先列出我的電腦配備：
C P U：AMD AM2 4200+ 2.2G
記憶體：DDR2 800 1G*4 (總和4GB)
主機板：GA-MA69G-S3H (內建顯示)
硬 碟：3.5吋的三顆，共730GB (加上兩片IDE轉SATA的轉接卡)
光碟機：18X的DVD燒錄機
Power：海韻S12II 330W
因為近期想換高階的顯卡，在版上和電腦商場聽到很多人說至少要換400甚至450瓦以上的Power，但若換大瓦數的Power 勢必又是一筆可觀的預算，所以我用勾式電錶量了一下目前電腦上所需的最大電流，再乘以電壓就是瓦數。
結果很令我意外地，電腦的最高耗電僅1A (是開機期間的峰值，跑3D Mark反而只有0.8A)，乘以電壓110V則為110W，若另外再加個100W的顯卡，依目前330W 的Power 來說可謂綽綽有餘，所以實在困惑真的需要換到高瓦數的Power 嗎？
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Cheaper cases often come with cut-rate power supplies that may not be up to the task of powering a high-end PC. View our Guide To PC Power Supplies for more information. Some expensive cases don't come with a power supply at all, which lets you choose your own. If you've added a lot of new components to your PC, you may be overtaxing your existing power supply, so look at getting a bigger, better one. Power supplies can cause problems--including random crashes or even component failure--if they are asked to produce more power than they are designed to generate. Reputable manufacturers will typically include a chart of acceptable components.
Although many PC cases are sold with a pre-installed power supply, check it carefully - your power requirements may exceed the capacity of the pre-installed unit. How do you know? Here's a quick guide:
Component Wattage Required
Motherboard => 15-30
Low-End CPU => 20-50
Mid To High-End CPU => 40-100
RAM => 7 per 128MB
PCI Add-In Card => 5
Low To Mid-Range Graphics => 20-60
High-End Graphics => 60-100
IDE Hard Drive => 10-30
Optical Drives => 10-25
You may need to purchase a higher-output power supply for your new PC. And remember the air flow, your power supply provides much of the system ventilation and cooling!
Source: http://static.tigerdirect.ca/html/PCbuildingTips.html
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