The Eurocom 780W AC Power Adapter Review: Big Power For Big Laptops

The Eurocom 780W AC Power Adapter Review: Big Power For Big Laptops

While desktop PC power supplies get most of the attention of enthusiasts for good reasons – not the least of which is the wide selection of options that come from being a standard part – overall power supplies are only used for larger PCs. Not a concern for C. Most PC sales have shifted to notebook sales a few years ago, with notebook power supplies already leading the market in volume. And while mostly Laptops don't need the kind of massive PSUs that dominate the desktop space, though that's slowly changing as the desktop replacement class of laptops gets increasingly efficient and power-efficient. Consumption is increasing.

Perhaps the poster child for high-performance, high-powered laptops is Eurocom, which has a long history of producing heavy-duty DTR laptops that are more than just portable desktop systems. Following recent trends in GPU power consumption and the popularity of GPUs for both gaming and AI workloads, the company is selling a range of “mobile supercomputers”, which are essentially large, tailor-made laptops. Which also rival the best of desktop computers – and have the power requirements to match.

To power its high-end laptops, Eurocom has developed an exceptional 780W AC adapter for high-performance laptops. To make it the most powerful of powerful laptops, their latest power adapter can deliver three-quarters of a kilowatt of DC power. Desktop-like wattage for a desktop-like device. It's a laptop power adapter that's unique in its scale, and has some room to grow.

Eurocom 780W AC Adapter
Power specifications
Rail +20V
Maximum output 39A
Dimensions 325 x 110 x 40 mm, 1.38 kg
AC input 90 – 264 VAC, 50 – 60 Hz
MSRP PSU: $299Cable: $129+

Eurocom has offered this adapter for a few years now. But it's taken on a new life as more laptops have been released that use such a large adapter (or two small 300W-ish power adapters). And, critically, Eurocom has it. Made additional DC cable/connector sets for laptops from other manufacturers, significantly increasing the number of systems with which it is compatible. Currently, Eurocom offers DC cables for the following laptops.

  • Alienware M17x M18x; 1x DC cable; w/ barrel AW connector; 193 cm/6.4 ft
  • Alienware Area 51m; 1x DC cable + splitter box w/ 2x barrel AW connectors; 152cm/5ft
  • ASUS ROG G18 Strix; GX501V; GM501; GM501GM; GX531GM; 1x DC cable; w/ barrel ROG connector
  • ASUS G703GX, GZ700GX; 1x DC cable w/ 2x ROG barrel connectors; 152cm/5ft
  • CLEVO, OriginPC, Sager, XMG, EUROCOM laptops; 1x DC cable; w/ 4 pin round connector; 182 cm / 6 ft
  • CLEVO X370SNx; 1x DC cable; w/ square connector; 120 cm / 3.8 ft
  • CLEVO X170SM/X170KM; 1x DC cable; w/ dual square connector; 152 cm / 5 feet
  • Dell Precision 7720/7710; 1x DC cable; w/ barrel handle connector; 120 cm / 3.8 ft
  • MSI GE76, GT76, GT77, GE78HX Raider, Titan 18HX 1x DC cable; w/ single square connector; 120 cm / 3.8 ft
  • MSI laptops and MSI Trident AS gaming desktops; 1x DC cable; w/ 4 pin round connector; 182 cm / 6 ft

Eurocom 780W AC Adapter

Externally, the Eurocom 780W AC Adapter looks like a hybrid between a PC PSU and a laptop adapter. It looks like a large laptop AC adapter but has a metal body and cooling vents/fans. Eurocom advertises that it weighs “just 1.34 kg”, which by comparison is the weight of a full 14-inch laptop, but relatively light for a PSU with this kind of power output. The company logo is embossed on the top of the adapter, with four round anti-slip pads underneath. Care needs to be taken when moving it as the metal edges and weights can cause problems for wooden surfaces.

Eurocom installed a small information display on the AC adapter, which shows the current, voltage, and power output, as well as the temperature of the adapter. It's not exactly accurate – we could see it was reading a 12W load without the DC cable connected to the adapter – but it serves as a basic reference. Next to this, there is a heavy duty metallic connector for the DC cable. On the other hand we can find a typical three-prong C14 AC cable receptacle as well as an on/off switch, which is not usually found on laptop AC adapters.

Opening up the chassis, we can see that the Eurocom 780W AC adapter is not unlike typical PC PSUs – only less complicated by the need to build a 20V rail. The basic configuration is the same, with an AC filter on the input consisting of four Y capacitors, two X capacitors, and two sufficient filtering inductors, leading to a rectifying bridge. The GBJ1508 bridge is made by HY Electronic Cayman Ltd, a Taiwanese company that we are encountering for the first time.

