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Logisys 650W ATX12V/EPS12V Power Supply (PS650U12)
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Observation
Among the plugs coming out of the power supply:
One 20+4Pin BTX/EPS 12V
Two 6Pin PCI-Express
Four SATA Connectors
Six 4Pin Molex Connectors
One 8Pin ATX Connector
One 4Pin AUX Connector
Two Floppy Connectors
See below for an image from the Logisys web site that illustrates the different types of connectors.
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Connector types (actual connectors differ in appearance) |
A nice thing about the Molex connectors on this power supply is that there are plastic bulges on each side. To release a connection, squeeze these pieces of plastic and they'll help push away from the peripheral to which they are attached. It's the one type of connector that seems to be the hardest to disconnect and it's nice that Logisys thought of this ahead of time.
Testing
I installed and tested the Logisys PS650U12 on a system with the following load:
AMD Athlon64 3200+
Geforce 6800GS
1.5Gb DDR-400 RAM
Stock motherboard
Two optical drives
Two IDE hard drives
Miscellaneous other peripherals
I then used a digital multi-meter to test the 12V, 5V and 3.3V lines under this load and compared them to the ATX Specification standard for power supplies (+/- 5% tolerance for each of the lines above). The results are as follows:
| +12V | +5V | +3.3V | |
| Idle | 11.84V | 5.11V | 3.36-3.37V |
| Stress | 11.85-11.86V | 5.11-5.12V | Same as above |
| Shutdown | 11.86-11.88V | 5.10-5.11V | Same as above |
| Boot | 11.83-11.88V | 5.10-5.12V | Same as above |
Conclusion
The voltages measured are well within the acceptable range for power supplies. Also, just as important as being at a good voltage is being consistent at that voltage. As you can see via the table above, this power supply is extremely consistent at its operating voltages, with the only exception of the boot-up swing on the 12V line. Even so, however, the swing of 0.05V is acceptable, although any more of a swing would be cause for concern. This power supply should be stable in most systems.
A keyword that Logisys uses in the main part description is that it is "silent." I wouldn't call it loud as some customer reviews say, but I do hear it more clearly than I should a "silent" power supply. There are also numerous accounts of the power supply working, but simply not being compatible with some motherboards. I did not experience this in my testing, but it's enough of a concern to take me aback and feel compelled to mention it.
As they say, you get what you pay for. As far as power supplies of this wattage go, at $69.99 on Newegg, this is a very inexpensive power supply. While it's extremely important not to go too cheap on this crucial component, this product seems to be a good purchase if you're on a tight budget but want to make sure you're not jeopardizing your production system. Make sure not to throw the box and receipt away as soon as it comes in, though, just in case.