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Question about VRAM

post #1 of 38
Thread Starter 
I want to get a 700 series NVIDIA card, but I'm a little confused about the different cards' VRAM. The 780 Ti, for example, has 3GB of VRAM, but the supposedly inferior 770 has 33% more VRAM than that. Why does a $400 card have 33% more VRAM than a card that costs almost twice as much?

Also, since video cards' VRAM seems to keep going up and up as the years go by, won't the 780 Ti be more of a liability than the 770 in two or three years, given its lower VRAM?

Of course, I don't really know anything about video cards, so I'm not claiming the 770 is the superior card, I'm just trying to understand how the 780 Ti is superior given its inferior VRAM.
post #2 of 38
Quote:
Originally Posted by Aelius View Post

I want to get a 700 series NVIDIA card, but I'm a little confused about the different cards' VRAM. The 780 Ti, for example, has 3GB of VRAM, but the supposedly inferior 770 has 33% more VRAM than that. Why does a $400 card have 33% more VRAM than a card that costs almost twice as much?

Also, since video cards' VRAM seems to keep going up and up as the years go by, won't the 780 Ti be more of a liability than the 770 in two or three years, given its lower VRAM?

Of course, I don't really know anything about video cards, so I'm not claiming the 770 is the superior card, I'm just trying to understand how the 780 Ti is superior given its inferior VRAM.

A GTX 780 ti has the ability to use 3gb of vram with one card, the 770 is lucky to use 2gb let alone 4gb.

You'd need atleast 3 GTX 770s in sli to actually come close to using 4gb of vram.

4gb of vram on a single 770 is pure marketing imo, almost like a GT 620 2gb card:


http://www.newegg.ca/Product/Product.aspx?Item=N82E16814162111



 
Edited by MrTOOSHORT - 1/6/14 at 2:19pm
    
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post #3 of 38
VRAM is only one aspect of a card's performance.

More important is the GPU's architecture and number of cores.

There are entry level cards that have 1/10th the performance of a 780 TI with 2GB VRAM. These entry cards will never be able to fully utilize the VRAM and those cases are solely for marketing.

With the increase demand by games for VRAM in the last year, 2GB is becoming the minimum for 1080p gaming.
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post #4 of 38
Thread Starter 
How can one card utilize more VRAM than another card when processing the same graphics? I thought if the game (or whatever) requires 2GB of VRAM, it would require that much whether the card was a 770 or a 780 Ti.
post #5 of 38
770s come in 2GB and 4GB versions. 4GB versions are for multi-GPU/multi-monitor situations where the cards would be able to produce playable FPS even when more than 2GB is filled up. A single 770 won't yield playable FPS when more than 2GB is filled up. Thus single 770 users opt for the 2GB version (generally).

The 780Ti has a much higher GPU horsepower than the 770 and can produce enough FPS even when more than 2GB is filled up. So, the 770 will actually be the liability in this case.

For single display situations, a 3GB 780Ti is better than even a 6GB Titan in 99.9% cases.

Hope this helps you to have a better understanding of the situation. smile.gif
Quote:
Originally Posted by Aelius View Post

How can one card utilize more VRAM than another card when processing the same graphics? I thought if the game (or whatever) requires 2GB of VRAM, it would require that much whether the card was a 770 or a 780 Ti.
Requirement of VRAM depends a lot on the graphics settings.

That being said, if at a particular setting, a game fills up 2GB of VRAM, a 780Ti would produce more FPS than a 770 would.

Again, at a particular setting, a game may fill up 2.5GB of VRAM and the 770 (the 4GB version of course) may not be able to yield playable FPS, but the 780Ti might. This is how the 780Ti is utilizing more VRAM than a 770.
Edited by ahnafakeef - 1/6/14 at 2:32pm
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post #6 of 38
Marketing...

Nvidia knows that the 770gtx wont have the power to use fully the vram in the future(near) with a slow down of performance,but with the 780ti there will be a bottleneck vram which will make the performance`s card worse at 5670x1080 or higher...and then people with lower performance and lack of higher vram Will need another card.thats my pov
post #7 of 38
Thread Starter 
So basically, if a game requires so much graphics processing that it needs 4GB of VRAM, a single 770 wouldn't be able to handle it anyway?

So, if I get the 780Ti, will the 3GB of VRAM be a problem 3 or 4 years from now?
post #8 of 38
Quote:
Originally Posted by Aelius View Post

So basically, if a game requires so much graphics processing that it needs 4GB of VRAM, a single 770 wouldn't be able to handle it anyway?

So, if I get the 780Ti, will the 3GB of VRAM be a problem 3 or 4 years from now?

In 3 or 4 years, a GTX 780 ti will be pretty slow anyways compared to new graphics cards. But even in that time, 3gb will still be enough for the a 780 ti.

Just like 1.5gb is enough for this almost 4 year old 480 I have for 1200p.
    
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post #9 of 38
It would handle but if it has to use the Total vram and the bus is little compared to another which would easily handle it,would reduce the memory performance and so the general gpu performance


In fact 3gb arent enough for 5670x1080 in current gpu intensive games(bf3,bf4,crysis3,crysis2,metro2033,metroLL)

For 1080/1200p 2gb vram arent enough if you use all filters and graphics effects to maximum available

For 720/768/900p 1gb would be the minimum for the current gen


Btw which will be.your resolution?
Edited by PontiacGTX - 1/6/14 at 2:55pm
post #10 of 38
Quote:
Originally Posted by Aelius View Post

So basically, if a game requires so much graphics processing that it needs 4GB of VRAM, a single 770 wouldn't be able to handle it anyway?

So, if I get the 780Ti, will the 3GB of VRAM be a problem 3 or 4 years from now?
Yes, and yes. Judging by the trend of past generations of cards, 3GB will be a problem in 3 years. Although what resolution you plan on playing at and at what settings also has a huge role to play. Turning down settings especially AA will help you keep the VRAM usage under 3GB.

But again, with a single 780Ti you probably won't even get playable FPS in most games when more than 3GB has been filled up. So it wouldn't have helped much even if you got a 6GB 780Ti.

If it is an issue of budget, get a 780 and save the rest for a later upgrade to a 900 series card in 2 years. No one can tell what the situation will be within 3/4 years so it is impossible to give an accurate timeline as to when 3GB will become obsolete.
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