I have similar specs and the first Amnesia (Dark Descent, not Machine for Pigs. It will be on a better sale during the holiday season, I promise

). Except, my Pentium dual core is 2.1gz and my brother upgraded my memory to 8 GB instead of 4. The difference is minuscule, and the game ran the same way before the upgrade. I believe the new game has a bit better graphics, but not really that much since it runs on the same engine and is almost a port from the original game. My laptop runs it perfectly fine with low textures, medium shadows and shadow resolution (to keep creepy effect, and also still looks great). I play in 1280x600 resolution because it runs best, but its worth changing if you aren't quite getting the performance or experience you were hoping for.
TL;DR, yes you can run it well, and you should pick up Amnesia: The Dark Descent for $3.99 while you can. If you like it (you will), get the new sequel during the winter sale.
Sources: my observations and brother's techyness (he wrote this post.)