Zippy Emacs PSL-6850P G1 850w PSU Page: 1

Just over a month ago I was given the opportunity to review one of Zippy Emacs first power supplies designed for the consumer market. Rated at 600w, the GSM-6600P proved to be an amazingly stable PSU with great efficiency and a sleek brushed aluminium casing. This combination of beautiful design and beastly power led to the unit obtaining our "Editors Choice" award, and a lot of people asking "Where can I get one?!?!". Hearing these cries of desperation, our friends over at Specialtech quickly hooked up with Zippy Emacs and will shortly have a full range of G1 units ready for worldwide delivery here.

Today I'll be looking at Zippy Emacs top-of-the-range PSL-6850P 850w unit with a massive 60a on a single +12v rail. Will this unit build on the excellent properties of the GSM-6600P? Let's find out...

About Zippy
"Founded in April 1983, ZIPPY Technology Corporation started out with the design and development of Switches, specializing in mold tooling and material engineering. The success of our Switches Division set the stepping-stone for a multitude of advancements in the upcoming years.

Riding amidst the wave towards rapidly developing e-business, our Power Division was established in 1993 and quickly set a strong foot-hold in the research and development in power supplies, particularly in Server Power Supply and Redundant Power Supply.

With more than twenty years of experience, we are more than confident to face the 21st century’s rapid advancement in electronics, biotechnologies and nanotechnologies. Working as a team, our staffs are ready to face any challenges heading our way."


The first thing you will notice about the PSL-6850P is the size and weight of its box. Substantially longer and heavier than the packaging of most other power supplies we've reviewed in the past (even some 1kw units), I was certainly appreciative for the carry handle on top.

Zippy Emacs G1 850w Packaging Zippy Emacs G1 850w Packaging

Zippy Emacs G1 850w Packaging Zippy Emacs G1 850w Packaging

All sides of the packaging have a brushed aluminium effect, very much like the recently reviewed GSM-6600P. The front of the box is printed with a picture of the unit along with some basic information on the best applications for the PSL-6850P.

The back of the box is where you'll find the most information on the unit. As previously mentioned in the GSM-6600P review, the English translation is pretty poor, but Zippy Emacs have informed OC3D that they will be working on this for future revisions of the packaging. Some of the units most notable features include a single +12v rail, High efficiency and SLI / Crossfire compatibility.

Zippy Emacs G1 850w Contents Zippy Emacs G1 850w Contents

The PSL-6850P is protected from knocks and dents by a single walled cardboard box and is sandwiched between two Styrofoam mouldings. These prevent the unit from moving around inside the box during any rough journeys.

Just like the GSM-6600P, the PSL-6850P package contains a sheet of paper with the test results from a Chroma ATE DC load stress tester. This is the kind of thing we would normally expect from a highly respected PSU manufacturer such as PCP&C, and therefore is a very reassuring inclusion with the Zippy Emacs unit.

The full contents of the box are as follows:
• 1x Mounting bracket for supporting PSU weight.
• 4x ATX screws.
• 1x Zippy Emacs manual.
• 1x Chroma ATE test report.
• 1x Zippy Emacs 850w PSU.

Zippy Emacs PSL-6850P G1 850w PSU Page: 2

The following information has been taken directly from Zippy Emacs' website:

• Support INTEL and AMD dual core or multiple CPU's
• Support dual 6 pin for PCI-E
• NVIDIA SLITM-ready certified
• Support ATI CrossFire
• Smart fan control
• Metal clip that prevents power cord from fall-off
• Unplug-easy type of drive connectors
• Various protections implanted: OCP/ OVP/ OPP/ Short circuit
• Exceptional stability for all outputs under various system loading
• Iron-gray coating case
• Active PFC
• Efficiency 71%(200W), 76%(420W),71%(850W) at 110V 40℃
• TEMPERATURE RANGE : OPERATING 0℃ --- 40℃, STORAGE –20℃ --- 80℃
• HUMIDITY : 20 ~ 80 % RH
• OVER CURRENT PROTECTION : + 3.3V à 33 A ~ 45A, +5V à 49.5 A ~ 67.5 A, + 12V à 66A ~ 90A
• OVER VOLTAGE PROTECTION : + 3.3V à 3.7 ~ 4.1V, +5V à 5.7V ~ 6.2V, + 12V à 13.3 ~ 14.3V

Specs Nvidia SLI Certified

To summarise the above information, the PSL-6850P has a single +12v rail rated at a massive 60 amps with the +3.3v and +5v rails rated at 30 and 45 amps respectively. The unit also incorporates security features such as OCP, OVP and OLP, which prevent damage to the power supply when voltages or load go outside of specification.

