Manufacturer: Seasonic

Introduction and Features

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Seasonic is a well known and highly respected OEM that produces some of the best PC power supplies on the market today. In addition to supplying power supplies to many big-name companies who re-brand the units with their own name, Seasonic also sells a full line of power supplies under the Seasonic name. The new XM2-1250 is the latest addition to the X-Series and features an improved Hybrid Fan control circuit and upgraded copper conduction bars on the main PCB, which together increase efficiency and performance.

The new XM2-1250 is a second generation X-Series power supply that comes with fully modular cables and a 120mm Sanyo Denki cooling fan. It is designed to provide ultra-tight voltage regulation along with high efficiency (80 Plus Gold certified).

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Seasonic X-Series XM2-1250 Special Features

Ultra Tight Voltage Regulation Improved load voltage regulation keeps the voltage fluctuations on the 12V output within +2% and -0% (no negative tolerance), and on the 3.3V and 5V outputs between +1% and -1%, which (under 80 Plus load conditions) results in smooth and stable operation.

Seasonic Hybrid Silent Fan Control The industry first, advanced three-phased thermal control balances between silence and cooling. The Hybrid Silent Fan Control provides three operational stages: Fanless, Silent and Cooling Mode.  In addition, a selector switch is provided to allow for manual selection between the Seasonic S2FC (fan control without Fanless Mode) or S3FC (fan control including Fanless Mode).

Reduced Cooling Fan Hysteresis is achieved by a new fan control IC, which optimizes how frequently the fan switches on and off. At 25°C ambient temperature the fan turns on when the load rises above 30% (±5%) and turns off when the load drops below 20% % (±5%). Due to this lag in response the fan switches on and off less frequently, which reduces power loss in Fanless and Silent Mode.

Dual Copper Conduction Bars on the power supply PCB help reduce impedance and minimize voltage drop, which further improves efficiency and performance.

80Plus Gold The XM2-1250 power supply is certified in accordance to the 80PLUS organization's Gold standards, offering performance and energy savings with up to =90% efficiency and a true power factor of greater than 0.9 PF.

Full Modular Design (DC to DC) The Seasonic X-Series power supplies feature an integrated DC connector panel with onboard VRM (Voltage Regulator Module) that enables not only near perfect DC-to-DC conversion with reduction of current loss/impedance and increase of efficiency but also a fully modular DC cabling that enables maximum flexibility of integration and forward compatibility.

Seasonic XM2-1250 PSU Key Features:

•    High efficiency, 80Plus Gold certified
•    7-Year manufacturer's warranty worldwide
•    Fully Modular Cable design with flat ribbon-style cables
•    Seasonic DC Connector Panel with integrated VRMs
•    Hybrid Silent Fan Control (3 modes of operation: Fanless, Silent and Cooling)
•    High-quality Sanyo Denki San Ace dual ball bearing fan with PWM
•    Ultra-tight voltage regulation (+2% and -0% +12V rail)
•    Dual copper conduction bars on PCB for improved efficiency and performance
•    Supports multi-GPU technologies
•    Conductive polymer aluminum solid capacitors
•    High reliability 105°C Japanese made electrolytic capacitors
•    ErP Lot 6 2013 compliant and Intel Haswell processor ready
•    PCI-E 8/6 pin x 10, EPS12V/ATX12V x 2, SATA x 14, 4-pin Molex x 5, FDD x 1
•    High current Gold plated terminals with Easy Swap connectors
•    Active PFC (0.99 PF typical) with Universal AC input

Please continue reading our Seasonic XM2-1250 power supply review!

Cooler Master's new V-Series; good on the inside but perhaps lacking on externals

Subject: Cases and Cooling | July 28, 2014 - 02:25 PM |
Tagged: cooler master, V650S, modular psu, 650W, 80 Plus Gold

With a total rated power of 650W and two PCIe 6+2 power connectors the CM V650S seems to be aimed at entry level gaming systems but the $180 price tag suggests a high end PSU.  It is partially modular and it bears an 80 Plus Gold rating but perhaps the price also comes from Cooler Master's use of a new OEM, Enhance?  [H]ard|OCP did find it at a much more reasonable $80 on Tiger Direct but it is now out of stock and it does not seem to appear on NewEgg at all right now.   Overall there is a lot of good things to be said about the internals of the PSU but on the outside there is much left to be desired.  Check out the review but perhaps wait for the second version of the V650S before purchasing one.

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"Cooler Master has been off the enthusiast radar in terms of computer power supplies for a while now. It simply walked a different line than much of the rest of the field. Today however we have one of Cooler Master's second foray back into the high end with a mid-level PSU rated for operation at 650 watts."

