Change a G4 power supply

if you're the owner of one of the 1st AGP G4s (100 MHz bus), its power supply often has a 237W power, which is quite enough to add HDs, change CPU for an acceleration card, or use a recent video caed. But the electric input may also get saturated, the tension brought to components therefore decreasing provoking malfunctions, bugs... when the power supply doesn't simply pass away out of exhaustion.
Taking a look at the specs of the latest ATI Mac Edition Radeon 9800, it is highly requested it is supplied with 300W. So if your already use a greedy accelerator card such as Gigadesigns 1.4 GHz there will be a problem. Apple doesn't produce spare parts on demand, and those would be sold anyway at an unaffordable cost if you were to do an exchange.
A solution exists though. It rquires trickling a PC power supply (ATX format) to replace Apple's. this is explained on XLR8 Your mac. This isn't very complicated. Take care to buy an ATX format extra cable, as on a PC the motherboard is usually nearer. To do things well, by the way, why not buy a silent 400 W power supply, it's not much more expensive.