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ATI HD5670 CROSSFIRE QUESTION

Last response: in Graphics & Displays
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April 2, 2010 11:43:53 PM

I just got a mobo that is crossfire capable, I already have a 1gb ati hd5670 and plan to get a second one to crossfire in a budget gaming system, should I get another 1gb or 512 mb? do they both need to be 1gb for optimum performance?

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April 2, 2010 11:46:28 PM

go for a 1gb model, if you get a 512mb model your 1gb card is gonna use only 512mb of its 1gb video ram.
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April 2, 2010 11:47:38 PM

A 512 will work, your system will see 512 from each card when gaming. Which should not hurt performance at all.

edit: I agree with the statements mentioning higher resolution and AA enabling benefiting from 1 gb vs 512.
5670 crossfire has about the same hardware specs as a 5770.
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April 3, 2010 12:01:10 AM

What resolution do you run at? If its 1920x1080 or higher 1GB will provide a few FPS better, if its less then it doesnt matter as memory wont be a limiting factor, but i would still suggest getting the full 1GB as it means that you get the max potential out of your CF setup and dont end up limiting one of the cards.
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April 3, 2010 12:29:44 AM

With 1GB on both cards you might be able to use some AA and AF
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April 3, 2010 12:47:09 AM

okay thanks everyone for the info, now what if I crossfire a 5670 with a 5770 first will that work,and second will there be any benifit over the 5670 crossfire setup?, also does aa mean anti aliasing? and whats af, forgive my ignorance I've mainly been a console gamer!!
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April 3, 2010 12:49:39 AM

I may just sell the 5670 and crossfire two 5770's!!
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April 3, 2010 12:53:34 AM

That is a better Idea
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April 3, 2010 2:00:51 AM

Or buy a single 5850, which is equal to or cheaper than 2 5770's, and also leaves you the option to add a 2nd 5850 should you ever decide you need more performance later.

As has been stated, matching the amount of memory in CrossFire configs ensures all the memory of both cards will be used. More memory is useful in a few game titles regardless of the resolution, and in most games at higher resolutions. More memory can also allow "eye-candy" such as Anti-Aliasing to be enabled without significant performance loss.
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April 3, 2010 3:12:24 AM

so would a single 5770 or the 5670 crossfire setup be better? I may not be able to afford 2 5770's plus I only have an antec earthwatts 500 watt power supply
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April 4, 2010 5:31:12 PM

Single cards are easier to trouble shoot if/when you get problems, run cooler and use less power. As long as your power supply is of a good quality you should be able to crossfire a pair of 5670's, but your probably better going for a single card solution. Save a bit more and get a 5850.
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April 4, 2010 10:22:51 PM

The HD5770 does most games fine at 1920x1080 so a single one is plenty for most folks.
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April 4, 2010 10:35:37 PM

No need to worry about the PSU. 500w is good enough for a HD 5850.
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April 12, 2010 3:22:02 AM

Best answer selected by jijoslin.
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