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Source: [H]ard|OCP

Antec's TruePower 750W offers good performance at a good price

Subject: Cases and Cooling | July 8, 2014 - 02:47 PM |
Tagged: PSU, antec, 750w, 80 Plus Gold, TruePower Classic

[H]ard|OCP reviewed the highest powered model of the new TruePower Classic lineup, the 750W non-modular 80 Plus Gold rated PSU which has a lot of advertising hype to live up to.  Inside it is a highly modified Seasonic G-Series with quality capacitors, though the fan is only of middling quality.  This PSU did pass every test that was thrown at it bit did not quite provide the same high performance as other PSUs [H] tested that used the same design.  On the other hand at $103 it does not cost as much either making it a good example of compromise between extreme performance and extreme cost.

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"Antec comes to us today with a mid-level 750 watt enthusiast computer power supply that touts Gold efficiency. This PSU is somewhat light on marketing and heavy on features such as Japanese capacitors, "unprecedented tight voltage regulation," and low ripple and noise to "maximize your system's performance."

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Source: [H]ard|OCP

Modular 'flat pack' PSUs from Cooler Master

Subject: Cases and Cooling | June 23, 2014 - 02:22 PM |
Tagged: PSU, cooler master, Cooler Master V Series, 80 Plus Platinum, 80 Plus Gold, modular psu, 850W, kilowatt, 1200w

The three stars of the Cooler Master V Series, the 850W, 1000W and 1200W are up for review at Legion Hardware.  All three have a 135 mm fan for cooling and feature a single +12VDC rail though the amperage differs, 70A, 83A and 100A for the three respectively.  The two lower powered PSUs feature a 5 year warranty and are rated 80 Plus Gold while the 1200W carries a Platinum rating and a 7 year warranty.  The modular cabling is worth mentioning, it is flat which will allow you to have very clean cabling in your machine and may tip the scales towards this series if you like to keep your case clean looking. 

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"Finally, we have been very pleased with the Cooler Master V series, and believe that they would make a fine addition to any high-end gaming system. Enthusiasts will be able to invest their hard earned cash in a V Series power supply knowing it is backed by a full 5-year Cooler Master warranty, while the V1200 Platinum offers an industry leading 7 year warranty."

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EVGA's 650W PSU, still sporting that strange handle

Subject: Cases and Cooling | June 5, 2014 - 12:52 PM |
Tagged: evga, EVGA SuperNOVA, 650W, NEX650G, 80 Plus Gold, modular psu

The EVGA SuperNOVA NEX650G Gold is a 650W PSU capable of delivering 20A on each of it's 12V rails with a maximum of 53A in total.  As it comes with four 6+2 pin PCIe power connectors and an extra 6 pin it should be able to handle multiple mid-range GPUs, though as [H]ard|OCP discovered it can get quite loud under full load.  As it can be purchased for under $100 it is a 'good enough' choice for many enthusiasts who don't need a kilowatt nor have a lot of money to spend.  It may not stand out in the crowd but it certainly passed every test [H] threw at it.

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"EVGA does not have a lot to say about its SuperNOVA NEX650G Gold Power Supply. It does however mention it being designed with enthusiast needs, and this PSU being the "the best choice to power next generation enthusiast computers" with exceptional features, and stunning efficiency. We of course will be the judge of those claims."

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Source: [H]ard|OCP

Thermaltake Launches Modular Toughpower Gold Series Power Supplies

Subject: General Tech | February 26, 2014 - 11:19 PM |
Tagged: toughpower gold, thermaltake, power supply, 80 Plus Gold

Thermaltake has launched three new power supplies under its Toughpower Gold series. The new models come in 550W, 650W, and 750W capacities and offer up a semi-modular design and 80 PLUS Gold efficiency ratings.

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The new power supplies are rated at 87% to 92% efficient depending on the load and fall under the 80 PLUS Gold designation. Additionally, the PSUs offer a single rail design to deliver stable power to graphics cards and the processor. A semi-modular design has the 24 pin and 8 pin motherboard power connectors permanently attached and connection points for a variety of additional power cables. Thermaltake has gone for a flat cable design which should mean the cables are easier to route and hide behind the motherboard tray. Other features include high quality Japanese capacitors and a reportedly quiet 140mm fan that hits 18dB under typical loads.

The 550W offers two 8-pin PCI-E power connectors while the top end 750W version supports up to four 8-pin PCI-E power connectors meaning it can easily power CrossFire and SLI multi-GPU setups.

You can find more information on the Toughpower Gold power supplies on their respective product pages.

Unfortunately, pricing and exact availability has not yet been released.

