How much will crossfire help?

[ale555666]

I'm playing Oblivion at very high settings with 8x antialising but my problem is that when I go outside the cities in day time i'm only getting about 20-30 fps. Inside the cities I get an average of about 50-60 fps. Also in the Crysis demo i'm getting about 25-30 fps on Very High but no antialising.
Any idia on how crossfire is going to affect my frames per second?
How much of an increase will it be?
Also will it be better to get a 4870 or a 4850 to do crossfire with my card?
Thanks

System:
Phenom II X3 720 BE
HIS HD 4850 turbo
Asus M4A78T-E motherboard
4GB DDR3 1333Mhz

 

[daedalus685]

There is very little point in cross-firing a 4870 to a 4850 as it will perform identically to two 4850's.

Depending on your resolution you can expect 50-90% improvement with adding another card.

 

[ale555666]

I'm running games at 1280x1024 in an old monitor but I was thinking about getting a better one. Also do you think that prices will drop to around the $70 once the new cards come out?

 

[sdf]

Why don't you lower the AA settings? At 8X do you really notice the difference over the frames compared to 2 or 4X AA?

 

[ale555666]

Why don't you lower the AA settings? At 8X do you really notice the difference over the frames compared to 2 or 4X AA?

Haven't try compering them.

 

[sdf]

Might be worth it before you buy another card especially now days.

 

[jitpublisher]

I think it is really hard to tell any difference at all above 4xAA.
Outdoors, yes Oblivian will kill your frame rates.
Another 4850 would help quite a bit, even at your res.,
If you have an extra $100 you don't mind spending, I would go ahead and get another 4850. Cheap enough, a hundred bucks ain't much. Hell, a tank of gas and decent steak dinner will you set back a hundred these days.