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Graphics Card power supply question

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Hello and thanks in advance for your the help!!!

I have an HP Workstation XW4100 that has a 280 watt power supply. I want to upgrade the graphics card but the lowest I can find is one that says it requires 300 watts. I've looked at a lot of graphics cards and some of them say something like this:

300 watt or greater power supply (recommended)

I'm curious about this "recommended". Does that mean a 300 watt graphics card will run on a 280 watt power supply?

I actually bought a 350 watt power supply but it appears to be the wrong size for my pc. It is slightly smaller than the one I have and the screw holes don't line up. Do I have to buy the same brand power supply for it to fit? Also, can I just up the power supply on my computer without frying it? I'm a bit of a novice so sorry if my questions seem a bit rudimentary.

Here is what I have:

Hipro 280 watt

Here is what I bought:

JeanTech 350 Watt
NVIDIA GeForce 7 (7300T)

Thanks very very much!
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Having too much power will not fry your computer its just that some of it will be unused. Also it is very likely that we don't know the model and make of the PSU and so it is almost impossible to find the exact one with more power. However you can find a case pretty cheap these days, or if it was me I'd just find a way to mount it down myself, the hard way is the fun way, lol. Also I'm not sure if that card will be compatible are you sure your computer has a PCI-E slot?

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