Seasonic's S12G-550; you have to pay for prime power

Subject: Cases and Cooling | February 21, 2014 - 02:49 PM |
Tagged: PSU, seasonic, S12G-550, 550W, 80 Plus Gold

With an 80 Plus Gold rating and the ability to deliver 45A on its single 12V rail the 550W Seasonic S12G-550 PSU is perfect for a mid-range rig.  A pair of 6+2 PCIe connectors gives you a choice of powering a single high end GPU or two low or midrange GPUs.  It is also relatively small, barely larger than the 120mm cooling fan it uses though some may be turned off by its non-modular cables.  At around $85 it is not the least expensive model at that wattage but [H]ard|OCP's Silver Award proves it is worth it if you want solid power for your system.

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"Seasonic builds some of the best computer power supplies on the market. When do we ever get a power supply that is actually a better product than what it is marketed to be? Not often, but that is the case with the S12G-550 PSU. It is not terribly inexpensive, but it is a great value for your hard earned dollars."

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Source: [H]ard|OCP

Silverstone's Gold 750W PSU

Subject: Cases and Cooling | January 13, 2014 - 02:35 PM |
Tagged: Silverstone, strider gold s, ST75F-GS, 750w, 80 Plus Gold

The SilverStone Strider Gold S ST75F-GS is a decent choice to power a moderately powerful gaming PC with four 6+2 PCIe power connectors able to deliver up to 744W at 62A on its single 12V rail.  As well it is a rather short PSU at 6" long making it a good contender to power a system built in a smaller casing while still sporting an efficient 120mm fan.  In [H]ard|OCP's testing it didn't take top spot in any one category but did rate very highly on all tests, arguably a better result than a PSU that is top notch in one area but lacklustre in others.  With an MSRP of $135 and an 80 PLUS Gold rating it is a good choice though a better warranty would be greatly appreciated.

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"SilverStone is back today with its 750 watt computer power supply that is part of its S series. It is billed as the smallest 750w PSU that is fully modular. So this PSU should appeal to those looking to custom builds that could either have size or cable customization in mind. Does SilverStone keep with its longstanding quality traditions?"

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Source: [H]ard|OCP

Corsair's RM750 struggles to match the competition

Subject: Cases and Cooling | October 19, 2013 - 12:46 PM |
Tagged: rm750, PSU, modular psu, corsair, 80 Plus Gold, 750w

As the picture below makes clear, the Corsair RM750 is a fully modular PSU which lets you pick and choose exactly what cables you want present in your system.  The single 12v rail is rated at 62.5A which should handle two fairly powerful GPUs, there are four 6+2 PCIe power connectors to do so.  This unit is rated 80 Plus Gold and it did live up to that rating in [H]ard|OCP's testing.  Unfortunately the efficiency and silent operation were the only things [H] was impressed by as this unit really struggled in their testing and even those tests where it could manage a passing grade the PSU lagged behind the competition.

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"We have all read about Corsair power supplies and it is quite likely that many [H]'ers have one in their computer case right now. Today we are looking at Corsair's newest RM series power supply rated at 750 watts. The RM is built, "fully modular and optimized for silence and high efficiency." Let's see how it handles our grueling power tests."

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Source: [H]ard|OCP

Corsair Announces Nearly-Silent RM Series Power Supplies

Subject: Cases and Cooling | September 14, 2013 - 11:53 AM |
Tagged: rm series, PSU, Corsiar, 80 Plus Gold

Corsair has introduced its new RM series of power supplies. The new lineup replaces the TX series and sits between the existing HX and AXi series. RM-series PSUs are optimized for efficient and nearly silent operation.

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The new fully modular RM series power supplies are 80 PLUS Gold certified and range from 450W to 1000W. The PSUs reportedly use low noise capacitors and transistors along with a 135mm fan that only starts spinning under high load (what Corsair calls the “ZeroRPM Fan Mode”) such as gaming. In addition to quiet operation, the RM series supports monitoring functionality. Using Corsair Link software, users can monitor PSU fan speed and power delivery. A cable, called the Corsair Digital Bridge Cable, runs from the PSU to either the system motherboard or a Corsair Link Hub and enables the monitoring features. This cable comes bundled with the highest-end RM1000 (1000W) unit, but is an additional charge for the other RM series.

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The fully modular RM1000 and its bundled cables.

The lineup includes the RM450, RM550, RM650, RM750, RM850, and RM1000 in 450W to 1KW maximum loads respectively. These new PSUs will be available at the end of October for the following prices:

RM Series Power Supply SKU Price (MSRP)
RM450 $99.99
RM550 $109.99
RM650 $119.99
RM750 $129.99
RM850 $159.99
RM1000 $199.99
Source: Corsair