crossfire....

[bodybag]

Hi

Just a quick question about crossfire on 2 4870's....

how do you overclock?, will CCC show 2 different cards?, and what happens if 1 GPU is clocked higher than the other?

NOOb questions i know, but I have never owned xfire/sli before!

thanks in advance!

 

[gareth170]

Hi

Just a quick question about crossfire on 2 4870's....

how do you overclock?, will CCC show 2 different cards?, and what happens if 1 GPU is clocked higher than the other?

NOOb questions i know, but I have never owned xfire/sli before!

thanks in advance!

yes CCC will show the 2 cards..

some people say if 1 card is clocked higher it'll underclock it to the slowist card. but i don't agree. my 2 4850 run at they own speeds. e.g if i clock 1 to 650/1000 & other to 745/1100, both work at they own speeds.

 

[bodybag]

yes CCC will show the 2 cards..

some people say if 1 card is clocked higher it'll underclock it to the slowist card. but i don't agree. my 2 4850 run at they own speeds. e.g if i clock 1 to 650/1000 & other to 745/1100, both work at they own speeds.

Thanks for the reply.....

 

[LoadsaMoney]

yes CCC will show the 2 cards..

some people say if 1 card is clocked higher it'll underclock it to the slowist card. but i don't agree. my 2 4850 run at they own speeds. e.g if i clock 1 to 650/1000 & other to 745/1100, both work at they own speeds.

Your right, it won't underclock to the same speeds of the slowest card, as the speeds don't matter, it will still run the same as it though, as with Xfire/SLi, both cards have to run in sync, so even though you have a faster card, that faster card has to stop and wait for the slower one to catch up all the time, so they may as well be running the same speeds, where as with Nvidia, they get the syncing by either downclocking, or overclocking automatically one of their cards speeds so they match, thus you don't have to have a card waiting

 

[AMG]

if you wanna overclock them, you have to do each card separate

 

[gareth170]

Your right, it won't underclock to the same speeds of the slowest card, as the speeds don't matter, it will still run the same as it though, as with Xfire/SLi, both cards have to run in sync, so even though you have a faster card, that faster card has to stop and wait for the slower one to catch up all the time, so they may as well be running the same speeds, where as with Nvidia, they get the syncing by either downclocking, or overclocking automatically one of their cards speeds so they match, thus you don't have to have a card waiting

yeah thats right. but for some reason i see between 5-7 extra fps when i clock 1 higher.. e.g 1 of my cards can do 700/1200 & the other can do 745/1125, so if i clock them to that i see between 5-7 extra fps but if i clock them too 700/1125 i lose the 5-7 fps