I recently Bought a Radeon HD 4450 as a temporary card to at least.. do things.

But the problem is, It says a minimum requirement of 400 WATT power supply.
Im not so sure if mine is 300 or 350. But I was wondering, if I do connect it, will there be any damage to anything? I was told either the powersupply will blow, or it just wouldnt turn on.

I also saw a much more powerfull card that requires 400 watts also... so im guessing.. 400 watts requirement on this card .. maybe 350 would do it? idk.. ill be more detailed later gotta go for now

If a power supply if underpowered, the voltages it supplies can be unstable - and this is bad for your computer. When stressed PSUs fail, you HOPE they just shut down, and most do. But remember, power supplies plug into the wall, so there is the potential for catastrophic damage if they fail so it is not worth the risk.

Use the eXtreme PSU Calculator Lite to determine your power supply unit (PSU) requirements. Plug in all the hardware you think you might have in 2 or 3 years (extra drives, bigger or 2nd video card, more RAM, etc.). Be sure to read and heed the notes at the bottom of the page. I recommend setting Capacitor Aging to 30%, and if you participate in distributive computing projects (e.g. BOINC or Folding@Home), I recommend setting TDP to 100%. Research your video card and pay particular attention to the power supply requirements for your card listed on your video card maker's website. If not listed, check a comparable card (same graphics engine and RAM) from a different maker. The key specifications, in order of importance are:

1. Current (amperage or amps) on the +12V rail,
2. Efficiency,
3. Total wattage.

Then look for power supply brands listed under the "Good" column of PC Mechanic's PSU Reference List. Ensure the supplied amperage on the +12V rails of your chosen PSU meets the requirements of your video card. Don't try to save a few dollars by getting a cheap supply. Digital electronics, including CPUs, RAM, and today's advanced graphics cards, need clean, stable power. A good, well chosen supply will provide years of service and upgrade wiggle room. I strongly recommend you pick a supply with an efficiency rating equal to, or greater than 80%. Look for the 80 Plus - EnergyStar Compliant label. And don't forget to budget for a good UPS with AVR (automatic voltage regulation).

Thanks, this helped alot.

Basically from what ive seen, I shouldn't addon anything else into the pc, till i get a new psu.

"Invest" in a good one.

Originally Posted by Digerati

"Invest" in a good one.

Yep. Right now, it is actually running it, and ive had no problems so far.
I do too many risky tests/things. But its always too fun.

But yeah, A good power supply, + budget heatsink and im done.... no more of this torture, no more laptop fans.

Then I can start fresh with all my acquired knowledge from D-A-L.
And Build the PC that Ive always wanted.

+ budget heatsink and im done....

Not too budget - and if your CPU comes with a HSF assembly as part of the retail package, use it - they work, are pretty quiet, and will not void your warranty.

Originally Posted by Digerati

Not too budget - and if your CPU comes with a HSF assembly as part of the retail package, use it - they work, are pretty quiet, and will not void your warranty.

Well, I bought the CPU off some guy, So.. theres no warranty box or stuff.
Also yeah, I learned my lesson THE hard way getting Extreme budget