Nvidia 6200 and SB live

Yesterday i installed my SB live in a pci slot and it works well butt today my nvidia which is on the AGP slot make a error and when i physically checked it its all capacitors are burned. Why this happens can any one explain this? One thing more after that i check my IRQs both NVIDIA and the SB live and more 2 devices use the same IRQ i am running a win xp. Can any one help me. It is bcoz of the shareing a same IRQ?
 
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