Reviews - Rosewill Fortress 750W
Sample Provided by: Rosewill (By Tazz on Wed, Sep-12-2012)

Page 4 - Taking a look inside the Fortress 750

Cracking open the Fortress 750, we find that it is using a Globe RL4Z B1352512H. It operates at 12V, has an amperage rating of 0.33A. Rated at 1500RPM, it has an airflow rating of 106 CFM, and has a noise rating of 29dB.

With the casing off, we can see that we still have a little room, which makes me wonder why they didn't go at least semi-modular with this unit. Fully modular would have been ideal in my book, but it is what it is. For those that don't recognize the OEM for the Fortress series, it's ATNG.


Starting with the AC line filtering, we have a coil and two Y capacitors (little blue ones). On the right we have a shot for them other side where we have two X capacitors (larger yellow ones).

On the PCB side we have a total of three more X capacitors, another coil, two more Y capacitors, and a MOV.

Here we have a shot of the two U15K80R mounted on the leading edge of the primary heatsink. 

Here on the primary side we have a pair of Rubycon MXC series 400V 220µF capacitors.


This daughter board is home to the PWM circuit. Unfortunately there are no markings on the chip to identify it.  

On the other side of the secondary heatsink we have the two remaining daughter boards which are home to the +3.3V and +5V DC/DC converters.

Looking around this unit, we can find capacitors from Nippon Chemi-Con, Teapo, and Rubycon.

We even have a few CapXon floating around.

Over on the back side of the PCB, we are able to locate the integrated protection circuit handled by a GR8313. 


As I was finishing up my photos, I rounded the last corner and noticed a few broken wires on the 12V side(above left). After talking with Rosewill and pointing out my issue, we had a second sample on the way. Unfortunately, the second sample showed a similar issue (above right). Granted the second one doesn't look as bad as the first, it was really hard to get a good shot.  


With two units on hand meant that I had twice the solder to look at as well. As we can see by the two above images, there is room for improvement on the soldering side.

While talking with my rep about the broken wire issue and questioning why ATNG was doing it the way they was. I pointed out that seeing how this was a single 12V unit, why don't they separate that cluster of wires and use three or four of the 12 open holes that are soldered over. To me it just makes sense to use what's available instead of cramming so many wires in one crimp.


As I was preparing to crack open the second sample, my rep had already emailed me a few updated images to show me that they was working on trying to resolve the issues that I had seen with my first sample. I don't know if they cranked the heat up or what, but the soldering in the first image does look better than what I have here. Looking at the second image, I told my rep that although that might help strengthen the wires at the crimp; to me it feels more like a Band-Aid than a fix. I then mentioned separating the wires in that last group again.

I was glad to see that Rosewill wanted to listen, and was open for suggestions. The fact that they was trying to make improvements immediately rather than two months or more down the road impressed me. I don't know how many times before that I've talked to companies and felt like they just blew me off and swept it under the rug. This definitely wasn't the case with Rosewill, which is good to see.

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