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Akasa Powerplus AK-P650FF BK

First up is one of two monster 650W power supplies, which, to be frank, is a complete waste of money if you’ve got a standard PC. Sure, if you’ve got a high-end graphics workstation, then this might be what you need to power your dual Opteron processors with dual Quadro FX 4500 cards. However, even with dual 512MB GeForce 6800 Ultra cards and the most power hungry CPU you can find and four hard drives in a RAID this is overkill.

But there will still be people out there buying 650W PSUs to be on the safe side. The Akasa Powerplus AK-P650FF BK – BK for black – is quite a lot larger than a normal ATX PSU due to its server pedigree. Akasa actually admits that the Powerplus range was “designed as hi-performance server class PSUs”. The reason behind this is because it uses four 12V rails compared to two 12V rails of a standard ATX PSU.

Instinctively you’d think that four is better than two, but this is not always the case as it’s very dependant on the rating of each power rail. The 12V rails are rated at 13, 18, 16 and eight Ampere respectively, which means that only the 18A rail can handle a high load. The 13A rail powers the main CPU – as this PSU has been designed for dual CPU systems – and there should be more than enough power here for a processor. Akasa has been clever here though as the 18A rail powers the +12V connector as well as any SATA devices and the three Molex connectors marked as AUX. The 16A rail powers the motherboard and the PCI Express graphics card connectors as well as an adaptor that is used for new Super Micro motherboards. Finally the 8A rail powers the remaining Molex and floppy connectors.

There is only a single 80mm fan fitted, and although it is a high quality Sanyo Denki ball bearing fan, it’s spinning at a very high speed in order to provide enough airflow through the PSU. The problem here is that even at very light loads the AK-P650FF is far from quiet and during full load it sounded like a small aeroplane. However, as this is a 650W PSU you’re not ever like to be able to load it up to 650W in a normal PC. A different cooling solution would’ve solved this problem.

Where Akasa scores a few bonus points is in the connectivity department, as there are no less than nine Molex connectors, two floppy connectors, four SATA connectors and two PCI Express graphics card connectors. There is of course an ATX connector with an additional four pins that can be clipped on for a 24-pin style connector and an eight-pin 12V connector with a four-pin adaptor. All the cables are of a good length so there shouldn’t be any problem using this PSU in a full tower case. You also get a power splitter in the box for powering two three-pin fans.

Moving on to the test results the AK-P650FF didn’t excel in any way, but this was hardly expected of a monster PSU such as this. It performed pretty much as expected although the efficiency at 100 per cent load could have been better. The reason behind the drop is because Akasa has over-rated the AK-P650FF slight, at least if you compare it with the SilverStone which is virtually the same PSU with a few modifications.

On the bright side, the AK-P650FF passed all the tests with flying colours. It also passed the Hi-POT test at 1.5kV as well as the stress test without any problems.

Finally there is the matter of parting with your cash. At £91.65 the Akasa doesn’t come cheap, but as a workstation or server PSU this is not terribly expensive. However, for a home PC, there’s no doubt that this is overkill.


The Akasa Powerplus AK-P650FF BK is a true 650W server and workstation class PSU with plenty of connectivity options and will handle just about anything. But it’s over specified for a home PC and quite expensive.

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