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MSI say here 300W but be aware that not just some el cheapo PSU can be used, some PSUs labelled as 300W can only produce something like 180W.

Stick with a proven brand and you will be fine.
 
HP do not use good quality PSUs and they are in fact one of the companies that are guilty of using junk PSUs that can`t produce what is stated on the label.

Take the side off your case and check the information label on the PSU, the brand could be Delta and the Max output stated as either 180 or 260W, the Max output is the true figure and the combined figure of 300W is a play on words as it is only the power on the +12V rail that gets measured and not the figures on the +3.3 and +5V rails which btw are both fed from the same +12V rail that provides the Max output figure.
 
HP do not use good quality PSUs and they are in fact one of the companies that are guilty of using junk PSUs that can`t produce what is stated on the label.

Take the side off your case and check the information label on the PSU, the brand could be Delta and the Max output stated as either 180 or 260W, the Max output is the true figure and the combined figure of 300W is a play on words as it is only the power on the +12V rail that gets measured and not the figures on the +3.3 and +5V rails which btw are both fed from the same +12V rail that provides the Max output figure.

is this relaible?
 
Read again my reply #4 as it tells you all that you need to know about that PSU.

HP do not use good quality PSUs and they are in fact one of the companies that are guilty of using junk PSUs that can`t produce what is stated on the label.

Take the side off your case and check the information label on the PSU, the brand could be Delta and the Max output stated as either 180 or 260W, the Max output is the true figure and the combined figure of 300W is a play on words as it is only the power on the +12V rail that gets measured and not the figures on the +3.3 and +5V rails which btw are both fed from the same +12V rail that provides the Max output figure.

The above post before we had your pic which confirms a max output of 260W which is no good for your intended GPU.
 
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