Be aware that cheap Chinese power bricks can be very low quality and have badly regulated outputs. If you use a compatible rather than the manufacturers own replacement, make sure it's a reputable make from a reputable place - otherwise you might store up problems for the future.
1. The physical size of your PSU, some are hard to replace due to being a non standard size. 2. The amount of power need from the PSU don't skimp. 3 The correct connections for your equipment
1. Physical Dimensions
Besides the specs and form factors, the physical dimensions are also important factors in selecting a compatible power supply. Here is an outline of the physical dimensions of most standard power supplies:
# ATX: 6x3.5x5.5", HxWxD. Most common. Uses 4 mounting screws. # Mini-ATX: 5x3.5x5", HxWxD. Rare size. Uses 4 mounting screws. Can be used in a regular ATX case, but often not the other way around. # MicroATX: 5x3x4", HxWxD. Use 3 mounting screws. Not interchangeable with ATX or miniATX. # Flex ATX: Even smaller than Micro ATX. Various sizes according to case specs; often not interchangeable.
Use the data above to determine if a particular power supply would fit your case.
The quality of a power supply can be estimated by its weight. While this is not a true scientific or thorough measurement of the power supply reliability, it is nevertheless a very simple and easy way for ordinary PC users to estimate and compare the quality of a power supply. Why weight matters click here
3. Correct connections Some boards have 20 pin connectors others 24 pin There is often a 4 pin plug required to power Intel CPUs Molex D plugs for IDE HDD and CD/DVD drives SATA power connections for latest HDDs and DVD drives.
Thanks for all your efforts! 'wants a laptop psu, not an atx one!' Infact I was considering a 12v car/mains psu, but just recieved an email from Maplins and their range is not compatible. I saw a Trust (12v only) the other day, any opinions on them?