How Does VRAM Work?

Jul 27, 2013
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Hey Guys!

I'm building a machine with 2x GTX 770s (or probably the 870 if it really comes out in Q1) with 4 GB of VRAM (isn't it really DRAM?) each. I know they don't add up for 8 GB of VRAM, but here's my questions:

What does it even do? I think it stores the instructions on how to draw each pixel or maybe the textures and stuff, but I really don't KNOW for sure...

I was thinking about it, and I could see how more VRAM would help when it comes to higher resolutions, such as 1440>1080, but when it comes to 5760 x 1080, I get lost... Shouldn't it still have to store the same amount of data for each pixel? I know it see's the three monitors as one, but how would that make a difference? Shouldn't it still store the same amount of information to draw the pixels as a 1920 x 1080 resolution, it just has to draw more, right?

Thanks for any help!

P.S. Here is the card I'm looking at: http://www.newegg.com/Product/Product.aspx?Item=N82E16814130925
 

Melderv

Honorable
Oct 1, 2013
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It's responsible for loading the majority of the textures in-game and serving it on a platter for the monitor. Higher quality textures = bigger size files = bigger VRAM requirements. However, most current vanilla games don't require much more than 2GB. You'll be hardpressed to find a game that demands 4GB on its own.

4GB is reserved for triple HD monitors as well. If you're not running that setup, DO NOT get a 4GB card. You'll be paying a ton more for a feature you won't be using. That card is fine, but 2-3GB is a more than enough for a single monitor.