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The following product(s) are recommended based on the information you provided for Bestec ATX-300-12Z. All items in the list are compatible replacements for Bestec ATX-300-12Z power supplies:

ATX-300-12ZCDR - $54.99
The Bestec ATX-300-12ZCDR 300 Watt atx power supply replaces many HP and Compaq models that require a 24 pin atx connector. In addition to its compatibility with nearly 100 computers in our database you'll find that this power supply is a high quality candidate for ordinary applications as well. This power supply is now discontinued from Bestec, if you order this model a compatible replacement will be sent out, it is part number AP-MPS3ATX40.
  • Weight: 3.3 lbs

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AP-MPS3ATX40 - $51.99
This Athena AP-MPS4ATX40 400 watt atx power supply takes up little space since it is only 4 inches deep. It is well known for its large amount of connectors which can been seen below the power supply in the picture. The fact that it has so many connectors makes this power supply extremely universal and compatible with lots of HP and Dell systems.
  • Weight: 3.0 lbs

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500WPS24 - $38.90
This 500 watt atx power supply performs with whisper quiet operation. The unique atx connector on this power supply allows you to use it for both 20 pin and 24 pin atx connector configurations. The built in 20 pin to 24 pin adapter for your atx connector comes in handy. This power supply fully supports P4 and AMD CPUs. Power supply pictured above does have one modification now: it has an on/off switch above the power plug source. It no longer has the AC output plug.
  • Weight: 2.6 lbs

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630WPS - $44.99

In the world of computer power supplies this is just about as good as it gets. With a hefty 630 watts of juice there is surely no computer too big to overload this baby. Inside the power supply is three 80mm cooling fans that operate in a hush-hush manner . On the outside of the power supply there are three nice looking chrome grills that cover the 80mm fans. The physical external power switch is handy for turning this power supply off when you want to disconnect power from the entire computer.In the world of computer power supplies this is just about as good as it gets. With a hefty 630 watts of juice there is surely no computer too big to overload this baby. Inside the power supply is three 80mm cooling fans that operate in a hush-hush manner . On the outside of the power supply there are three nice looking chrome grills that cover the 80mm fans. The physical external power switch is handy for turning this power supply off when you want to disconnect power from the entire computer.
  • Weight: 3.9 lbs

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Disclaimer: This power supply cross refence engine is for information purposes and reflects only the opinion of the author. The sole responsibility rests with the buyer when selecting a power supply for a computer.

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