The video card (AGP Pro) in my Powermac G5 is fritzing out. Pretty sure it's the vram. I was given a video card pulled from a G4 Power mac. It's pinning matches the same on the G5's card, execept for the tab shown in the picture. Can the tab be cut off? Anyone know what it might be for on the card, as it doesn't seem to be part of the AGP system.