Zippy Emacs PSL-6850P G1 850w PSU Page: 3

One of the excellent features of GSM-6600P had to be its sexy brushed aluminium casing. Have Zippy Emacs continued this trend on the PSL-6850P, or do they have another surprise up their sleeves for us? Lets take a look...

Zippy Emacs G1 850w Top Zippy Emacs G1 850w Badge

I was slightly disappointed to see that Zippy Emacs didn't go with an all aluminium casing for the PSL-6850P, however they certainly haven't gone for a plain black exterior either. The unit is actually sprayed in a highly metallic black paint that not only feels very durable, but looks amazing when light is reflected off it at different angles.

Zipyp Emacs G1 850w Back Zippy Emacs G1 850w Side

Yet again, Zippy have opted for a "punched" fan grill. In my opinion this makes the unit look rather dated. A much better option would have been a black wire fan grill seen on most modern power supplies.

The PSL-6850P has the ability to auto-detect input voltage and switch between 110v/240v accordingly. This means there is no requirement for a voltage selection switch on the back of the unit.

The unit also features two metal posts either side of the power plug that can be used in conjunction with the included brace. These prevent the power cord from coming loose when the computer is moved or the cord accidentally pulled - A feature often only seen on server power supplies.

Zippy Emacs G1 850w Front

The front of the unit sports a full sized honeycomb grill that provides ventilation for the 80mm fan installed at the back. We can also see that Zippy Emacs have opted to hold the bundle of cables protruding from the unit together with a large cable tie. As mentioned in the previous GSM-6600P review, this is perfectly acceptable but does allow for more movement of the cables inside the unit and could eventually lead to a cable or solder joint breaking.

Zippy Emacs PSL-6850P G1 850w PSU Page: 4
Cables & Connectors

All cables on the PSL-6850P are sleeved up to the first connector in a black mesh and finished off with cable ties covered with black heat shrink tubing. The overall sleeving job is excellent, but I was slightly disappointed to see that the sleeving didn't go all the way inside the unit - instead stopping about 5cm short.

Zippy Emacs G1 850w Cables Zipyp Emacs G1 850w Cables

The PSL-6850P is supplied with a total of 9x Molex, 6x SATA and 2x PCI-E connectors. This should more than enough for any kind of high-end PC system or server, however it would be nice to see 4x PCI-E connectors on future versions of the unit as it has more than enough power to warrant this.

Zippy Emacs G1 850w ATX Zippy Emacs G1 850w EPS

The unit comes with a 24-Pin ATX connector and no way of reducing the connector down to 20-Pin. People wanting to use this unit on an older style 20-pin ATX motherboard will need to purchase a 24-Pin to 20-Pin connector separately. Quite a few of the most recently released motherboards still utilise the 4-Pin (P412v) connector, and for this reason Zippy Emacs have included both P412v (4-pin) and EPS12v (8-pin) cables on the unit to ensure full compatibility.


Floppy SATA Molex

Zippy Emacs PSL-6850P G1 850w PSU Page: 5
Looking Inside

As with all power supplies that pass through Overclock3D, I'll be taking a look inside the PSL-6850P. By doing this I should be able to get a good idea of the overall build quality of the unit and how it is likely to perform in our tests.

Zippy Emacs G1 850w Inside Zippy Emacs G1 850w Inside

Zippy Emacs G1 850w Inside Zippy Emacs G1 850w Inside

The PSL-6850P utilises a total of 4 aluminium heatsinks to help keep the components inside the unit cool. You will also notice that the largest of the 4 heatsinks is covered with what appears to be a thermal pad. Whether this is just to isolate the internal components from touching the outer casing or if it has been put in place to transfer some of the unit's heat to the outer casing is uncertain.

The unit did feel quite jam packed, and I was disappointed to see the bulk of cables entering the unit obscuring a large portion of the grill at the front of the unit, possibly causing unnecessary heat issues. This issue could have been improved by bunching the cables together using cable ties, but ultimately the layout of the PCB could do with re-working.

