|What the higher resolutions are for a particular video chipset varies, of course.|
My point is, if you don't benefit from having more memory on the card with the monitor or display you're using at the max resolution where things are not too tiny, there's no advantage to you of the card having more ram and you paying more for that.
I just looked on the web and found it's difficult to find the specs about
- what resolutions a particular video chipset supports
- fps ratings for the same video chipset / video card with different amounts of memory on the card
fps ratings, of course, depend on what software you're testing the video chipset with.
E.g. with a video benchmark test I did the other day on a friend's system I was working on, a Radeon 4850 512mb card produced an average of about 350 fps over 3 minutes at whatever resolution it was testing at, 22 fps at the same resolution for the same system's onboard Radeon 3200 video chipset.
I just looked at the boxes of a few video cards with ATI video chipsets that I have.
What they do rate is the standard resolutions the video chipset supports and what the max vertical refresh rate is at each resolution..
A relatively older made by ATI AIW card with a Radeon X600 Pro video chipset.
256mb DDR memory
640X480, 800X600, 1024X768, 1152X864 - 200 Hz max vertical refresh rate.
1280X1024 - 160 Hz
1600X1200, 1920x1080 - 120Hz
1920X1200 - 100 Hz
1920X1440 - 90 Hz
2048X1536 - 85 Hz
As I recall from research I did years ago, the more memory on the card, the higher the max vertical refresh rate at the higher resolutions, the max at the lower resolutions were identical to cards with the same video chipset with less memory.
The max vertical refresh rate at a particular resolution is directly proportional to the max rate for a particular fps test.
I have only one LCD monitor, a 5 year old Samsung, 6O Hz max vertical refresh rate at it's "Native"or "Optimal" resolution.
I've never had a CRT monitor that was capable of more than, say, 150 Hz vertically.
For the LCD displays, the cheapest have a 60 Hz vertical refresh rate at their "Native"or "Optimal" resolution, which is usually also it's max resolution.
More expensive models have a 120 or 240 Hz vertical refresh rate at their "Native"or "Optimal" resolution.
The only modern displays I know of that can exceed that are the Plasma displays - 640 Hz.
The higher the max vertical refresh rate, the better video motion looks (it's less blurred).