Power Supply question for my computer

Well, I am going to be replacing my video card in my computer with a ATI Radeon HD 4670 (I know it isn't the most top of the line card but I am gaming on a reasonable budget). I have a HP Amd Phenom II Quad-core 2.6ghz computer and I have been told that HP computers usually need a new power supply to use a new video card because the ones they come with are weak. Will I need a new power supply for this card? If so how powerful?

whats the wattage on your current psu

Is there any way for me to figure this out without opening the computer? The futureshop website that I bought it off says "Information Not Available". Although the customer reviews seem to all mention the power supply being weak.

EDIT: Would a 450 watts power supply be good for the video card and such?

450? Hmm, I personally think you can't go by wattage alone, however; it does seem like you may need a more powerful power supply to keep your rig running smoothly and to remain stable.

I'm curious as to why you wouldn't want to open up the computer to check your current psu but you're wanting to replace the video card which will require opening the case and most-likely, as you've been told, need a psu larger than the one in the case.Stinger78

I am quite aware that a video card requires opening it but I hate opening computers and this computer is new and I just don't want to open it until I need to. Especially because I am almost sure I will need a new power supply.

corsair has a calculator that might help

http://www.corsair.com/psufinder/default.aspx

450? Hmm, I personally think you can't go by wattage alone, however; it does seem like you may need a more powerful power supply to keep your rig running smoothly and to remain stable.

_Matt_

I'm probably going to get a BFG 450 Watts Pc Power Supply, that is the cheapiest one I can find that isn't a Dynex (which apparently aren't very well made).

I'm probably going to get a BFG 450 Watts Pc Power Supply, that is the cheapiest one I can find that isn't a Dynex (which apparently aren't very well made).

BrickMcStick

I rather you get a hd 5670, than a Psu that will turn the inside of your rig into country-fried steak.

openning ur computer is the cheapest way to find out

[QUOTE="BrickMcStick"]

I'm probably going to get a BFG 450 Watts Pc Power Supply, that is the cheapiest one I can find that isn't a Dynex (which apparently aren't very well made).

Bikouchu35

I rather you get a hd 5670, than a Psu that will turn the inside of your rig into country-fried steak.

What does my video card have to do with my psu frying my computer? I have read some reviews of the power supply and I don't see any problems with it.

[QUOTE="_Matt_"]

450? Hmm, I personally think you can't go by wattage alone, however; it does seem like you may need a more powerful power supply to keep your rig running smoothly and to remain stable.

Too_tight_shoes

Hmm, that surprises me. I guess ATI is more power-efficient than Nvidia then. My GPU requires a 500w minimum, and my new one is going to require a 600w minimum.

My current power supply is 300w. I don't trust running my new card off of that so I will get that BFG 450 watts power supply.

I guess ATI is more power-efficient than Nvidia then.

_Matt_

[QUOTE="_Matt_"]I guess ATI is more power-efficient than Nvidia then.

swehunt

Haha, thats quite impressive. You gotta love AMD.