Articles: Cases/PSU

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Chieftec SPS-650C

The previous 600W model was the highest-wattage PSU in the A80 series but the SPS-650C with its wattage rating of 650 watts is the junior model in the Nitro 88+ series which goes all the way up to 1000 watts.


The product’s box is larger in every dimension than the packaging of its entry-level cousin and has a carry handle. We can spot an 80 PLUS Silver certification badge on the front of the box.

The PSU and mains cord are packed into individual velvet pouches. There is no pouch for unused detachable cables, though. Like with the above-discussed A80 series model, the user manual covers two PSU series from Chieftec: Nitro 85+ and Nitro 88+.

Exterior Design

Although there’s nothing special about this PSU’s design, its coloring is surely eye-catching. The panels of the case are rather thick. The cover of the case is secured with more screws than usual.

We can see four vent slits in one of the side panels. There’s an On/Off switch on the back panel.

Circuit Design

The interior design of this product helps us name its actual maker as Channel Well, although there are some differences from Channel Well platforms we’ve tested.

Comparing this interior to that of the Chieftec BPS-650C (the CWT PSH II platform), we can see they are similar in their component layout, yet also differ in many respects.

The dedicated voltage regulation is now based on DC-DC converters instead of magnetic amplifiers. Some of output electrolytic capacitors have been replaced with solid-state ones. A choke has been added into the filtering circuitry while the heatsinks have become more complex.

All of this must have been meant to make the PSU more efficient to meet the 80 PLUS Silver requirements because the BPS-650C model was only Bronze-certified.


As for controller chips, the PS229 supervisor is the same as in the BPS-650C. The PWM & PFC controller is now represented by a CM6802TAHX chip instead of a CM6800G.

There are electrolytic capacitors from United Chemi-Con at the PSU’s output. They enjoy an excellent reputation.

Cables and Connectors

The Chieftec SPS-650C is equipped with the following cables and connectors:

  • Mainboard cable with a 20+4-pin connector (62 cm)
  • Two CPU cables with 4+4-pin connectors (63 cm)
  • Four connectors for graphics cards
  • Four connectors for peripheral devices

Included with the PSU are:

  • Two graphics card cables with one 6+2-pin connector on each (60 cm)
  • One cable with two PATA power connectors and a floppy-drive plug (60+14+14 cm)
  • One cable with two PATA power connectors (60+15 cm)
  • Two cables with three SATA power connectors on each (60+15+15 cm)

The cables are almost the same as those of the BPS-650C model (with the addition of a second CPU cable) but somewhat longer. So, we can again complain that there are only two graphics card cables included into the box although the PSU has four connectors for them. The Chieftec SPS-650C is quite capable of powering up a couple of performance-mainstream graphics cards with two power connectors each linked in a SLI or CrossFireX configuration, but you’ll have to use adapters for it due to the lack of cables.


The Chieftec SPS-650C differs from the BPS-650 model we tested earlier in the load capacity of the +12V rail which is 12 watts lower. Overall, the specifications are up to today’s standards.

The PSU itself and its box bear the 80 PLUS Silver badge but are not listed among officially certified products. Moreover, there are no Chieftec PSUs at all with Silver certification.

The Chieftec SPS-650C has been selling for over a year already, so this can hardly be due to the official 80 PLUS website being slow to update. It is also doubtful that Chieftec would use the certification badge without any reason (Chieftec does put self-made certificate badges on its products from time to time but they do not copy the official 80 PLUS badge).

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