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Cabling: Since cabling is now an important selling point, I've decided to include it as a major topic. Call me unscientific, but I get more worked up over shoddy cabling than I do over how many and what type of capacitors the unit has. Perhaps this comes from my personal history of spending hours meticulously going over routing of cables and fan harnesses. Suffice it to say that it is important to me when evaluating the overall quality of the unit, since haphazard wiring usually extends to other aspects of construction.
This is not the first modular power supply I have reviewed, so I'm not that easily impressed. However, a few things stand out with the Sintek unit that I haven't seen before. First off, there are two distinct types of modular connectors: Those that exit the chassis as stubs with connectors spliced in, and those that are arranged in an integrated bank. I favor the integrated bank, like the Sintek has. It is just neater and more professional-looking.
The jacks are solid and connections are
positive. However, there is one aspect that I don't like: The jacks
are all the same, and are not keyed to prevent incorrect hook-ups. There
is a big warning sticker applied to the back of the unit that tells you in plain
text that you better not hook up your hard drives to the PCI-E connectors, or
the world will come to an end.
Melodrama aside, many years of case building has taught me at least one thing: If you leave the door open to Murphy, he will step in sooner or later. My advice to Sintek: "Don't put a sticker on it, prevent it with keyed connectors. It may save money to use the same connector on everything, but it is much better to prevent the possibility of an incorrect attachment, especially when expensive components may be damaged."
Specifications The specifications of the power supply are spelled out in detail in the included manual. The manual itself is thorough, complete, and covers all the pertinent electrical properties. I've been criticized in the past for not including every electrical property of power supplies that I review, but realize that I am not (and have never claimed to be) an Electrical Engineer.
However, I know that many VH readers are interested in the nitty-gritty details. In order to satisfy the hunger of those of you who demand it, I will provide the basics and my impression of the unit, and then if you are still left wanting, I will refer you to the manufacturer's online documentation for the rest. Despite some glorified testing on the Sintek website, I don't believe that increasing the voltage output of your power supply will directly result in increased performance, but I do believe that in a bleeding edge system, under-voltages will result in system instability. The ability to adjust the output of the PCI-E and memory rails is noteworthy, +/- 5% being the advertised range. There is a small (undocumented) mark on the dials to indicate default positions. Your individual motherboard software utility will be your best guide to maintaining the proper voltages here. As with most power supplies, the most pertinent information can be found on the chassis label. What is interesting to note when reviewing these power supplies is not the maximum amperage per rail, but the maximum combined wattage the unit is capable of sustaining. You can find the maximum wattage per rail by multiplying the amperage times the voltage. For example, for this 500W unit, the label says that the power supply will sustain 30 Amps on the 3.3V rail. If you multiply this you get 99 Watts. Now, if you go to the 5V rail, you can multiply 5 x 30 and get 150 Watts. No problem. However, a keen observer will note that the combined wattage of the 3.3V and 5V rails put together is only 180 Watts, not the anticipated 249 Watts. In a similar manner, the combined output of all the various rails put together is only(!) 500 Watts, not the sum of the individual rails put together. This is something that bears careful consideration if your system is heavy on one particular rail. As you can see by making comparisons of the 500W and 600W specs on this label, the "extra" 100 Watts is spread between the total power, and only the 5V rail gets an extra 10 Amps of current capacity. All other rails remain the same. In reality, you are really only getting an extra 20 watts of combined power on the 3.3V and 5V rails. Something to think about when comparing supplies. My main criteria for testing power supplies is whether the system they are installed in remains stable under varying load conditions for an extended duration. As a precaution, prior to installation the unit was tested using my FrozenCPU power supply tester, and all rails reported voltages normal. Two weeks of constant use (24-7 operation, varying loads in a new system) and no reported problems so far. As always, if things go south, I will report back to the editor with an update.
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