i traded in my 465 sli setup for 770 and im very pleased with doing so

Wouldn't the VRAM stack up between the cards though?

And at what point would I need more VRAM

Really depends on what you want to do and how high you want any eye candy (as OV3RCLK4 stated).  When you SLI cards, you will be limited to the lowest amount of VRAM.  I have 580 SC's and have about half a dozen texture mods in Skyrim.  In some areas, where the increase in texture and scenery is heavy, my FPS drop drastically and the game starts to stutter.  Even before I loaded those mods, I would see my VRAM come close to maxing out.  The newer games, especially on high/ultra settings, can really put some stress on the VRAM. 
 

No. The system ram is too slow for this. That is why people get massive stuttering in games when they go over their Vram limit. The game starts using your system ram and its just not fast enough.

So I'll probably save up for dual 4gb 760 acx sli'd

OV3RCLK4

Either that or 670 4GB SLI. The 670 is still a little bit faster than a 760 and there is also a chance the 670 will overclock to be faster than a GTX 680. If you do any type of game recording I recommend the 700 series because there are some new features that allow you to record gameplay with less fps drops than DXtory or Fraps.

 
 
I think you're talking about Shadowplay.  Its integrated to Kepler Architecture.   So 600/700 series and up will have it. Not released yet but soon.

Gomez99

So I'll probably save up for dual 4gb 760 acx sli'd

No really. What resolution will you be playing at?
I play at 1920 x 1200 and 2 GB is plenty for cyrsis 3 and BF3. What games do you play?
Even at this resolution my sli 480 (1.5 gb) was enough in the game noted above. If you play at 1080p then
2 gb is plenty

Solar Trans

I used SLI 570s with 1280MB of VRAM, and with max everything BF3 was around 100FPS at 1080p (they were at 925MHz core/2050MHz memory). There was some stuttering, but in only happened if I was in the side of a helicopter really high up looking at a large area of land. It was a pleasant experience, but I like my single TITAN better. IMO 2GB isn't enough for current gaming at 1080p. I use around around or above 2GB in every game I play. I would recommend you buy 2 new GTX 670FTW 4GB models off of eBay for around $300 each, as they are more powerful than the 760 by a fair margin and in the same price range. Don't, however, buy them from ANY retailer's website as they are not worth what they are asking. You still get your warranty benefits if you buy off eBay so that is good too.

You use over 2GB of ram @ 1080p?
Can you provide some screen shots?
I ask because I play at 1920 x 1200 and I see 1.8 gb and that is in crysis 3 and BF3. I know there is one game that uses a lot of ram but you said in every game you play.
Let me see it.

Have you already looked up reviews of GTX760 that include a single GTX460 to compare with, for instance this Anandtech review?
 

 
Numerically, 760 is an effective double 460, but in SLI scaling rarely goes up 100%; so at least in Crysis 3 single-player at 1080p, 760 is faster than 460 in SLI.  But if playing in multi-player, the game would be CPU-bound and the scaling won't be as high.  Also, resolution is mainly a factor if we are concerned with making games CPU-bound on top of played single- or multi-player.
 
At that point your CPU and its overclock (if any) matter much more than a new graphics card.  Remember, your CPU runs your games and only the CPU tells the graphics card what to draw; don't expect one change to make all the difference in your games unless you had integrated video before.

Carlitos714
If you play at 1080p then 2 gb is plenty

Be specific.  To say "If you play at 1080p then 2 gb is plenty" assumes time pretty much stops as if no future games will use more resources than today or that the OP won't get new games.  But history has shown that future titles always use more resources, which is why we get better hardware, but the resolutions haven't been changing over the years. 
 
It wasn't long ago that 1GB was plenty for 1920x1200 and 512MB was once plenty for 1920x1200.  The only real changes are the games themselves and the graphics cards.  The likelihood that 4GB is plenty for 1920x1200 in a few years is very high, the question is will someone keep their hardware unchanged that long?  Well the OP is still holding onto a single 460, in which the type first debuted just over three years ago.  Better to plan ahead.

All I've played so far is Hitman Absolution, but I'll update it.
IDK if you can see it but:
http://imgur.com/PUbVrOz

Thank you for reviving this old thread. I tried running some of those with 2gb and i can't unless it turn down the settings