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crossfire 4850 with a 4870

No, it's not like SLI where the cards have to be identical and both run at the clock of the slowest card, you can mix and match with Crossfire and it'll use the power of each card.

I'm wondering how a 4870/4850 combo would work in a 16x/4x P35 board with the 4850 in the 4x slot.
 
I wonder if a 4850/4870 combo will scale as well as the benchmarks show for a 4850/4850 combo?

I would think its not worth the extra for a 4870, might as well get another 4850
 
Interesting. So i could ditch the 8800gt in my new build and get a 50 now and then get a 70 down the line. I got an x48 board so ill have 2 x16 lanes. If i stick the 70 in the primary and the 50 in the secondary then any games not using xfire will just use the 70! win all round seeing as the 50's are silly cheap
 
Also crossfire is good as it splits the screen horizontaly so one card works on one half, the other on the other half (if its optimized) the good thing, is that say the 4850 is struggling on the bottom half, then the boundary between where each card is working changes so then lets say the screen has gone from a 50:50 spit. To now the 4870 working on the top 60% of the screen, then the 4850 on the bottom 40%. So this is constantly changing so that both cards are working well. But remeber, this is only the case if the game is optimized.

I've seen that explained in some video, but correct me if im wrong :p
 
I think the 4870 and 4850 in crossfire will be the sweet spot for crossfire as i don't think there will be much difference in the way of speed and you will also see the benefits of the 4870's gddr 5 memory for bigger resolutions over the 4850 crossfire setup. Should also be able to get the 4850 core running the same speed of the 4870 so will be like running 2x 4870's and cost less.
 
I was looking at that .... If I do go down that troute I will probably upgrade the MB to one of the newer X48 chipsets ..

I am assuming the P35 boards are 16x/4x when in Crossfire mode ?
 
the thing that always amazes me is that nvidia makes such a fuss out of SLI .. when i didnt know better i thought sli was far better than crossfire, because ati didn't make a fuss about it.. i mean going on nvidias website they've got a whole section, and competitions devoted to sli.. they clearly market and advertise multiple gpus better than ati....

anyways i thought p45's did 8x, 8x, and since its pcie.2.0 i would have thought thats not much of a hit, just like having dual 16x pcie 1.1 ?
 
ojrules said:
anyways i thought p45's did 8x, 8x, and since its pcie.2.0 i would have thought thats not much of a hit, just like having dual 16x pcie 1.1 ?
Click to expand...

Yeah that's correct, but apparently there's some BIOS issue I think with some P45 boards that have crippled performance atm. So I'd rather wait to see if all the glitches with that chipset have been ironed out before deciding.
 
lozzick said:
Also crossfire is good as it splits the screen horizontaly so one card works on one half, the other on the other half (if its optimized) the good thing, is that say the 4850 is struggling on the bottom half, then the boundary between where each card is working changes so then lets say the screen has gone from a 50:50 spit. To now the 4870 working on the top 60% of the screen, then the 4850 on the bottom 40%. So this is constantly changing so that both cards are working well. But remeber, this is only the case if the game is optimized.

I've seen that explained in some video, but correct me if im wrong :p
Click to expand...

That is one of the 3 modes but crossfire tries to use AFR now by default.
 
Hi all

Can I take this thread down a slightly different road and ask whether anyone knows or has successfully managed to do a crossfire set up with a 3870 paired with a 4850. Got both of these cards knocking about at the moment to go in my X38 Asus Maximus Formula but can't seem to crossfire them as I had done with a pair of 3870's previously.

I guess not compatible for crossfire but I thought you could mix and match with ATI, unlike SLI? Is it because of different drivers or is there a solution?

Cheers :)
 
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