PC games I can play with no sound?

Looking for some suggestions for games that I can play on the PC with the sound disabled without losing too much of the experience. I've got a great gaming PC but I don't use it nearly as much as I should because my girlfriend is normally watching tv in the room with me. I don't want to play a game like Mass Effect 2 with no sound so when I do I throw on headphones. I'm looking for some suggestions for games I can play without worrying about missing too much with the game muted? I normally just go with shooters that I can play online but that gets old quick. And sadly I'd imagine the Fallout games would be gigantic mistakes. :(

Any suggestions?

Morrowind. Since its mostly text I play it all the time with music/podcasts over it.

Trackmania, i play with no sound while listening to bombcast. also memoir 44, free to play board game. and Civ 5 too.

Umm... I can't really recommend a colossal game because the sound design and dialogue and effects are usually superb in such great games. 
 
Your only choice is open world games/platformers, really, because they're about the action rather than story/atmosphere, which usually requires sound.

• Just Cause 2 (time sink, explosive fun) 
• GTA IV 
• Red Faction Guerilla 

• Prince of Persia: The Forgotten Sands 
• Mirror's Edge 
• BIT.TRIP RUNNER 
• Trine

• DiRT 3 
• Burnout Paradise 
• [insert your favorite sport here]

I like to listen to podcasts while gaming quite a bit, so I deal with this issue a lot. I mostly buy cheap games I've played before on Steam (I already know what's going to happen, so I don't have to worry about story). Still, it's difficult to say what an acceptable amount of missing story is. The only thing I could really give ya is a list of everything I've played with podcasts and provide a few reasons why. Firing up Steam...

-Chime (music a lot of the experience, but after a while the music gets old.)

-Just Cause 2 (story in this was so stupid early on I decided I'd enjoy the game much more without sound anyway.)

-Need For Speed: Hot Pursuit (Story is really nonexistent, and podcasts are way better than EA trax).

BioShock 2 (second playthrough...)

Borderlands (again, playthrough 2, but I don't think you're missing much if you have subtitles on)

Burnout: Paradise (See NFS)

DiRt 2

Jamestown (story's nice, but not necessary)

Resident Evil 5 (second playthrough, but you're not really missing much)

Super Meat Boy (again, not missing much)

Torchlight (See above)

Trine (See above)

Universe Sandbox (game literally has no sound)

It's a partial list, as I've omitted things that would probably fall under the BioShock 2/RE5 category, but that's what I've got. Hope you enjoy!

Audiosurf!

Hmmm... what about Two Worlds II? Is sound important to that?

OpenTTD. If you can like tycoon games, this free version is the best of them. And unless your into funky jazz you wont miss out on anything.

Eufloria,  
FIFA 11/12  
 
Any sandbox game.

Peggle

Most any MMO, Civilization or other TBS games. You may even get by playing the Total War series without sound but, come on...generals speeches are worth the whole battle sometimes.

Warcraft 3 Multiplayer
World of Warcraft
Minecraft (Even tho sound/music is awesome)

I don't know what kind of games you like, since you've only really mentioned RPGs in your post. I'm looking at my Steam games list and I can see a ton of games I have played without sound. I'd suggest puzzle games (Space Chem, Puzzle Quest Plants v.s. Zombies), strategy games (Civilization Series, Frozen Synapse, Rise of Nations), racing/sports games (Need for Speed)  and action games (Assassin's Creed, Serious Sam Series, Quake series, Doom series) roughly in that order for viability without sound and their ability to tolerate interruptions.  Almost every game released either has text or subtitles on by default or as an option, so pretty much any game can be played without sound but I would generally stay away from games with lots of dialog or online play.

Peggle

Nethack

Dwarf Fortress

Frozen Synapse

Team Fortress 2, Just Cause 2, and Minecraft are my top 3.

If you like old pc rpgs, things like Baldur's Gate 2 can be played without sound.

I turned the sound off while playing Dungeons of Dredmor; the in-game music is pretty mediocre and doesn't really add anything to the atmosphere.

Driving games/strategy games.

Bumping this year old thread. Same situation, but any recent recommendations? Been enjoying Civ V and Torchlight games.