Im looking to upgrade my dell e521 power supply. I know that it is 305 watts but is it atx and what does atx mean. if not then what type is it...thanks
E521 uses BTX form factor and mobo. This means the layout is reversed. Also means the PCI-E slot is laid out differently from ATX cases. Dell's PSUs are mean wattage rated. The E521 comes with 305 mean wattage. Mean also means that if you're lucky your PSU could max higher than others. Otherwise, don't expect your PSU to reach more than 10-15% of max power. So if you want to upgrade your Video card for gaming purposes, they should require a minimum of 350 Watts (PNY and BFG have 7900GS series that only require 350W). Having said that, the amp and Volt rails are also (if not more) important. The stock E521 305 Watts PSU comes is rated 22Amps, 12Volt rails. Its stated on the PSU box itself. If you plan to upgrade your PSU in an E521, you need to consider that all devices in the box uses SATA connections. Also the Harddrive is located at the bottom opposite end of the PSU so SATA cable length is important to reach this device. You might end up having to move the HD up below the optical drive bay at the top to connect the cables. But if you ordered 2 optical drives and a media card reader/floppy drive, then you've run out of space at the top for the harddrive. If you plan to upgrade the PSU, do more research to know what you are up against.
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