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Rosewill RGD1000 1000W Modular Power Supply

Rosewill promises plenty of power for your high end rig with the RGD1000 at a good price, but does it truly deliver?

Manufacturer: Rosewill
4 minutes & 56 seconds read time

Introduction, Specifications, Availability and Pricing

Rosewill RGD1000 1000W Modular Power Supply 01


With the ever increasing power demands of modern CPU's, GPU's and computers in general, 1000 watt power supplies are becoming more readily available outside of the big names and leading manufacturers. Rosewill offers quite the selection of power supplies, ranging from 300W to 1000W that will fill just about whatever void you are looking for. Today we are taking a look at the RGD1000 from Rosewill and we'll find out if it is worthy of your hard earned money.

The RGD1000 offers quite bit of power for your system and looks quite impressive on paper. It promises 1000W of continuous power with a 50C rating to keep your system running during those long and hot gaming sessions. It also offers six PCI-E connectors for those interested in running multi-GPU systems and a single 12V rail. The modular design lets you keep your case neat and tidy while allowing you to make sure that you have plenty of connections for whatever configuration you need.

These are just some of the highlights that Rosewill's RGD1000 has to offer, but the important question to ask is if it can deliver quality power to keep your rig going when you need it most.

Specifications, Availability and Pricing

Rosewill RGD1000 1000W Modular Power Supply 02

The RGD1000 gives you a single 12V rail to power various components, which should be ample for just about any system out there. The single rail design frees you from having to load balance the system and simplifies installation.

Rosewill RGD1000 1000W Modular Power Supply 03

Newegg lists the RGD1000 for $179.99 with a 3-year warranty, which puts it in the same price bracket as ThermalTake, SilverStone, Antec and others. While it is in stock and available, Rosewill is only available at Newegg in the USA. This isn't a huge issue so long as the RGD1000 is kept in stock, but can quickly become an issue when it goes on backorder.

Rosewill gives you absolutely everything you can ask for concerning features, including the 50C rating, Active PFC and Over-Temperature Protection.

The Packaging

Rosewill RGD1000 1000W Modular Power Supply 04

External packaging and design is at a bare minimum on the RGD1000. This is due to Rosewill only being available via e-tail and will never be seen on a shelf by a customer. Both the front and back of the packaging are identical.

Rosewill RGD1000 1000W Modular Power Supply 05

The sides of the box are also identical and completely void of any information relating to the RGD1000.

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The bottom of the box identifies the particular unit that we have and origin of manufacture.

Inside the Box

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Cracking open the box, we can see that things are packed quite tightly and securely. The manual is on top of the foam protecting the power supply and the modular cables are in the soft case on the left.

Rosewill RGD1000 1000W Modular Power Supply 08

After removing the top layer of foam, we finally get a glimpse of the RGD1000. Note that the permanently attached cables are held together by a reusable Velcro cable tie instead of the usual twist tie. Extra cable management is always nice to have included.

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Rosewill opts to place the specification label on the top of the PSU rather than the side like most. For those that are looking for a clean look through a window, this is a hard to find aesthetic feature.

Rosewill RGD1000 1000W Modular Power Supply 10

The back of the RGD1000 uses a honeycomb design for maximum airflow. Note the connection for the power cable isn't square with the rest of the PSU. This isn't something that you normally see. It was quite secure and wouldn't move at all and just shows a minor lack of attention to detail.

Rosewill RGD1000 1000W Modular Power Supply 11

Here we see the side of the PSU lacking the spec label and the clean look that it offers. Both sides are identical.

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The front of the PSU is clearly labeled for all of the modular cables and can be easily read even if your case requires the PSU be mounted upside down.

Rosewill RGD1000 1000W Modular Power Supply 13

On the bottom we see the large 135mm fan which keeps the PSU cool while also keeping the noise down.

Cabling Arrangement

Rosewill RGD1000 1000W Modular Power Supply 14

Rosewill gives you plenty of cables and connections to utilize the full 1000W available from the RGD1000. Attached directly to the PSU are the 20+4 main, ATX 4+4, EPS12V, and two 6+2 pin PCI-E connectors. Rosewill offers up four more 6+2 pin PCI-E connectors for some 3-way GPU love and tops things off with six peripheral cables that add eight 4-pin Molex, 12 SATA, and two floppy connections.

Rosewill RGD1000 1000W Modular Power Supply 15

All of the modular cables and more are held inside the reusable soft case via elastic straps.

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This shows the entire contents of the soft case. Rosewill also includes some zip ties and offers both conventional screws and thumb screws for mounting the RGD1000 in the case.

Rosewill RGD1000 1000W Modular Power Supply 17

A single 12V rail provides power for all connectors on the RGD1000. This simplifies installation and the need to balance the load on your own.

A Look Inside


Opening up the RGD1000 shows two rows of heatsinks. While we've certainly seen better designs for thermal dissipation, a design such as seen above allows for efficient airflow throughout the entire power supply.

Rosewill RGD1000 1000W Modular Power Supply 19

Rosewill RGD1000 1000W Modular Power Supply 20

Both the primary and secondary sides feature Japanese capacitors and are rated for 105c.

Test Results and Final Thoughts

Test Results

Our load tests utilize a couple of FAST ATE active load testers and a variety of other equipment such as an oscilloscope, power conditioner, temperature probe and a power consumption meter. You can read more about our standard testing approach here.

The tests performed are based around six conceivable setups that are out there and progressively load down the PSU up to the power supply's limits or 1000W, whichever comes first. Since our test equipment's limits are equal to the output of the Rosewill RGD1000, we can test it to the maximum.

Rosewill RGD1000 1000W Modular Power Supply 21

Rosewill RGD1000 1000W Modular Power Supply 22

Initial testing proved promising, but things went downhill rather quick with the RGD1000. The 3.3V and 5V rails just don't manage the load quite well and get close to being out of specifications by Test 4.

In Test 5, the 3.3V rail drops all the way down to 3.05V and the 5V rail is at the limit. Pushing the RGD1000 to the max shows the 5V rail also dropping below ATX specifications. Efficiency, however, is right where it should be to support the 80Plus Gold rating that the unit has received.

As there is no specific test at 50%, it is impossible for us to tell if it hits the 90% efficiency as required, but even if it doesn't, it is very close.

Final Thoughts

Rosewill offers quite a bit on paper with the RGD1000. Superficially it appears to be everything you could want in a high wattage power supply. It promises plenty of connections, a 50C rating, 80Plus Gold efficiency, and all the voltage and current protections you can get. Even upon opening the box there were high hopes for this unit, as it appears of quality and would look good in just about any rig.

Unfortunately the RGD1000 fails to deliver where it matters most. While it isn't uncommon to see high wattage power supplies border on failing tests at the maximum, the RGD1000 showed signs of sub-par voltages at around 70% load. As you will see in some of the upcoming PSU reviews here at TweakTown, there are simply other power supplies that perform better than the RGD1000 for your money and that are in the same output range as this Rosewill unit.

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Zac provides professional IT support by day, but plays the role of enthusiast by night. He's been building high-end custom computer for the nearly fifteen years and writing PC hardware reviews for the better part of a decade. Aside from computers, he also dabbles in quite a bit of home A/V equipment. Throughout the years, Zac has picked up an extensive knowledge of power circuitry and leverages this to provide the PSU reviews. When not found testing or writing, you can often find him speeding through the winding countryside on his motorcycle.

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