On Figure 20 you can see Toughpower 750 W label stating all its power specs.
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Figure 20: Power supply label.
What immediately caught our eye were the four separated +12 V lines listed on the label (see Figure 20). As it happens to all high-power units nowadays, Thermaltake uses a “virtual rail” concept, where they label their power supplies as having separated +12 V rails but inside the unit they are all connected together to a single +12 V rail on the power supply printed circuit board. Unfortunately all manufacturers seem to be doing like this to match the ATX12V 2.x and EPS12V specifications, which require the power supply to have separated +12V rails.
The +12 V wires are separated into four groups, +12V1, +12V2, +12V3 and +12V4, see Figure 21. However, as we explained, they are all connected to the single +12 V power supply rail, as shown on Figure 22 (the red lines are jumpers, i.e. wires).
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Figure 21: +12 V wires are separated into four groups.
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Figure 22: But they are connected to the same +12 V line on the PCB.
From the previous page we came with some maximum theoretical numbers for the +12V output (1,440 W), +5 V (200 W), +3.3 V (132 W) and 5VSB (50 W).
As we mentioned earlier the maximum current/power each line can really deliver will depend on other components, especially the transformer, the coil, the capacitor and the wire gauge used.
One interesting thing about this power supply is that Thermaltake didn’t state the maximum power for each individual output on the power supply label, what is really unusual. For the +12 V output, for example, they stated 18 A for each one of the four virtual rails. This translates into 216 W per rail or 864 W total – more than the maximum labeled power for this power supply. This number is below the maximum current the +12 V rectifiers can deliver anyway.
For the + 5 V output Thermaltake stated a 28 A maximum current, which translates to 140 W, while for the +3.3 V output the manufacturer stated a 30 A maximum current, or 99 W. On the label, however, Thermaltake says that the combined power of +3.3 V and +5 V outputs is of 180 W (since they are connected to the same transformer output).
+5VSB output is labeled as having a 3 A maximum power, meaning 15 W.
All outputs are labeled with a current well below the maximum current each rectifier can deliver.
Unfortunately we don’t have the necessary equipment to make a true power supply review; we would need to create a real 750 W load to check if this power supply could deliver its labeled power or not.
