Cheap way to support dual monitors

I have an hp desktop at my work and two monitors. The motherboard just has one vga slot and no video card but there is an empty pci 16x slot. Also the power supply says max power: 320 watts. Processor is a core 2 duo.

I saw an evga geforce gt 610 for $40 on amazon but it says min power of 300watts so I don't know if that's safe for my setup.

This doesn't need to do any heavy graphics work I just want two independent screens. Price range of $50 or preferably lower. Thanks!
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More about cheap support dual monitors
  1. PCPartPicker part list / Price breakdown by merchant / Benchmarks

    Video Card: EVGA GeForce GT 620 1GB Video Card ($43.98 @ Newegg)
    Total: $43.98
    (Prices include shipping, taxes, and discounts when available.)
    (Generated by PCPartPicker 2013-08-28 13:19 EDT-0400)

    will work fine on 320W
  2. Best answer
    a decent gpu will be a better idea than those external adapters
  3. I would just go for a cheap graphics card. I've got a Radeon HD4350 that runs only dual monitors. Something cheap like so is fine for productivity.

    You'd be fine with that. It uses hardly any power, especially if you are just doing productivity stuff.
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