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Replacing Laptop Power Supply Wattage?

I have an Asus G73J Series laptop but my power supply is causing random, sporadic crashes of my computer. I need to get it replaced, and I was wondering if someone could help me determine the wattage I need to have on my new power supply to run my machine. I need to run some pretty intensive stuff on it so I need a reliable, effective power source.

Intel i7 CPU
ATI Mobility Radeon HD5870 GPU; 1 Gb VRAM
8 GB DDR2 RAM memory
500+500 GB HDD (2 500 gig hard drives)
Bluray/DVDRw optical drive
Running Windows 7 Premium.
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More about replacing laptop power supply wattage
  1. Best answer
    All the specs should be in the power supply it self

    Should list output voltage and amperage

    so Amperage X Voltage = wattage

    So my old Compaq one has 18.5 volts @ 6.5 amps = 120.25 watts.
  2. See if you can get a replacement power brick from ASUS. You may have 2 year warranty and the laptop is still under warranty cover.
  3. thanks guys, really appreciate it. I dont really know much about hardware so i'm gald you can give me some advice:)
  4. Best answer selected by shifty419.
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