http://www.circotech.com/bestec-atx-250-12z-rev-d7r-replacement-power-supply-250w-hp-part-number-5188-2622.html
will this work out the size isnt that different and im getting it cheaper than that price
Both the PSU's are ATX. So physically I don't think there will be an issue.
I would recommend you to buy a Cooler Master or a Corsair PSU. They are 80+ certified and will run better.
PSU is like the backbone of your system. If it fails, it can make many more components go faulty. So in saving money for a cheap PSU, you might end up paying lots to get other parts like RAM and GPU repaired/replaced.
It might cost you $20 extra but its worth it.
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