Then we have an APFC circuitry with a large Aishi 450V/560μF capacitor and a large filtering coil as its passive components, a Toshiba K31N60W regulator with two MOSFETs on the same heatsink forming a typical half-bridge configuration. . We then have a small transformer and two Infineon 045N10N MOSFETs to produce the 20V power output. Cooling is provided by two Protecnic Electric MGT3812XB-W20 38mm fans, a small but high-quality product with a double ball bearing engine.

Test results (~25°C ambient)

To test the PSUs, we used a maximum power draw of 2700 watts, a Rigol DS5042M 40 MHz oscilloscope, an Extech 380803 power analyzer, two high-precision UNI-T UT-325 digital thermometers, a high-precision electronic load. have been. SPL meter, and various other bits and pieces.

The average efficiency of the Eurocom 780W AC adapter is very high, at 91.6% when the PSU is powered from a 230V AC source and drops to 90.9% when powered from a 115V AC source. There is no 80Plus or similar performance certification covering this PSU, but there is legislation such as the Ecodesign 2019/1782 Directive, and although the manufacturer does not fully publish its performance specifications as required by the Directive , the Eurocom 780W adapter looks simple. Meet them. We should mention that this type of PSU has an advantage over classic PC PSUs because it produces only one voltage line, and conversion losses are low, so it is directly comparable to any multi-voltage output PSU. should not be.

The Eurocom 780W AC adapter's two small fans seem tight for the unit's power output, mostly ignoring the adapter's temperature and simply adjusting their speed to match the load. At up to 40% load, which meets the power requirements of most gaming laptops anyway, the adapter is virtually completely silent. When the load exceeds 330 watts, the fan speed increases gradually, reaching terrible noise figures at maximum load. Given the nature of the adapter, it is highly unlikely that it will operate at such a high load for long, as even laptops that require a 2×330 watt adapter cannot sustain such a high load continuously. Will be able to keep.

Quality of power supply

The electrical performance of the Eurocom 780W AC Adapter is surprisingly good compared to its datasheet specifications. Eurocom claims a maximum voltage ripple of 200 mV but we recorded a maximum of 116 mV, which is fine for a 20 V rail and better than we expected due to minor secondary side filtering. Voltage regulation is very good, at only 1.2% in the nominal load range.

Main output
load (watts) 158.03 394.68 586.46 780.78
load (percentage) 20% load 50% load 75% load 100% load
Amperes Volt Amperes Volt Amperes Volt Amperes Volt
20 v 7.8 20.26 19.5 20.24 29.25 20.05 39 20.02

line Regulation
(20% to 100% load)
Voltage Wave (mV)
20% load 50% load 75% load 100% load
20V 1.2% 44 66 82 116

During our routine testing, we review the basic safety features of all power supply units we review, including over-current protection (OCP), over-voltage protection (OVP), over-power protection (OPP), and short circuit protection (SCP). The Eurocom 780W AC adapter behaves quite strangely here, as it has a rated output of 39 A and a maximum output of 45 A for 25 ms. However, we were able to draw 50 A from the unit for several minutes without triggering the OCP/OPP protection, which is about 1000 watts. The PSU did not show any serious signs of stress or overheating, nor poor power performance. OPP protection activates immediately once the load exceeds 50.3A – and immediately resets and restarts the PSU when the load drops below 50.2A. It appears that this platform was initially designed to be significantly more powerful and the OEM “forgot” to accommodate the OCP/OPP trigger points.


The Eurocom 780W AC Adapter combines raw power with innovation, offering a piece that's as awesome as it is interesting. With its considerable weight and metal edges, it demands respect and caution, especially on delicate surfaces. However, its weight is justified by the impressive power output it delivers, making it a powerhouse that somewhat overshadows its bulky, bulky seat design. The inclusion of a display for performance monitoring is a smart touch, though its accuracy leaves room for improvement.

On the inside, Eurocom doesn't skimp on quality. The adapter's internals are a testament to careful selection and engineering, closely mirroring the complexity and performance of high-end PC PSUs. Its cooling system, although compact, works well and provides good performance without compromising noise levels – at least under most loads. That said, the adapter's noise profile at maximum load may not be everyone's cup of tea, suggesting a balance between power and comfort.

Overall, Eurocom's 780W AC adapter has commendable performance and electrical efficiency. But as a premium priced product – a complete unit and cable will set you back at least. $429 – It could benefit from a touch more refinement, especially in terms of user safety and operational noise at higher loads. Otherwise, I'm personally a bit surprised that Eurocom isn't offering an open-ended cable for DIY enthusiasts, which could broaden its appeal and usefulness. Such an addition will not only cater to a wider audience but also highlight Eurocom's commitment to innovation and excellence.

Overall, while the adapter stands out for its power and performance, there is also a clear path for Eurocom to increase its appeal through minor, but impactful, improvements.

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