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Crossfire with another 5850.

post #1 of 7
Thread Starter 
Since i plan to CF i have a few questions.

I am going to buy another 5850 but it's not a reference card, while mine is.
It's the VC Sapphire HD5850 VAPOR-X 1GB
It's clocks are a bit higher than the reference card. Like 735 core on the non-ref and 725 on my reference card.

The other thing is, that while i do have 2xPCI-E x16 slots, the second slot is running in x4 mode/speed.
Furthermore, does my chipset have any limitations on Crossfire? It's a 785G.

About the lower bandwidth on the second slot, i've seen a video by Linus in which he tested the 6990(yes the 6990) and the card started getting just a bit bottlenecked at x1 speed.
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post #2 of 7
Your card will be limited on an X4 slot, you'll see about 25 - 30% performance loss, but it should still be worth the gain of crossfire. You can either overclock the other card to the performance levels of the card you're getting, or downclock the card that you're getting to the level of your original card. I would personally go with overclocking, but its all personal preference

Good luck, and enjoy you're new found fps
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post #3 of 7
The difference in clock speed is not an issue, you can run two cards at different speed no problem or just bump your card up to 735 MHz.

Unless you are running super high resolutions (which you don't seem to be) your second card will be fine at 4x I believe. I have seen performance decreases of a few frames per second but not much.

*Edit* Make sure your power supply is up to the extra consumption, you will be right at the minimum requirements.
Edited by tout - 5/13/11 at 7:42am
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post #4 of 7
Thread Starter 
I can live with a few frames loss How about my chipset and the card being non-ref?
AS this chart says something about chipset compat http://game.amd.com/us-en/content/im...ombo_chart.jpg
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post #5 of 7
Quote:
Originally Posted by farmdve View Post
I can live with a few frames loss How about my chipset and the card being non-ref?
AS this chart says something about chipset compat http://game.amd.com/us-en/content/im...ombo_chart.jpg
You're all set, you have the same cards. That's all that chart means, you can run 5850 cards with 5870 cards and with 5970 cards.
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post #6 of 7
I dont think the performance loss of running PCI-E at x4 instead of x16 is anything like of 20-30% more like 5-10% http://www.techpowerup.com/reviews/A...Scaling/6.html Also if your cards are running at different clock speeds the card with the higher clock will always run at clocks of the lower card. As mentioned it wont be diffcult to do a minor overclock to get them to run at the higher clock.
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post #7 of 7
Thread Starter 
Well because of OCing i actually damaged my current 5850. It crashed under load at stock speeds.
Lately it's been stable under load, but i won't risk and won't OC a card. Also, the Vapor-X 5850 is not a reference card thus it most likely features no voltage control for OCing.
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