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NZXT Guardian 921 RB 921RB-001-RD Black SECC steel chassis Computer Case

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  • SECC steel chassis
  • USB 2.0 / Audio / e-SATA Front Ports
  • 3 External 5.25" Drive Bays
  • 4 Internal 3.5" Drive Bays

  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

The Guardian 921 is Reborn — Meet the Guardian 921RB

Guardian 921RB reflects the structural integrity, gamer-design, and temperature monitoring system of the original while displaying a wide range of new features to complete the system builder’s dream budget case. A host of new features boast a bottom oriented power supply mount, CPU heatsink cutout, and an extra 140mm fan slot.

Game beyond your limits with Guardian 921RB.

  • NZXT Crafted Series Design: NZXT's latest addition to the Crafted Series takes cues from the gaming culture with elegant curves and a newly designed clear side panel
  • Spacious Interior and Solid Construction: Built from solid 0.88mm and 1.0mm steel, the Guardian 921 gives the user ample space for large, high-end video cards and space for up to four internal hard drives
  • Constant Temperature Monitoring: Three temperature probe monitoring system allows the user to constantly gauge thermals within the system at all times to prevent overheating
  • Multimedia and peripheral inputs: E-SATA, Intel HD audio, mic, and two USB inputs are standards with the Guardian 921, enabling maximum peripheral input
  • Silent Cooling: Comes standard with three 120mm fans installed to maximize cooling performance with minimal noise
  • Updated Design: The all new Guardian 921RB features a bottom mounted PSU, CPU heatsink cutout, and an extra slot for a 140mm fan at the top for more cooling performance. The all new Guardian 921 RB comes in both red/blue LED combinations

Learn more about the NZXT 921RB-001-RD

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 2 years
  • Limited Warranty period (labor): 2 years
  • Read full details
  • Return Policies
    • Return for refund within: 30 days
    • Return for replacement within: 30 days
  • This item is covered by's Standard Return Policy.
Ownership: more than 1 year
Verified Owner
2/ 5
Fans were bad and hardware did not last 12/4/2019 4:13:34 PM

Pros: Everything ran fine

Cons: System started overheating a couple weeks after putting together.
Serious frame issues unless the graphics are dropped to minimum.

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Ownership: more than 1 year
Verified Owner
4/ 5
Decent Temporary Case 1/25/2018 7:40:00 PM

Pros: - Hidden cable management area
- Easy-install HDD slots.
- Pretty colors.
- Decent stock fans.

Cons: - HDD bays prevent installation of graphics cards larger than approximately 11 inches.
- Some fan connectors are quite awkward to reach.
- Any (decent) graphics card in the PCIe x16 slot block access to 4 SATA ports.
- GPU cools better with the side of the case open.

Overall Review: This case served me well for the past 2 years.. was quite disappointed to find that newer graphics cards simply do not fit inside this case without modifying the case. Will consider purchasing NZXT again in the future.

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2/ 5
NZXT Does Not Honor Warranty, Says There Are No Parts to Cover These Now 6/8/2017 7:46:29 PM

Pros: Aesthetic appeal (especially when the blue LED 140mm is added to it)
Three fans included
Decent design
Plenty of bays
No issues mounting a stock water cooler

Cons: Sensors are not very accurate (for the four days my sensor display worked)
Dishonest warranty policy and poor customer service
Little in the way of cable management
Poor mounting screws
Defective sensor out of the box, and apparently no recourse for me in getting it swapped out

