Hi all, Lately it seems you guys help solve one problem & a new one creeps up. This time it is new graphics card that I just bought. I have 12 Monitor setup that is run by three ATI FirePro 2460 GDDR3 512 MB cards. It is a Dell T-7500 workstation with PCI Express 2.0 slots & 12 GB RAM. I am using Win-7 Ultimate. Each card has 4 ports so each runs 4 monitors. I have been using this setup or last 5 years for charts as well as using other regular applications including playing YouTube & regular videos. I DO NOT play any games at all. I never had any problem with this setup for last 5 years. Recently one of the cards died so I bought a brand new one. But new one has identical specs except it has GDDR5 instead of GDDR3. Now whenever I play YouTube videos, the new card crashes after few minutes. So 4 monitors that are connected to that video card goes blank & also keyboard & mouse freezes. So I have to shut down the system using power button & Restart it & again all 12 monitors start working. But then if I play YouTube videos, new card crashes after a while. Crashing time is random. What seems to be a problem ? Is it because new card has GDDR5 instead of GDDR3 that other two cards have & thus it is not compatible with two other cards ? All cards are identical except the new one has GDDR5 instead of GDDR3. Please help. Thank you.