GTX 300s, PhysX, 3D 120Hz, etc. questions (for the future)

Some time way in the future I see myself buying a GTX 300s so I just have a few questions regarding some Nvidia features.

-ATM I have EVGA GTX 275 personally OC, instead of using it as a paper weight can I use it as a dedicated PhysX card?

-Why are there no 3D 120Hz 1920x1080 monitors? is it because dual DVI can not support that much or is it because video cards presently can not support that much? can HDMI support it?

-If I get two GPUs (GTX 300s and GTX 275) can they be separately OC?

-I know on "normal" ATX Mobos dual GPUs tend to get hot since they are side by side sandwiching eachother, but I have a 90 degrees ATX (Silverstone Raven series), does that eliminate this problem?


-thanks!

1: You can use the 275GTX as a PhysX card, but the GT300 is roumerd to be so insanly powerful, I doubt there will be any significant benifit

2: I've seen a 22" 120Hz moniter...the problem is that such high refresh rates require insanly low Repsonse Times from individual pixels across the entire color spectrum, and most moniters are still "worse then 5ms average in that category...

5ms = .005 sec
120Hz * .005 = .6

What the above means is that a moniter at 120Hz listed with a 5ms best case Response Time will, in the best possible case, experiance no ghosting (the pixels respond 60% quicker then the time it takes to ready the next image). The problem is that in most cases, the highest possible response time will be doube what is listed, so the worst case would be:

10ms = .010 sec
120Hz * .010 sec = 1.2

In the worse possible case, it taxes 120% LONGER for pixles to change compared to the time it takes to ready the next image, so there will be occurences of ghosting. And since getting such low Response Times is expensive, it makes much more economic sense to keep LCD's running at lower refresh rates rather then lowering pixel Response Time.

3: You *should* be able to OC both seperatly, although only 1 could be used to draw graphics. I assume you would be OCing the 275GTX for PhysX purposes...

4: It comes down to cooling on the card. Some cards have better cooling designes then others. At full load, 90C for a GPU isn't too bad, but I wouldn't care to see them get much hotter...

I don't think I believe that rangers. I was under the impression that the "won't be goign for teh high end" rumor (even though it sounds like BS to me) just meant they would not be makign dx11 high end. They would still release a beast of a power card, it will simply be on an old dx API. At the worst I could see teh rumor meanign that the high end super card may be released a bit after the mainstream cards (gt200 die shrinks, or whatever the mainstream end up being).

As for separately overclocking.. No, you can not do that with SLI, at least not really. The cards will both run at the slowest speeds. You can overclock them one at a time, but they will have to both be overclocked or it won't make any difference at all. They will physcially be downclocked. (unless SLI changes)

This is different to how crossfire works.. but teh end result in both is that you get a setup that works as well as an equivalent setup of two of teh slowest cards.

Well, not right away. I don'tthink it would hurt them much more than it did having no dx10.1. Granted, dx11 is a bigger deal but with all of their marketing power they oculd last 6 months without a high end dx11 part (so long as the dx10/10.1 part is faster than ati's dx11).

Regardless, I don't think they are that far behind. They migh thave to delay into the new year at worst, but I can't imagine they would crash and burn so baddly as to miss an entire generation.

Will be interesting anyway.. I hope they don't mess up too bad.. I'd like to not have to pay $700 per card for my next upgrade

atm, my GTX 275 can run all games fine and max (except Crysis since I only have 8xqq and 1680x1050), but I predict that if I start going into the 3D realm, then my FPS is going to drop like a rock, that's why I'm thinking about getting the GTX 300s.