May I add two other suggestions? First place, some comparison. On the matter about CRT/TFT monitors: a 17" CRT spends as much as 100-120W, instead of the 50-60W of a 19" TFT. So, by moving to a TFT there is an obvious gain. As for fans, sometimes one thinks "the faster, the better!"....not quite, as "faster" seldom means "hotter" and "louder"! I got this problem first hand when I bought a pair of 2500rpm/0.18A (not-that-silent) fans, which made my computer go hotter! Why? Because this pair of fans made the power supply drain more power (ergo, heat up!) Then i tried a pair of 1000rpm/0.08A (silent) fans, and the computer got cooler again!

So, my first suggestion, check your fans!
The second suggestion, get an Active PFC power supply! With actual tecnology, power losses by heat are a huge problem, which is seldom underestimated by many of us, computer-users. And things only tend to get worst, as chips get smaller and faster! With a Passive PFC or NO PFC power supply, one can loose as much as 25-35%

of energy directly form heat-up of the power supply. With an Active PFC power supply, this value goes down to about 10-15%, which means these power supplies have an efficiency rate of 85-90%! Although this may not seem as much an improvement, the fact is that over one year this alone can make the power bills go down a few hundred bucks. Beleave me, it got my power bill down!!
Best fo lucks!
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