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4870 and 4850 crossfire?

All modern Intel boards (Intel P45/X38/X48/X58/Skulltrail) can do it, so can the AMD 7-series chipset boards I believe.
 
Yes, but check which board as not all have both slots running at x16 ;) x38 and x48 chipsets are the ones to go for :)
 
The 4870 waits for the 4850 to finish its work before proceeding....not much point.

Just get another 4850 1gb and cf the 2
 
Same here, I had a 4850 1 Gb, now a 4870 1 Gb. 4850 was more than sufficient IMO though, could`ve saved a few bob ;)

Are you thinking of upgrading your board and getting a 4870 1 Gb?
 
I hope its worth doing. I got a 4850 for a cheap price off a certain action site which I plan to crossfire with my current 4870 if it ever arrives...
From the very few reviews on it, it seems faster than two 4850's but only by a small amount. Another 4850 is probably your best bet unless you can get a 4870 for a cheap price.
 
LoadsaMoney said:
It doesn't, with Crossfire both cards can run at their own speeds. :)
Click to expand...

I didn`t know that!

Does the memory however default to the slower card, in this case the GDDR5 would operate at GDDR3 speeds? What would happen if the cards had differing amounts too, say one was a gig and the other half that? I honestly don`t know, not trying to spoil a good piece of advice for us :)
 
yeh it is good if you can get them cheap but it will only run at 4850xfire speeds.

dont know if there is much point at you're rez tho, maybe if you plan to upgrade soon.

my single 4870 handles everything i throw at it at that rez
 
LoadsaMoney said:
It doesn't, with Crossfire both cards can run at their own speeds. :)
Click to expand...

Memory on each card will work at its own bandwidth - however the total amount of memory is limited by the card with the smallest amount.

While both cards run at their own speed - theres a side effect in that it can introduce input latency and/or microstutter and another side effect in that I believe newer drivers use techniques to reduce these side effects that result in reduced performance as alternatively the faster card may wait on the slower one or the slower cards workload become redundant.
 
Well I got my 4870 & 4850 in crossfire but I cannot for the life of me get it working properly. All drivers are installed, crossfire enabled both cards are doing work but the performance is less than that of a single 4870. No idea what the problem is. I want to try the 8.10 drivers as they sound better then 8.11 & 8.12 but they refuse to install on my system. Looks like I'll be selling the 4850 on :(
 
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