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Item#: N82E16811147211

Rosewill Legacy U3-B-Window Black Aluminum Alloy MicroATX Mini Tower Computer Case

  • M-ATX Mini Tower
  • Front I/O Ports, USB3.0
  • One Rear 120mm Speed Adjustable Fan
  • 2 Internal 3.5" Drive Bays
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With its simple surface, subtle curves, meticulous aluminum alloy build, attention-grabbing clear side window, and four gleaming metal stands, you'll fall in love with the Rosewill Legacy U3 mini tower case at first sight. But don't get fooled by its micro-ATX mini tower form factor; it's designed to support high-performance hardware effortlessly. Inside the chassis you'll find room to fit an M-ATX/ITX motherboard, standard PSII power supply, performance graphics card, and tower CPU cooler. A 120mm rear fan is pre-installed for efficient, quiet cooling. Along with the latest USB 3.0 connectivity on the front panel, the Legacy U3 is a great choice for your next PC build.

  • newegg Sleek Design The aluminum alloy construction with a clean design presents a high-quality feel and stylish appeal, making it great to build your HTPC or bedroom PC.
  • newegg Transparent Side Window Lets you show off your high-end components.
  • newegg Efficient Cooling One 120mm speed-adjustable rear fan, with loads of air vents, delivers effective cooling for the system. The speed control is located behind the fan.
  • newegg Compatibility Accommodates an M-ATX/ITX motherboard (within 245mm x 245mm), standard PSII power supply, graphics card up to 260mm long, and CPU cooler up to 175mm high. Also includes two internal 3.5" drive bays.
  • newegg Front USB 3.0 Connectivity Two USB 3.0 ports and two audio ports on the front panel allow handy connection to peripherals.

Learn more about the Rosewill Legacy U3-B-Window


Legacy U3-B-Window


MicroATX Mini Tower
Case Material
Aluminum Alloy
With Power Supply
Motherboard Compatibility
M-ATX / ITX (within 245mm x 245mm)
With Side Panel Window


Internal 3.5" Drive Bays
Expansion Slots

Front Ports

Front Ports
2 x USB 3.0 Ports
Audio In/Out

Cooling System

120mm Fans
1 x Rear 120mm Fan
Side Air duct

Physical Spec

8.19" x 10.63" x 14.13" (W x D x H) (0.47" feet not included)
5.51 lb.


- Please make sure your motherboard equipped with on-board USB 3.0 socket before purchasing.
- For certain M-ATX motherboard with SATA connectors on the side, please use L-shaped SATA cables.
- CPU Cooler: Not Higher than 175mm
- Display Card: Not Longer than 260mm

Ideal for Intel & AMD Systems

Support Standard ATX PSII PSU

Sturdy Construction

Ventilations for Display Card. (within 260mm)

One Build-in Speed Adjustable Rear Fan

Front I/O Ports : 2x USB3.0, Audio Out, MIC in

Drive Bays:
- Side Plate: 1 x 3.5" HDD Rack
- Base Plate: You can install either 2 x 2.5" HDD or 1 x 3.5" HDD

Quick Info


  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year

Customer Reviews of the Rosewill Legacy U3-B-Window

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  • Andrew B.
  • 4/6/2014 6:39:08 PM
  • Tech Level: Average
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggslooks amazing

Pros: looks amazing, can't get enough of it

very small for a MicroATX case with the feet it's 20.8L and still fits full size cpu coolers, as far as i know there isn't anything smaller that can do that.

Not sure if this is a pro, but it's been probably 2 years since i've had an optical drive in a computer and this is one of the few cases that doesn't offer a bay for one, makes the case look a lot cleaner from the outside

Cons: when it arrived part of the back panel where the fan mounts was warped although after removing the fan it mostly went back to normal on its own, so just be careful when mounting fans.

Also even though this case fits ATX psu's i wouldn't go too big, the aluminum isn't extremely thick and this case only weighs 2.5kg (~5.5lbs) and as far as i know there aren't many ATX psu's less than that. Doesn't affect me since i'll probably use a 450w SFX psu i already have, but could affect some people

Also I'd do a fair amount of research before buying this case since i was originally going to put a Maximus VI Gene in it but after looking at the space limitations and lack of cable routing options decided to downsize to an Impact.

Oh front panel cables are WAY too long, I actually desoldered the USB 3.0 cables off the front panel circuit board.

Oh no filters included (well aside from on the exhaust fan which seems pointless), wasn't an expensive fix though, ~$15 for double sided tape at a crafts store and ~$3 for half a square meter of filter fabric from a fabric store (obviously isn't sold as filter fabric, but it looks the same). I only put the filter on the outside of the bottom vent though in case the tape lets go and i didn't want the filter to be visible.

Not really a con but 140mm fans with 120mm hole spacing won't fit.
Just things to consider

Other Thoughts: Didn't realize before starting this review how many cons there are compared to pros, but to me they're all things you can work around and considering the size and look of the case it's still well worth it.

still piecing together this build so nothing is actually inside the case yet, special ordering parts, determining what i need for cables, and figuring out the best places to mount hard drives is taking a while.

Did you find this review helpful? Yes No

  • Brian L.
  • 1/6/2014 2:36:07 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggsDecent case, could use better documentation

Pros: The case is overall very well made. The aluminum construction is solid, the window was not scratched and hold steady to the case and the case feet are very nice. The case layout overall is very good both for space and cooling. I am running a 4770 + 560ti with no temperature problems.

Cons: The documentation is fairly horrendous. As the other reviewer stated, the PSU bracket is probably useless or we both have not figured out how to use it. Long GPUs are difficult to install (plug in first and put in before big heatinks) and cable management is hard. Also this is a very tool involved install since there are still many screws to work with and the thumbscrews are all initially very tight.

2 out of 4 people found this review helpful. Did you? Yes No

  • Derek D.
  • 12/27/2013 9:38:47 PM
  • Tech Level: Somewhat High
  • Ownership: 1 day to 1 week

5 out of 5 eggsExcellent case

Pros: - Packaging was simple and compact
- The case itself has a very nice, premium texture that does not flex
- It looks amazing with the window and my parts inside
- The included fan is very quiet, even at the highest fan position

Cons: - The case did come with some minor white marks that I wiped away or scraped away with my fingernail
- The included bracket to help keep the power supply up did not align properly with the holes. The power supply is held only by the screws in the back for my case which is still fine.
- The hard drive rack blocks my view of the GPU
- Noise isolation is not the best
- The booklet lists the number of parts you should have and I had an extra in a few categories, so I was a little confused trying to separate everything

Other Thoughts: Despite the cons, this is still a solid case to own. It is well built and sturdy. The cons are only minor things that I noticed while transferring my setup. I am happy with my purchase and I hope to keep it around for quite some time.

4 out of 4 people found this review helpful. Did you? Yes No

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Item#: N82E16811147211
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