Answer for:

Why is my new graphics card causing my computer to reboot?

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Oh yes the OS does affect the PSU. Depending on the OS you run you need different amounts of RAM, then depending on how it is set up and how it is using the RAM affects the amount of paging. If you are paging heavily your HDD is being used more. As RAM power drain is negligible then inefficient OS + small RAM will cause higher power consumtion through the use of HDD. If the HDD and the GPU use the same power rails...