Overall Review: Mine was a gift a month ago, purchased new by my mother from a private individual (for whom it was a gift, as well). Got home, excited about it, ordered a NZXT 140mm fan with blue LED to fill the top exhaust port, waited for the fan and then changed my PC over. First issue, the new fan came with a burned out bulb. That's being RMA'ed as I type. Second, within a week, the temp sensor went out on me. You could thump it originally and it'd come on a second, then go back off. Now, nothing. Wrote NZXT, expecting no hassles from them on a two year warranty (read all the bragging they do about being TOPS in the industry in customer support, AND KEEP IN MIND that they are still selling the case), and first had a receipt demanded of me, which I don't have. With the serial number they shouldn't need more (it's a gift, most gifts don't entail receipts). BUT, IT GETS RICHER: the guy further says regardless, had I the receipt, THEY CANNOT GET THE PARTS TO HONOR THE WARRANTY IF THE SENSOR IS DEFECTIVE. No kidding--on a case that, as you see here, is still being sold brand new. No parts, man. So, if the sensor goes down on you, as it did me, etc., you've got to go through the HUGE hassle of sending the whole case in and RMA'ing through the distributor, etc. , I guess. No thanks. They're obviously not honest, which is a shame, as I really liked the case.

What a disappointment, man. Two brand new items in two weeks and both were defective out of the box--next go around, I'll be looking at anything and anyone but NZXT. Even if they take care of you on the warranty end of it, that I've manage two rotten apples in two tries makes me leery.

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Ownership: 1 week to 1 month
Verified Owner
3/ 5
it is ok. 2/11/2017 10:25:00 PM

Pros: It does come with a temperature monitoring system. It has a nice lighting scheme on the outside.

Cons: it only has three fan locations, and the front fan is completely blocked by the hard drive cage. The side window has a very dark tint, you can barely see the led fans through it.

Overall Review: The product pictures show the side window glowing red like the inside of the case hosting a party or something, that is far from true. That side window is way too dark, it should have been clear in my opinion.

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Ownership: 1 month to 1 year
Verified Owner
5/ 5
Beautiful and Simple 10/31/2016 11:40:16 AM

Pros: Great case. Thermal Probes are a great feature. A good solid case.

Cons: No instructions for mounting thermal probes to the Hard Drive, CPU and Case. Not hard though. Not worth a star to me.

Overall Review: The temp gauge for the probes only read out in celsius.

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Ownership: 1 week to 1 month
Verified Owner
4/ 5
Great case, easy to set up. 9/22/2016 4:25:06 PM

Pros: Screwless bays for drives.
Tons of room,
Good for wire management.
Great looking case.

Cons: The side fan almost looks like a swastika with the LEDs. Glad I didn't get red.
The full side panel doesn't glow like the picture.

Overall Review: I honestly love this case. I had an old beat up one. This was a fantastic upgrade.

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Ownership: more than 1 year
Verified Owner
5/ 5
Great case! 6/15/2016 11:43:16 AM

Pros: Great customer support and good amount of space with great airflow!

Cons: None.

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Ownership: more than 1 year
Verified Owner
3/ 5
6/14/2016 10:54:21 AM

Pros: Pros:
-Solid construction. Very sturdy.
-Can fit ATX Motherboards with no problems.
-Nice LEDs
-Temperature gauge is good for a basic gist of the temperature.
-Decent airflow.

Cons: Cons:
-VERY little space for cable management. The area behind the motherboard is only 1/3 of an inch. The other areas are small as well. If you're running a non-modular power supply, I don't suggest this case if you want the inside to be pretty.

-The 5.25" drive bays are riveted into place. you can't remove them to put in a bigger GPU.

-No PSU shroud. At this price I'd honestly expect one, even if it wasn't huge.

-No 2.5" SSD Slots.

-GPU slot plastic bracket things are VERY easily broken if you try to clamp them to the GPU.

-The side panel fan gets in the way of plugging in the power to the GPU if it's bigger than a single fan.

-Side panel window is very foggy and not easy to see through.

-Not easy to get to the front fan filter to clean it.

Overall Review: I like the case, and the way it looks. But the cable management is really, really bad. I bought a case for a build I did for my sister for $15 USD less than this that had exponentially better cable management, and a PSU shroud AND SSD slots.

I would recommend getting a different case. NZXT is a good company, but this case is a little botched.
(NZXT S340 is a better case, and around the same price range.)

1 out of 2 people found this review helpful. Did you?
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