Paul Miller64 said:hmm, I used to run an 8800 GTS with just 320MB and it worked fine....
Alright, let me put this another way: brands like those budget off-brand units you see at big-box retailers—think generic power supplies from a local discount shop—are basically bottom-tier components. They suffer from a few major issues: a) they don't actually deliver much juice on the 12V rail;
b) they aren't built with any decent internal components;
c) they lack basic protection against sudden voltage spikes;
and so on.
Sure, you might be able to get a beefier graphics card running on one of them for a while, but once you start pushing it with high power demands, things can go south pretty fast. And because of that cheap construction, if it does blow, there’s a very good chance it’ll take something else down with it—be it your GPU, your motherboard, your hard drive, or even the whole system...
The bottom line is that you should look to replace that power supply as soon as possible. Personally, I'd much rather have a rock-solid, high-quality power supply paired with a weaker graphics card than the other way around.😉