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ATI crossfire

post #1 of 9
Thread Starter 
I have been starting a bunch of threads lately since deciding to switch to ATI. thanks to all the people that have helped

alright, i just bought a 4870. i know that you can mix 2 cards of the same series with crossfire. so say i mixed a 4870 and a 4850. how does that work exactly? does the 4870 slow down to the level of the 4850? or, does the 4850 "boost" the performance of the 4870?
   
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post #2 of 9
The 4850 will "boost" the 4870.

Basically the frames will be split up, the 4870 will render say frames 1 and 3 and the 4850 will render frame 2.
post #3 of 9
CF makes both cards run at the lower cards setting so if you CF'ed a 4870 and 4850 it would act like 2 4850s
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post #4 of 9
Thread Starter 
ok so witch is right?
   
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post #5 of 9
Quote:
Originally Posted by coltsrock View Post
CF makes both cards run at the lower cards setting so if you CF'ed a 4870 and 4850 it would act like 2 4850s
Sorry mate nope.

http://www.brighthub.com/Video-Games...cles/1216.aspx

Quote:
Crossfire provides several ways to divide 3D rendering work between the graphics cards. The first mode used by Crossfire is 'alternate frame rendering' or AFR which first appeared with ATI's Rage Fury MAXX graphics card, which used two Rage 128 graphics chips to render alternate frames. Crossfire AFR works in a similar fashion; each card takes on the job of rendering alternate frames, with one card rendering odd-numbered frames and the other rendering even-numbered frames.

The second mode of Crossfire is known as 'scissoring' which is similar to the split frame rendering used by Nvidia's SLI mode. In 'scissoring' mode, the screen is divided into two areas so that each half requires a roughly equal amount of work to produce. Each card creates one part of the image, and the slave sends it's work to the primary card for merging and display.

The third mode of Crossfire is known as 'supertiling'. This mode involved dividing the screen into what would resemble a chessboard, with each graphics card processing alternate squares of the board. However, 'supertiling' mode is only found in games that use the Direct X Direct3D API and only graphics cards that both have 16 pixel pipelines each can properly utilise 'supertiling'.
post #6 of 9
Thread Starter 
So it does "boost" performance then? so would adding a 4850 be a good idea? i cant find any benchmarks about mixing th two card anywhere.....
   
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post #7 of 9
Quote:
Originally Posted by kkbob33 View Post
So it does "boost" performance then? so would adding a 4850 be a good idea? i cant find any benchmarks about mixing th two card anywhere.....
Yes, it would boost it quite well. Better than 4850 Xfire, and worse than 4870 Xfire.
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post #8 of 9
if u run a 4870 and a 4850 the 4870 acts like the master card and when that card runs into a wall the 4850 will help backup the master card witch reslut in better fps.
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post #9 of 9
Thread Starter 
thanks guys. thats awesome! much better than SLI

+rep
   
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