Hub and Silent Hunter 5 is listed as N/A
There are several versions of the game on Amazon and as you can see there is a huge variation in prices
I noticed it is now Published by Blacklime Games ( Focus Essential ) as a DVD no idea when that happened. Cannot find much info on them
There is also an option to buy a UPlay Key ( Ubisoft Version )
The is Gold Edition which is just the Standard version patched
Special collectors Edition has dropped to around the same price as other versions . you get a fairly decent *map with Shipping lanes , an *Official Guide book ( Not sure if its the same book reprinted to look aged )
*7 Extra UBoat and Ship Skins but I can't imagine that is the case.
Oh and a Nice looking box
You should have no problems with your system spec I had GTX660 2GB Vram ( Older version of your 960 ) + i5 3570k until upgrading 1yr ago Max Graphics settings no problem WOS v 2.09
Simon
Wolves of Steel