That Computer should run Silent Hunter 3, 4 and 5 with no problems but perhaps at a lower graphics setting. Been looking at those myself! Something you might check out is a website that will determine if your computer can run a variety of games:
http://www.systemrequirementslab.com
I found out that Mozilla Firefox doesn't run well at that website and had to use Internet Explorer to get it to work. SH5 is a very good game even with the issues and DRM and I highly recommend it. Be sure to get JSGME and get some mods!