Testing (continued):
The first set of charts takes a look at the three power supplies over a thirty minute period while the system was run from the idle to the load condition described. The chart indicates that a total of sixteen readings were taken at two minute intervals, with the first two readings being at idle, and the next fourteen being at load. The times are approximate, as I would not take load readings if 3DMark was transitioning between load tests, and because I could only read one rail at a time. For example, I would connect to the 12V rail - wait for it to stabilize - take a reading, and then repeat the process on the 5V and 3.3V rail, making sure to get back to the 12V rail in about two minutes. The transition between graphics tests was generally just over a minute, and really didn't delay any readings by much.
Let's start by looking at the 12V rail. The BFG Tech LS-680 12V rail started at 12.21V while at idle and hit a maximum of 12.30V under load. While the BFG Tech's deviation from idle to load of 0.74% is higher than was seen on the Rosewill unit, it is still very small and the values are much closer to specification. No complaints here.
On the 5V rail the readings for the BFG Tech unit are the only ones that don't dip below 5V at any time. The 5V rail started at 5.07V while at idle and hit a minimum of 5.02V under load, for a deviation of about 0.99%. Not only is the value closest to specification, the regulation is also the tightest of the three units tested. Very nice!
The 3.3V rail on the BFG Tech unit was more dynamic than the Rosewill unit, but again the values were closer to specification. The 3.3V rail started at 3.32V while at idle and hit a maximum of 3.36V under load, for a deviation of 1.20%.
All three values were very close to specification, and the regulation on each line was quite acceptable. The data may look more interesting in these charts given the small scale used, but the changes from idle to load were trivial in any case.
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