Will I be able to use this Power Supply

I originally started building my PC with a 500W PSU installed, however when testing my PC it went dead so I decided to use a PSU from an old computer. This PSU ended up working and so did my computer - it was 170W though.

When I tested my computer for the second time with the old PSU installed, I did not have my Hard drive and Optical drive yet - now I do. Despite it working without the Hard drive and Optical drive, will I be able to use the 170W PSU with them installed? Or should I get another Power supply.

Motherboard: ASRock FM2A75 Pro4 ATX FM2
CPU: AMD A4-5300 3.4GHz Dual-Core
[integrated graphics]

RAM: Kingston 4GB 1333MHz DDR3 Non-ECC CL9 DIMM Memory

HARD DRIVE: Generic Hard Disk Drive 250GB SATA II

OPTICAL DRIVE: LG GH24NS90.AUAA50B 24x SATA Bare Internal DVD Rewriter
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  1. Dont see why the addition of an optical and a HDD would make a difference.
  2. the hard drive will draw about 8 watts , the optical drive less than that .

    but I feel what you are doing carries some risk even if it will boot . The PSU could be running at a wattage that gives you very little head room .
    Heat may kill it relatively quickly
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