Articles: Cases/PSU

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Thermaltake EVO Blue 550W and 750W

Although this review is supposed to cover 600W and higher PSUs, it wouldn’t be right to dismiss the 550W EVO Blue. It is just very similar to its 750W cousin.

Both are shipped in identical large boxes. The only difference is the paper belt where the wattage rating of the specific model is indicated.

You can learn specifications of the different models of the series on the back of the box. The text in several languages confirms that there is indeed a power supply, rather than something else, inside the box.

The accessories in the box include a vibration-absorbing silicone pad the PSU can be installed on. The EVO Blue series isn’t new, yet can still be found selling in shops, so you may be interested in learning how it performs.

Exterior Design

If you are bored with conventionally designed PSUs whose only difference from others is a sticker with the manufacturer’s name, Thermaltake’s EVO Blue series is going to be a nice diversion. The two models look the same (except for the wattage rating and specs) but both are highly original.

There is a lot of vent openings all over the PSU case, including the horizontal slits opposite the fan that we first saw with the ToughPower QFan 650 A. This solution is hardly efficient, though.

There is a vent grid even in the bottom panel of the case which is usually blank. It only serves a decorative purpose, though. Besides the effective appearance of the PSU at large, its fan has as many as five selectable highlighting modes you can switch through with the button on the back panel.

The highlighting can be blue, green or red. There are also two more modes that alternate between the available colors in different order. The highlighting can be turned off altogether. The modular connectors are highlighted as well, in constant blue.

So, Thermaltake’s EVO Blue series looks like a modder’s dream. Hopefully, the rest of its characteristics are going to be that spectacular, too.

Circuit Design

We’ve already noted some outward similarity between the EVO Blue series and the ToughPower QFan 650 A. The circuit design turns out to be similar, too.

The PSU is based on Channel Well’s PSH platform which is known to us by lots of other PSUs selling under various brands.

A PWM and PFC controller CM6800X resides on a separate card located near the middle of the main PCB.

We won’t describe the well-known platform once again. We can only remind you that it features dedicated voltage regulation based on electromagnetic amplifiers. Thermaltake’s implementation has Teapo capacitors at the output.

Cables and Connectors

The EVO Blue 550W is equipped with the following cables and connectors:

  • One mainboard cable with a 20+4-pin connector (63 cm)
  • One connector for a CPU cable
  • Four connectors for graphics card cables
  • Four connectors for peripheral power cables

Included with the PSU are:

  • One CPU cable with 8- and 4-pin connectors (65+15 cm)
  • Two graphics card cables with 6-pin connectors (50 cm)
  • One graphics card cable with one 8-pin connector (50 cm)
  • One cable with three PATA power connectors and one floppy-drive plug (50+15+15+15 cm)
  • One cable with three PATA power connectors (50+15+15 cm)
  • Two cables with two SATA power connectors on each (50+15 cm)
  • 8->6-pin adaptor for graphics cards (15 cm)

The EVO Blue 750W model has a third connector on each SATA cable. It also comes with a second graphics card cable with an 8-pin connector and an 8->6-pin adaptor for it.

We like the cables of these PSUs. Those of them that should be long (the mainboard and CPU ones) are indeed long whereas the rest of the cables are just the right size (too long peripheral cables may be unhandy).

On the other hand, we can see one problem about the cables. The number of SATA connectors is too small for a 550-watt PSU. It is almost impossible to connect more than two HDDs together with an optical drive. Why not include two SATA cables with three connectors on each, as with the 750W model? The accessories to the 550W model are not so scanty, so why did they try to save on the cables?

Like with the Chieftec PSU, this may be due to unreasonable unification. For example, the number of the junior EVO Blue model’s connectors for graphics card cables does not match the number of included cables (this solution can be explained by the rather low wattage rating of this model, though).


Rather disappointingly, the declared 550 and 750 watts are just the peak output power whereas the continuous one is 50 watts lower for each model. The load capacity of the junior model’s +12V rail is not very high: up to 432 watts or 86.4% of full output power. The +3.3V and +5V rails can deliver 140 watts, which is more than enough for any modern computer.

The senior model differs in the load capacity of its +12V rail which is 20 amperes higher. Thus, it can deliver 672 out of its full 700 watts across the +12V rail. This is high enough (96%) for a modern PSU.

The EVO Blue series is not 80+ certified but Thermaltake claims them to be 78% or more efficient with 115V mains and 80% and more efficient with 230V mains.

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