350W is rated maximum usage

I bought kill-a-watt from a LYN seller (costs RM 90) , so I decided to plug in on my main PC (as seen in spec) and my macbook pro

Main PC (650W PSU)
Plugged in n turned off (Wake On Lan Turned On) = 2W
Plugged in n turned off (wake on lan turned off/ERP) = 0.1W , nearly 0W
Windows is booting up = 250W
Idle in Desktop = 195W-220W
Playing Games/Rendering/Serious CPU usage = 300-380W
Standby = 4W

Laptop (85W adapter)
Plugged In and PC is sleep/turned off = 0.0W (Fully Charged)
Plugged in and PC is sleep/trned off = 25W (Charging)
Idle in Desktop = 30W (fully charged)
Idle in Desktop = 50-68W (charging)

There you go , those are some rough estimates. Will try to measure my LCD TV later to know about its power consumption as well. If you are really paranoid about how many Watts is your device is using and stuff , get kill-a-watt , pretty nifty device