Zippy Emacs G1 850w Fan Zippy Emacs G1 850w Fan

The main cooling for the PSL-6850P is provided by an 80mm Delta fan, situated at back-left of the unit. As airflow inside the unit is quite restricted, Zippy Emacs have also decided to implement a 40mm fan manufactured by Sanyo Denki. This provides cooling to the right-hand side of the unit that would otherwise have been starved of airflow. The specification of both fans is as follows:

Model: Sanyo Denki SanAce40
Dimensions: 40mm x 40mm x 28mm
Air Flow: 16.8cfm
Noise: 44dba
Speed: 12500rpm

Model: Delta EFB0812SHF
Dimensions: 80 x 80 x 32mm
Air Flow: 54.95cfm
Noise: 45.5dba
Speed: 4700rpm

With both fans rated at an ear piercingly loud 44 - 45dba, the PSL-6850P certainly hasn't been designed with the silent PC in mind. Thankfully both of these fans are kept as silent as possible when the unit is idle by the integrated fan controller.

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Load Testing

In order for the results from all current and future PSU reviews to remain fair and comparable, Overclock3D uses a custom built Power Supply load stress tester. The tester will be placing the following loads on each of the PSL-6850P's rails:

+3.3v - 20a Load
+5.0v - 20a Load
+12v - 60a Load

The results are collected from a Mastech MAS-345 Multimeter which logs its readings via RS232 to a PC.

Zippy Emacs G1 850w +3.3v Zippy Emacs G1 850w +5.0v

Zippy Emacs G1 850w +12v

All rails on the PSL-6850P remained well within ATX specifications throughout the testing. The +3.3v and +5v showed the least fluctuation of between 0.01v-0.04v, with the +12v rail suffering from slightly more fluctuation but still performing reasonably well considering the load it was placed under.

Efficiency Testing

Efficiency tests are performed by measuring the wattage consumed by the power supply at the mains against the power (in watts) consumed by the OC3D power supply stress tester. These results may not be 100% accurate, but have proven to be extremely close to results obtained from professional equipment.

Zippy Emacs G1 850w Efficiency

The PSL-6850P was placed under a load of 886 watts. This counts for a total of 104% of the power supplies rated output. At this load, the power supply required 1042 watts from the mains. Therefore the efficiency of this power supply can be found by a simple equation: (886 / 1042) * 100, which works out to be an efficiency rating of 85.0%.

Noise Testing

Possibly the hardest part of any PSU review is summarising the level of noise given out by the unit. The threshold for what is considered 'noisy' varies from person to person and therefore what I may consider a quiet unit, another person may consider extremely loud. A common way to resolve this issue is to use a dBA meter to measure the units noise level, however this doesn't take into account the pitch (type) of noise emitted and whether it is likely to irritate end users.

For this reason OC3D records all power supplies at idle and load in wav format for you to make your own informed decisions. All recordings are taken at 30cm away from the PSU and outside of a PC case. You will need to remember that noise levels will be reduced by varying amounts once the PSU has been installed inside your PC enclosure.

Idle Recording - Download
Load Recording - Download

After finding out that the PSL-6850P was cooled by two 44dba+ fans, I must admit thinking that this was going to be one very loud PSU indeed. However, it would seem that Zippy have done a good job of controlling the fan speeds at idle and under medium load with the unit sounding significantly quieter than I was expecting.

At full load, the fan speed slowly increased to counteract the extra heat being produced by the unit. This in turn increased the noise output of the unit significantly making it rather loud - as you will be able to hear from the recordings above.

Zippy Emacs PSL-6850P G1 850w PSU Page: 7

With reports of new graphics cards consuming around 300w on the horizon, the Zippy Emacs PSL-6850P has chosen a good time to make its début into the market. When you consider that 300w equates to around 25 amps, there aren't many PSU's available that can deliver this kind of amperage on a single rail whilst also providing enough power for the rest of the devices in your system.

In my personal opinion, the single railed PSU is going to play a big part in powering future graphics cards (at least until PSU manufacturers re-work their current rail arrangements) and it's good to know that the PSL-6850P with its single +12v rail rated at 60a will be able to meet these demands.

In terms of performance, the PSL-6850P gave some good numbers. Managing to keep both the +3.3v and +5v rails under -0.04v fluctuation, with the +12v rail showing a little more fluctuation and dropping from 12.17v to 11.99v. However, considering this rail was stressed to its full capacity of 60a, you'd be naive not to expect a small dip in output voltage.

The PSL-6850P will soon be available from Specialtech. Prices are yet to be confirmed.

• Single +12v rail makes unit a good choice for future GPU's.
• High efficiency at 85%.
• Plenty of connectors.
• Sexy looking metallic finish.
• Sleeved cables.
• Good voltage stability under heavy load.

• Noisy under full load.
• Packaging needs some work.
• Internals could be arranged better for optimal cooling.


Thanks to Zippy Emacs for providing this unit for review.

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