Your measurment of the +5 is usually wrong. Sometimes its right, but usually its not. But with a 250Watt PSU running the stuff you have it may be low. Just run what you need and don't let it keep dropping and you should be alright. Here is some info. so you can say you were informed from my post at least
Okay, different things run at different wattages. These wattage ratings are your STARTUP wattages. Your startup wattages are usually much more than your RUNNING wattages. Sometimes up to 4 times. Just a little clue as to what you MAY be running.
AGP Slot 35 watts
AGP PRO Slot 50 watts
PCI Slot 35 watts
Intel series of CPUs 40 watts
AMD series of CPUS about 50 watts
*Note: AMD CPUs, the Athlon and the Duron, they require a +5V/ 1amp stand by from your PSU to work properly.
Different motherboards require different power requirements. Some chipsets are more, some are less.
Single CPU boards 25 – 40 watts
Dual CPU boards 35 – 50 watts
1 watt per 32mb of ram
CD-ROM 15 watts
CD-R 30 watts
CD-RW 30 watts
DVD-ROM 15 watts
DVD-RAM 30 watts
Floppy drive 2 watts
Usually draw somewhere around the neighborhood of 1.5 to 2 average. Some are more.
Network cards 10 watts average (variable)
SB Live 20 watts
SB Audigy about 30watts
These are STARTUP wattage ratings. Your RUNNING ratings should be about half of this.
Good luck and sorry for the long post.