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660ti 2gb essentially 1.5gb?

post #1 of 22
Thread Starter 
So based on my experience I've never seen my 660ti ever use more than 1.5gb of ram.
I looked into it and realized that the 192 bit bus is a mismatch with 2gb ram. it has 3 64 bit controllers for 512mb then what happens to the lat 512mb?

It got me thinking about the gtx 670 how it is has 256 bit bus scales perfect with 2gb and has more bandwidth.

Anyways I only play on 1080p and I use msaa up to 4x. So far I haven't ran into any real lag in any of my games but for some reason I feel like I'm bottlenecking my cards full potential cuz it never goes past 1.5gb.
In practice I probably won't need more than 1.5gb but the card was advertised as 2gb and I feel disappointed.
post #2 of 22
Here is some reading you can do to understand what is going on. http://www.anandtech.com/show/6159/the-geforce-gtx-660-ti-review/2
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post #3 of 22
Thread Starter 
That link only gives speculations of how it might work.
I would like to know if the 660ti can actually push past 1.5gb. I know I haven't done anything yet that could tax my vram, but I'm thinking of playing skyrim with lots of mods and every bit of vram helps.
It is also rumored that the card can drop down to 48gb/s with the last 512mb past 1.5gb. Wow that is such bs. I bought a card that was advertised as 144gb/s and 2gb of ram but instead it could actually be 48gb/s past 1.5gb and only 1.5gb of vram (effectively)?
If so all gtx 660 users need to know about this!
post #4 of 22
Quote:
Originally Posted by AngelSlam View Post

That link only gives speculations of how it might work.
I would like to know if the 660ti can actually push past 1.5gb. I know I haven't done anything yet that could tax my vram, but I'm thinking of playing skyrim with lots of mods and every bit of vram helps.
It is also rumored that the card can drop down to 48gb/s with the last 512mb past 1.5gb. Wow that is such bs. I bought a card that was advertised as 144gb/s and 2gb of ram but instead it could actually be 48gb/s past 1.5gb and only 1.5gb of vram (effectively)?
If so all gtx 660 users need to know about this!

You bought a gimped card. I did too. We knew that the memory bus was divided up unevenly. Nvidia made no effort to hide it.

Honestly, I don't see what the issue is here. If you want full usage, get a GTX 670.
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post #5 of 22
Quote:
Originally Posted by Mad Pistol View Post

You bought a gimped card. I did too. We knew that the memory bus was divided up unevenly. Nvidia made no effort to hide it.

Honestly, I don't see what the issue is here. If you want full usage, get a GTX 670.

I know what you mean and agree that it was clear that 192 didn't go into 2Gb evenly, but I also believe that you can accurately say that Nvidia is not being completely open regarding how they go about doing this.

From the anandtech review I posted above. "And because NVIDIA is continuing to label the internal details of their memory bus a competitive advantage, they’re unwilling to share the details of its operation with us"

Anyway, how I chose to interpret "all gtx 660 users need to know about this!" is that people should read reviews before buying a card.
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post #6 of 22
Thread Starter 
I thought of a clever scheme to make myself feel about about the imbalance/bottleneck of the 660ti 2gb. So I see that there are 2 versions of the 660ti the 2gb and the 3gb. However the 3gb version aligns perfectly with the 192 bit bus.
What I'll do is sometime in the future get a 3gb 660ti for sli.. Then sell the 2gb 660ti and buy another 3gb 660ti for maximum sli performance.
I think this will resolve my "pet peeve" with this sloppy design. I know the 660ti 3gb is not going to be much faster but at least it will perform like it should.. Using 144gb/s all the way and using all 3gb of ram.
But that's just my theory, sound like a plan right guys? Or am I missing something.
post #7 of 22
Thats a pretty dirty trick

My modded Crysis 2 and Skyrim use 2200-2400mb of VRAM. Install some HD texture packs and see what your GPU uses.
post #8 of 22
yes, if u know Chinese, this thread would help u to understand
http://bbs.pceva.com.cn/thread-78487-1-1.html
the last 512M is 64bit, and there is a problem with it
post #9 of 22
Quote:
Originally Posted by AngelSlam View Post

I thought of a clever scheme to make myself feel about about the imbalance/bottleneck of the 660ti 2gb. So I see that there are 2 versions of the 660ti the 2gb and the 3gb. However the 3gb version aligns perfectly with the 192 bit bus.
What I'll do is sometime in the future get a 3gb 660ti for sli.. Then sell the 2gb 660ti and buy another 3gb 660ti for maximum sli performance.
I think this will resolve my "pet peeve" with this sloppy design. I know the 660ti 3gb is not going to be much faster but at least it will perform like it should.. Using 144gb/s all the way and using all 3gb of ram.
But that's just my theory, sound like a plan right guys? Or am I missing something.

You're missing something.

http://www.tomshardware.com/reviews/geforce-gtx-660-ti-memory-bandwidth-anti-aliasing,3283-11.html

The 3GB model of the 660 ti performs worse than the 2GB model, even at levels that use more vram. Stick with your 2GB model.

I'll see if I can find a way to use 3GB of vram.
Edited by Mad Pistol - 2/22/13 at 7:00pm
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post #10 of 22
Thread Starter 
I've looked at it too and I understand it's slightly worse, but the stutter in capping vram at 1.5gb is a lot worse than 1-5 frames average. I plan on playing skyrim a lot and experiment with mods, could possible be my main game and the extra vram is going to be a huge game changer if my theory is correct.
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