In the 640 x 480 resolution, the color quality is at highest 32 bits, and when I put it in 800 x 600 it goes down to color quality high 24 bits, and if I go to 1024 x 768 it goes down to medium 16 bits.
As for the frequency in hertz, I have the choice between 60, 72, 75, 90 hertz. It's set at 60hz.
Am I losing color quality when I choose 800 x 600 at 24 bits compared to before at 32 bits color quality?
I like it better at 640 x 480 even if everything is huge. Why strain my eyes for nothing?
Just as an example, if a person has a 20" TV set and he decides to buy a 27" TV set, he will enjoy a larger picture. If he then buys a 32" TV set, he will enjoy even more his TV especially if he is seated far away. So why would a person buy a bigger monitor and then make the picture much smaller?
In my case, I love photography and photoshop, and I love to blow up pictures and play around with them. Being in 640 x 480, I see so much more. When people post pictures, I can really see it bigger and I enjoy it better that way.
Many years ago when I had my first computer and I had a smaller screen, I was in that resolution, and with time I kept it there, even though I now have a 17" monitor which isn't that big.
I think it boils down to personal taste.
Interesting statistics below
http://www.w3schools.com/browsers/browsers_stats.asp