4850 Crossfire

[BSMonitor]

Currently running a Sapphire HD 4850 rig and am looking at adding the second HD 4850. (old ASUS DH Deluxe 975X MB) I know that the Crossfire is mucho better now, but what combinations of cards are valid?

1) 2 of the exact same model?
2) 2 of the same brand, aka Sapphire?
3) any 2 HD 4850 cards by whatever manufacturer

(This is assuming the original clock speed and memory. 625MHz, 993MHz memory, 512MB ram.)

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Second question is, ok, what about the newer versions with higher clock speeds and more RAM? Sapphire has a couple 1 GB cards. Would the connection treat them as 2 512GB cards? Can a 512MB version be CF'd with a 1GB version?

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Third, some HD 4870 cards getting down around the <$200 price range. Is it even worth Crossfiring a HD4870 and HD4850 ?? Would the cards run at each their own specs? Or would the HD4870 be throttled down?

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[videogames101]

I'm positive they must be the same model, but I don't think brand matters.

 

[Rhoxed]

you can use any manufacture's revision of the 4850 OR the 4870 (yes it will work, but the 4870 will act as a 4850 therefore rendering the extra performance/money spent useless)

i run 2 3870's 1 is a sapphire and 1 is a Visiontek both cards have different stock speeds (776/1176 and 800/1200) but they work great together

i have also tried 2 4850's one Asus and one Sapphire and they worked great together also.

 

[GaiaHunter]

All the 48xx should be able to CF together (I'm not 100% sure of 4830+4850/4870, but if I'm wrong someone will correct me soon 😛 ). The faster ones will perform as the slowest ones though.

But yeah, any 2 4850 should CF good.

 

[imported_Asianman]

get it, you won't regret it

 

[sgrinavi]

Originally posted by: Rhoxed
you can use any manufacture's revision of the 4850 OR the 4870 (yes it will work, but the 4870 will act as a 4850 therefore rendering the extra performance/money spent useless)

That's a common belief, however you do get a bit more bang with the mix - ATI HD4870 & HD4850 Crossfire & Mixed Crossfire Performance Review

 

[Peter Trend]

What about HD4870 and HD4870x2 for triple crossfire?

 

[Peter Trend]

Originally posted by: BSMonitor
what about the newer versions with higher clock speeds and more RAM? Sapphire has a couple 1 GB cards. Would the connection treat them as 2 512GB cards? Can a 512MB version be CF'd with a 1GB version?
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Unfortunately the 1GB card would run as a 512MB card 🙁

See http://www.tomshardware.com/fo...70-sapphire-4870-512mb