AC Adapter for T430 -- which FRU to choose

I just purchased an extra adapater for my T430, as well as a docking station.  I used the wizard on the site to select the ac adapater, but noticed that the FRU/Part Number differs from the one that came with the laptop.  All three adapaters (the one that came with the laptop, the extra one I got from Lenovo, and the one that came with the dock station), all have similar output voltages (20V at 4.5A), but the input voltages vary slightly (the original one is 1.2A input at 50/60hz, whereas the two other ones are rated at 1.5A at 50/60hz.  Is this slight difference a concern?
I mainly don't want to risk burning out the laptop.  But again, these are the adapaters that were suggested by Lenovo's site.  They all output the same amount (the 20V at 4.5A).
Should I be concerned.  I cannot seem to find a Lenovo branded AC adapater that exactly matches the FRU / Part number of the one that came with my computer.  Does that FRU maybe indiciate that it was bundled with a computer and NOT sold separately as an additional adapater.
Suggestions, ideas, opinions?  Am I ok to use the other adapaters that I purchased even though the input rating is slightly higher and the FRU/Part numbers are different?  (All power adapaters are the 90W models, which my computer requires since i have the NVidia NVS Quadro video card with nVidia Optimus technology).
Solved!
Go to Solution.

As long as you have a genuine Lenovo 90W (20V x 4.5A) adapter you should  be fine. I don't know why the input current draws differ. It may be that the circuitry in one is more efficient than in the other. Nevertheless what's important is the output voltage and current (or wattage) rating,
Many people use adapters from their previous ThinkPad as an extra adapter for their new one. People in office environments often use each other's adapters, either intentionally or by accident. This sort of interchangeability is common. If it caused damage to ThinkPads then that too would be a common situation and there would be warnings about the risk of swapping adapters. I've never seen either.
Incidentally, even a smaller 65W adapter will power your T430 under most circumstances. But it's simply not powerful enough to power your T430 under all circumstances, e.g. if you're running CPU/GPU intensive work while watching a DVD and charging the battery, all at the same time. 
Cheers... Dorian Hausman
X1C2, TPT2, T430s, SL500, X61s, T60p, A21p, 770, 760ED... 5160, 5150... S360/30

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