How reliable is this power supply in terms of performance, and does it have any built-in features for over-voltage protection?

The power supply includes built-in over voltage protection, as well as over current and short circuit protection features.

What are the dimensions of this ATX power supply, and will it fit into a standard ATX case?

The dimensions of the ATX power supply are 5.9" Height x 3.4" Width x 4" Depth.

Questions & Answers: 420W 420 Watt ATX Power Supply Replacement for HP Compaq 0950-2800, 0950-3426, 0950-3623, 0950-3751, 0950-3961, 0950-410

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420W 420 Watt ATX Power Supply Replacement for HP Compaq 0950-2800, 0950-3426, 0950-3623, 0950-3751, 0950-3961, 0950-410

Replaces Several Older Legacy Power Supply; Upgrade to 420 Watts
Built-in 20+4 Pin Adapter: Supports 24 and 20 Pin Power Supplies
Reduced Depth for Increased Compatibility; 5.9" Height x 3.4" Weidth x 4" Depth
Over Current and Over Power Protection; Over Voltage and Short Circuit Protection
110-260V AC Switchable Power Supply

$79^.98 –