The only way to make your current PC draw less power from the AC outlet is by buying a more efficient powersupply. Most PSUs are rated at 70%. The following are examples of 500w PSU that are 85% efficient (most efficient to date):
Antec Neo HE 500w
Seasonic S12 500 - My personal PSU.
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Note: These are just examples. I'm not telling you to go out and buy a 500w PSU especially if that amount of power is an overkill.
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From one of my previous posts:
Assuming a hypethetical PC requires 200w to power the entire system. A 70% efficient PSU will draw 285.7w (200w / 70%) from the AC outlet. A 85% efficient PSU will draw 235.3w (200w / 85%) from the AC outlet. The extra 85.7w or 35.3w are wasted as heat, fear not because the utility company will charge you for that "heat".
The efficiency of a PSU is actually a bit more complicated than a simple single number. A PSU tends to be at it's worse efficiency at low loads. Say a 70% efficient 500w PSU has the following characteristics:
55% efficiency @ 1% - 25% load
60% efficiency @ 26% - 40% load
65% efficiency @ 41% - 60% load
70% efficiency @ 61% - 90% load
65% efficiency @ 91% - 100% load
What this means is that 70% is the peak efficiency. As you can see this imaginary 500w PSU is at it's most efficient when you put a 61% - 90% load on it. That translates to a load of 305w to 450w. Below 305w the PSU is less efficient. Above 450w and again your PSU is less efficient. Beyond 500w... start saving money for replacement parts.
Getting back to the 200w load this hypethetical PC puts on a 500w PSU, this means that there is only a 40% load (200 / 500). Based on the above specs, the PSU will only be 60% efficient. The imaginary PC will be actually drawing 333.33w (200w / 60%) from the AC outlet. Of which 133.33w are being wasted as heat.
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