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New at Computers - Need help with decision to tri-fire 5970 with 5870

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Originally Posted by BarbaricSoul
*8/*8 is just fine for crossfireX. His motherboard is plenty capable of tri-fire with a 5970 and either a 5850 or 5870. Keep in mind though, three GPU's don't really add much performance wise, but does do wondering with eliminating micro-stutter if that is a problem.



Quote:
Three- And Four-Way CrossFire
The performance of three- and four-way CrossFire setups not only surprised us, but also managed to utterly convince us that micro-stuttering doesn't have to affect your multi-GPU configuration. For some reason, the third GPU almost always eliminates micro stuttering and has a less-pronounced effect on performance. At least in the games we ran, the fourth GPU is more eye candy than anything, and its contribution is minimal.

From's Tom's

Isn't that what I said?



I don't believe that's entirely accurate. The dual GPU cards like the 5970, 4870 x2. And 3870 x2, all use onboard pci express bridge chips from PLX. The two GPU cores communicate through their own pci express x16 connections provided by that bridge chip. That's why you were able to use these types of cards even in systems with a single pci express slot - systems that did not support crossfire. Or with nvidia chipsets that only supported sli.

The system should indeed be giving each slot x8 speeds, but it should not split from there as it is not necessary.

this is true to my understanding
 

OneMoar

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a single gpu even if it has 2 gpus on the same pcb == one gpu as far as the system is concerned
 
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what really matters is the amp rating on the +12v if its less then 20(per rail) don't even think about trifire ...

I am currently running a Coolermaster 700 W RS-700-PCAA-E3.
Below the +12V, it said it runs a maximum of 52Amps.

Any recommendation on a well-priced PSU?
 

OneMoar

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52 should be enough provided it can actually putout that much I would try it and see what happens
if it gives you problems replace it
 
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52 should be enough provided it can actually putout that much I would try it and see what happens
if it gives you problems replace it

Okay, thanks for the advice.
 
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