ASUS logo MPN: 90DC00H0-B08000

ASUS A21 CASE/BLK Mini Tower Black

ASUS
Released: Not on record
$69.99
Amazon.com (US)
Updated 2 months ago · Compare Retailers USD pricing from verified retailers · Excl. sales tax
View price history ↓
4.4 / 5 (45 ratings)
View reviews breakdown
Form Factor
Mini Tower
Motherboard
Micro ATX,Mini-ITX
Max GPU
380 mm
Max Cooler
165 mm
Colour
Black
Depth
465 mm
Width
220 mm
Height
430 mm
View 30 specifications

Overview

DISCOVER HIDDEN POTENTIAL
The ASUS A21 is a PC case crafted for minimalist mainstream DIY PC builders, with support for a variety of AIO coolers and graphics cards, and plenty of airflow potential to keep things running smoothly.

BROAD COMPATIBILITY
Despite being a micro-ATX case, the A21 still supports up to 360 mm radiators, graphics cards up to 380 mm in length and CPU air coolers up to 165 mm in height, giving builders plenty of options to assemble their next PC.

CAPABLE COOLING
The front-panel mesh of the A21 is 40% porous to maximize the balance of airflow and RGB visibility. Users can add up to three 120 mm fans to this section of their build to solidly manage system temperatures.

Compatibility

Form factor Mini Tower

Compatibility data is automatically generated. Always verify critical specs before purchase.

Technical Specifications

Showing 28 key specifications of 30

All values come from this product’s catalog record.
Form factor
Mini Tower
Supported board sizes
Micro ATX,Mini-ITX
Maximum graphics card length
380
Maximum CPU cooler height
165
Type
PC
Colour
Black
Depth
465 mm
Width
220 mm
Height
430 mm
Weight
7300 g
Audio input
Yes
On/off button
Yes
Cable management
Yes
Maximum PSU length
210
Number of 2.5" bays
1
Number of 3.5" bays
2
Supported HDD sizes
2.5,3.5
Number of 5.25" bays
0
Number of expansion slots
5
Top fans diameters supported
120,140
Top radiator sizes supported
120,140,240,280,360
Rear fans diameters supported
120
Rear radiator sizes supported
120
Front fans diameters supported
120,140
Front radiator sizes supported
120,140,240,280,360
Number of top fans supported (max)
3
Number of rear fans supported (max)
1
Number of front fans supported (max)
3
Show all 30 specifications
Audio output
Yes
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity
2

Not ranked yet

Awaiting Benchmark Run

No joined ranking record is available for this product. Products enter category rankings automatically once verified benchmark and price records are indexed.

Market Value History

Latest Spot: $69.99
30D Average
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90D Average
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1Y Low / High
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Raw Price History Records52 data points
DatePrice
2026-04-16$69.99
2026-04-10$82.49
2026-01-01$69.99
2025-12-12$59.99
2025-12-02$69.99
2025-11-20$58.99
2025-11-14$69.98
2025-11-03$75.99
2025-10-30$73.49
2025-10-24$64.99
2025-10-08$64.99
2025-09-22$66.99
2025-09-08$62.99
2025-09-02$43.81
2025-08-18$57.99
2025-07-28$64.99
2025-07-07$57.99
2025-06-10$87.12
2025-04-01$64.99
2025-03-17$57.99
2025-03-04$64.99
2025-02-25$57.99
2025-02-18$64.99
2025-02-10$57.99
2025-01-24$64.99
2025-01-09$64.99
2024-12-02$64.99
2024-11-25$54.99
2024-11-21$39.99
2024-11-11$65.99
2024-10-21$59.99
2024-10-08$56.99
2024-09-09$64.99
2024-09-02$71.25
2024-08-26$67.39
2024-08-20$62.48
2024-08-12$67.82
2024-08-05$74.99
2024-07-29$96.71
2024-07-15$69.99
2024-07-08$54.99
2024-06-18$69.99
2024-06-03$59.99
2024-06-01$69.99
2024-05-07$64.99
2024-04-29$69.99
2024-04-18$54.99
2024-04-09$76.98
2024-04-01$76.99
2024-02-27$69.99
2024-02-10$76.99
2023-12-30$69.99

Customer Reviews & Feedback

Verified Amazon Score
4.4 / 5.0

Based on 45 verified customer reviews on Amazon US.

5 star
79%
4 star
13%
3 star
4%
2 star
2%
1 star
2%

Review Verification

Hardware Quest synchronizes these ratings daily with Amazon to reflect real buyer experiences, build quality, and long-term reliability.

Verified Retailers & Price Comparison

Verified Amazon US pricing, transparent seller identity, and real-time fulfillment telemetry via Keepa.

1 Stores Tracked
Amazon US Lowest Price
In Stock · Amazon.com (Direct)
$69.99 Free Prime Delivery
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Sources

Product lifecycle

Catalog: on-market

The current catalog record marks this product as on-market; this is not independent manufacturer confirmation.

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