4850x2 + 4850 crossfire

Xlick · Dec 26, 2008, 03:41 PM

will a crossfire setup between these two cards be worth it

Sapphire 4850x2 - 1gb
http://www.newegg.com/Product/Produc...82E16814102813

Asus 4850 - 512mb (what i have right now, no longer on new egg or i'd have linked that)
http://www.pixmania.co.uk/uk/uk/1307...512-mb-gd.html

will it be a waste of money vs just getting a second 4850?

what will the total memory and processing power?

will it act almost like 4850's in tri sli?

Treeckcold57 · Dec 26, 2008, 05:01 PM

Quote:

Originally Posted by Xlick

will a crossfire setup between these two cards be worth it

Sapphire 4850x2 - 1gb
http://www.newegg.com/Product/Produc...82E16814102813

Asus 4850 - 512mb (what i have right now, no longer on new egg or i'd have linked that)
http://www.pixmania.co.uk/uk/uk/1307...512-mb-gd.html

will it be a waste of money vs just getting a second 4850?

what will the total memory and processing power?

will it act almost like 4850's in tri sli?

You need an ATI 4850 1GB because of the ATI 4850X2 would read 512MB.

Sobek · Dec 26, 2008, 08:12 PM

Well I don't have any experience with such a setup, but if past evidence is anything to go by, it's probably the best choice of setup. I recall in many cases with the 3870x2 and sometimes the 4870x2, doubling up on those cards actually resulted in worse performance than simply using an X2 crossfire'd with another single-core card. I can only imagine that with two X2's, there must be some serious bottlenecking.

Hopefully someone will bench a 4850x2 + 4850 Crossfire setup eventually... I'm curious myself.

Sudz · Dec 28, 2008, 11:36 AM

So the 48xx's are capable of tri-fireX, as long as they're 1gig's?
Has anyone got any links to proof of this?
I've tried the tri-fire with my 4870x2 and a 4870 512. It didn't turn out to be good.

caveman-jim · Dec 28, 2008, 01:01 PM

The reason for wanting all the same memory size is that the drivers have to use lowest common denominator for all three GPU's; clock speed, memory speed, memoy size. So if you have a 512mb card and two 1Gb cards, the 1Gb cards will effectively only use 512mb as otherwise AFR won't work.

I haven't seen any succesful HD48x0 series tri-fire yet, but I'm sure somebody has made it work.

Sudz · Dec 28, 2008, 02:03 PM

"but I'm sure somebody has made it work"
If they have, they sure have kept it a secret. I've googled this and came up with info on tri-firing with a 512.

Antman56 · Jan 28, 2009, 09:31 AM

Quote:

Originally Posted by Sudz

"but I'm sure somebody has made it work"
If they have, they sure have kept it a secret. I've googled this and came up with info on tri-firing with a 512.

I got it to work. I actually wrote the most thorough article using a 4850X2 + 4850 in TriFire I have seen to date. I have compared a single,dual, and triple crossfire, the effects of overclocking, and cpu scaling amongst many recent games and benchmarks. Check it out (it is detailed and should clear up ANY ideas you may have had for it) http://www.tomshardware.com/forum/25...x4-4850x2-4850

Dec 26, 2008, 03:41 PM	#1	Advertisement (Guests Only) Login or Register to remove this ad
Xlick Newbie Join Date: Dec 2008 Posts: 2	4850x2 + 4850 crossfire will a crossfire setup between these two cards be worth it Sapphire 4850x2 - 1gb http://www.newegg.com/Product/Produc...82E16814102813 Asus 4850 - 512mb (what i have right now, no longer on new egg or i'd have linked that) http://www.pixmania.co.uk/uk/uk/1307...512-mb-gd.html will it be a waste of money vs just getting a second 4850? what will the total memory and processing power? will it act almost like 4850's in tri sli?

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Dec 26, 2008, 08:12 PM	#3
Sobek HD2900xt Crossfire Join Date: Jul 2007 Location: Queensland, Australia Posts: 415	Well I don't have any experience with such a setup, but if past evidence is anything to go by, it's probably the best choice of setup. I recall in many cases with the 3870x2 and sometimes the 4870x2, doubling up on those cards actually resulted in worse performance than simply using an X2 crossfire'd with another single-core card. I can only imagine that with two X2's, there must be some serious bottlenecking. Hopefully someone will bench a 4850x2 + 4850 Crossfire setup eventually... I'm curious myself. __________________ No, I will not fix your computer. C2Q6600 G0 @ 3.60ghz / 2gb OCZ Reaper HPC Pc6400 / Asus HD4870 / Gigabyte GA-X38-DQ6 / 850w Antec TruePower Quattro

Sobek's System Specs
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Dec 28, 2008, 11:36 AM	#4
Sudz Radeon HD 4830 Join Date: Mar 2001 Posts: 113	So the 48xx's are capable of tri-fireX, as long as they're 1gig's? Has anyone got any links to proof of this? I've tried the tri-fire with my 4870x2 and a 4870 512. It didn't turn out to be good. __________________ P5K-Prem/Q6600..............DFI LT X38-T2R/E8600 2gig Crucial 6400..............2gigZ Crucials 8000 Sapph3870x2...................4870x2 X-Fi Elite Pro.....................H2O cooling 74raptor/320Seagate.........WD 36 Raptor BFG 800 watt.....................Ultra x-3 1000 wattr

Dec 28, 2008, 01:01 PM	#5
caveman-jim Rage3D Technical Writer Join Date: Oct 2003 Posts: 29,060	The reason for wanting all the same memory size is that the drivers have to use lowest common denominator for all three GPU's; clock speed, memory speed, memoy size. So if you have a 512mb card and two 1Gb cards, the 1Gb cards will effectively only use 512mb as otherwise AFR won't work. I haven't seen any succesful HD48x0 series tri-fire yet, but I'm sure somebody has made it work.

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Dec 28, 2008, 02:03 PM	#6
Sudz Radeon HD 4830 Join Date: Mar 2001 Posts: 113	"but I'm sure somebody has made it work" If they have, they sure have kept it a secret. I've googled this and came up with info on tri-firing with a 512. __________________ P5K-Prem/Q6600..............DFI LT X38-T2R/E8600 2gig Crucial 6400..............2gigZ Crucials 8000 Sapph3870x2...................4870x2 X-Fi Elite Pro.....................H2O cooling 74raptor/320Seagate.........WD 36 Raptor BFG 800 watt.....................Ultra x-3 1000 wattr

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