Crossfire

[james49]

just recieved my second 4870, when i put it in the slot and connected the power and crossfire bridge, i got no video signal. anyway my catylest control center has no option for enableing crossfire. psu 750 watts, vista ultimate, phenomII 940, 4gb of ram, 22inch viewsonic monitor, 500gb sata hd. any body maybe have an idea for me?

 

[megamanx00]

First try the card by itself to make sure you didn't get a dud card, and be sure to try both PCI-E slots to make sure you don't have a bad slot. If the cards work fine individually then put them both back in and make sure you connect everything right. If your two 4870s are not exactly the same it may help to uninstall and re-install the catalyst drivers.