Can a 300 watt graphics card run on a 240 watt pc? Will this affect my pc's performance?

Solution
In a build a couple years ago, I forgot to plug the 6-pin power into the Nvidia GPU (thus limiting it to the 75 Watts it could pull from the PCIe slot). Everything ran just fine - no blue screens or crashes or stutters. Just the performance of the GPU in games was a lot lower than what it should've been.

So it'll probably work, but it defeats the purpose of buying a GPU that needs that much power. If you've already ordered a more powerful PSU and are just itching to use your system before it arrives, then yeah you can probably do it. But long-term you need to match it to an appropriate PSU.

Also bear in mind that the max wattage rating of PSUs is more of a "burst" wattage. They're not designed to operate continuously producing...
Yes. By using a 300 watt graphics card on a 240 watt power supply may result in system not booting up. And if luckily it boots up , then it will lag a lot. You will surely notice difference .I recommend you buying a power supply greater or equal to 300 watt.
 


NOOO. I am using a low profile card on 500 watt PSU . Also for your knowledge, the components pull energy, which is required by them, because it is watt. The risk is only of voltage, which is only 12 V .
 
In a build a couple years ago, I forgot to plug the 6-pin power into the Nvidia GPU (thus limiting it to the 75 Watts it could pull from the PCIe slot). Everything ran just fine - no blue screens or crashes or stutters. Just the performance of the GPU in games was a lot lower than what it should've been.

So it'll probably work, but it defeats the purpose of buying a GPU that needs that much power. If you've already ordered a more powerful PSU and are just itching to use your system before it arrives, then yeah you can probably do it. But long-term you need to match it to an appropriate PSU.

Also bear in mind that the max wattage rating of PSUs is more of a "burst" wattage. They're not designed to operate continuously producing 100% of their rated wattage. For sustained use, try to to get a PSU which produces the wattage of your system at load at 80% of the PSU's rated capacity. (Going the other way - too much PSU wattage - is not bad for your equipment. But PSU efficiency starts to nosedive below 50% load, so you're wasting electricity if you get a PSU with too high wattage.)
 
Solution


You are not making any sense. I am well aware of how a computer and it's power supply works, you seem to be the confused party here.
 


a psu does not ram in 500W of power to a cpu!
 

AGREE. THIS IS WHAT I WAS TRYING TO SAY, BUT COULDN'T EXPRESS MYSELF....