Originally posted by: CaiNaM
Originally posted by: ElFenix
Originally posted by: thilan29
There is someone on this forum (can't remember his name) that has a X1800XL Crossfire without the master card so I think it IS possible without a Master Card.
it depends on whether it's been enabled to do so in drivers or not. the x1600 and x1300 need no master card because the drivers allow xfire without one. i believe that ati enabled xfire without a master card for the x8k series of gpus as well, and maybe even for x18k now
right now it only works with x1300/x1600 cards (RV570 and RV560) - the required composting chip is on all cards, effectively making them all "masters". i believe catalyst 6.4 is required.
it will not work on any other series at this time, and will not work on older cards - they don't have the chip.
there was some rumor that a special driver allowed it to work on
rd580 boards only (regardless of composite chip) as it's northbridge can handle the bus traffic due as it has dual x16.. the there was another snipet stating this "special driver" was a dev tool so ati board partners can test crossfire boards.. so who knows. i haven't seen anything else definitive on this subject, and there's been no official announcement by ati afaik.