I'm currently running an AMD Phenom II X4 955 based system with a Radeon HD4870 video card on a Thermaltake 430 watt power supply (the 12x supply is rated at 18A). Is this power supply too small for my system, or can I get away with this till I upgrade?
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what are all the other components you use
Yes its to small, a good PSU at 430W may be OK but not one with only 18A on the 12V rail. For example Corsairs cheapest 430W PSU has 28A on the 12V rail which should be OK, I would get a good 500W one to be safe though.