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Compare NZXT H2 Flow vs Cooler Master MasterBox E300L

The main differences between NZXT H2 Flow and Cooler Master MasterBox E300L are in External 5.25" Drive Bays, Internal 2.5" Drive Bays, Internal 3.5" Drive Bays and Motherboard Compatibility.

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NZXT H2 Flow

Cooler Master MasterBox E300L

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Brand

NZXT

Brand

Cooler Master

Model

CI-H21FB-01

Model

MCB-E300L-KN5N-B02
MCB-E300L-KN5N-B01
MCB-E300L-KN5N-B00

Release Date

📅 February 2026

Release Date

📅 November 2018

* First availability for purchase, it may not correspond to the actual market launch date.

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Price history

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Compatible PC parts

Motherboards ► Graphics Cards ► Power Supplies ► CPU Coolers ►

Compatible PC parts

Motherboards ► Graphics Cards ► Power Supplies ► CPU Coolers ►

Type

Mini ITX Tower

Type

MicroATX Mini Tower

Color

Black

Color

Black/Silver

Includes Power Supply

No

Includes Power Supply

No

External 5.25" Drive Bays

0

External 5.25" Drive Bays

1

External 3.5" Drive Bays

0

External 3.5" Drive Bays

0

Internal 2.5" Drive Bays

2

Internal 2.5" Drive Bays

3

Internal 3.5" Drive Bays

0

Internal 3.5" Drive Bays

2

Motherboard Compatibility

Mini ITX

Motherboard Compatibility

Micro ATX, Mini ITX

Front Panel I/O

USB 3.2 Gen 1 Type A, USB 3.2 Gen 2x2 Type C

Front Panel I/O

USB 3.2 Gen 1 Type A

Dimensions

263 mm x 181 mm x 435 mm

Dimensions

448 mm x 180 mm x 364 mm

Volume

21 L

Volume

29 L

Max VGA length allowance

331 mm

Max VGA length allowance

363 mm

Expansion Slots

3

Expansion Slots

4

Back Connect Support

No

Back Connect Support

No

-

Options (6)

	MB500 RGB $125.63
	MB511 $67.31
	Lite 3.1 $49.99
	K501L
	MB600L $68.99
	Lite 5 RGB

Comparison and key differences summary

Reasons to buy the NZXT H2 Flow:

Newer Product, it was released around 7 years later
Supports the following front panel USB ports: USB 3.2 Gen 2x2 Type C

Reasons to buy the Cooler Master MasterBox E300L:

57% cheaper, you can save $85.00
+1 external 5.25" bays
+1 internal 2.5" bays
+2 internal 3.5" bays
Additional VGA length allowance (+32.00mm)
+1 Expansion slots
Supports the following motherboard formats: Micro ATX
Moderately more space available (+29% total case volume)

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