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In English
Suomeksi
Specifications & what is insideAccording to Spire, the SP-600W complies with following power supply standards: BTX 1.0a, ATX 2.01 and ATX 12V power supply design guide 1.3. Specifications are somewhat deficient; There is no specifications about ripples or operating environment. I think Spire is the only computer power supply manufacturer who tells the real life efficiency for their PSU, but why didn't they also tell the true power factor. In the specifications they only state that the SP-600W has active power factor correction. In my opinion the active PFC should be required in all the computer power supplies. The SP-600W is of course RoHS compliant, because Spire is marketing their power supplies in the EU. RoHS means that no lead or other hazardous materials are used in the product. In the early days of leadless soldering, there were cases when parts started falling from the circuit board after a while, but I really hope these issues are a thing of the past. |
Tests
We didn't test the power supply at maximum loads at all this time, because it's difficult with currents like 36 amperes and wouldn't really change the results noticeably.
| Voltage (V) | 3.3 | 5 | 12 | -5 V | -12 V | 5 Vsb |
| Max. current (A) | 26 | 36 | 29 | 0.5 | 0.8 | 2.5 |
| Min. current (mA) | 300 | 500 | 100 | 0 | 0 | 0 |
| Regulation | +-1% | +-1% | +-1% | +-1% | +-2% | +-1% |
| Measured regulation @ min load | 4.42% | 4% | 3.30% | 0.20% | -1.17% | 2% |
| Measured regulation @ higher load | 2.42% | 3.2% | 0.67% | 0.8% | -1.33% | 0% |
| Specified ripple* (mV) | 50 | 50 | 120 | 50 | 50 | 50 |
| Measured ripple @ max load (mV) | 140 | 80 | 100 | 335 | 300 | 120 |
| Measured ripple @ min load (mV) | 72 | 70 | 50 | 110 | 70 | 34 |
| Test load @ min load (ohm) | 10 | 10 | 8.2 | - | - | - |
| Test load @ higher load (ohm) | 1.2 | 0.4 | 3.3 | 10 | 15 | 2.4 |
| Max load (W) | 85.6 | 180 | 348 | 2.5 | 9.6 | 12.5 |
| Actual test load per line (W) | 9.52 | 66.564 | 8 | 2.5 | 9.6 | 10.42 |
| Total specified maximum load (W) | 650W | |||||
| Total test load (W) | 107W | |||||
* Manufacturer doesn't specify ripples but Spire claims that the SP-600W complies with the ATX version 2.01.
When you look at the table like this, you shouldn't pay too much attention to the voltage of the lines because it doesn't matter that much. There's no problem as long as the voltage stays within +-5 percent from the nominal. With PC-hardware, much more important values are the ripple voltages. Ripple is what you hear from your headphones or loudspeakers with poor a sound card and maybe even with good one if you have a miserable power supply.
So the SP-600W definitely doesn't comply with any of those power supply standards, because there is too high ripple even at such a low load. At minimum load two rails stayed specifications: 12 V and 5 Vsb. At higher load the 12 Volt line was the only one to stay in the specs.
Ripple is the small, high frequency jumping of the voltage that's left after the output filtering the output lines and generally manufactures try to save on the amount of filtering and in the quality of the components used. Low-Pass filter is usually made from a choke coil and a capacitor and by increasing their values the filtering gets better. At the same time the components get bigger and more expensive. That's why it's tempting to stay in small values and small components when trying to make more profit with the products.
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