NZXT H2 Flow vs Phanteks XT M3 Case Comparison

NZXT H2 Flow and Phanteks XT M3 are both cases with the same Internal 2.5" Drive Bays (2) and Front Panel I/O (USB 3.2 Gen 1 Type A, USB 3.2 Gen 2x2 Type C). The main differences are in Internal 3.5" Drive Bays, Motherboard Compatibility, Dimensions and Volume.

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NZXT H2 Flow	Phanteks XT M3
Prices (Change region) In Stock Free shipping $149.99 Out of Stock $189.14	Prices (Change region) In Stock + $5.99 Shipping $44.99 (~~$59.99~~) $10.00 Mail-in rebate, $5.00 off w/ promo code: KDP248, ends 6/30 In Stock $71.49
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Brand NZXT	Brand Phanteks
Model CI-H21FB-01	Model PH-XT325M_BK01 PH-XT325M_DBK01
Release Date 📅 February 2026	Release Date 📅 July 2025
* First availability for purchase, it may not correspond to the actual market launch date.
User reviews Add a product review	User reviews Add a product review
Price history View Details ►	Price history View Details ►
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 Mid Tower
Color Black	Color Black
Includes Power Supply No	Includes Power Supply No
External 5.25" Drive Bays 0	External 5.25" Drive Bays 0
External 3.5" Drive Bays 0	External 3.5" Drive Bays 0
Internal 2.5" Drive Bays 2	Internal 2.5" Drive Bays 2
Internal 3.5" Drive Bays 0	Internal 3.5" Drive Bays 1
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, USB 3.2 Gen 2x2 Type C
Dimensions 263 mm x 181 mm x 435 mm	Dimensions 460 mm x 235 mm x 370 mm
Volume 21 L	Volume 40 L
Max VGA length allowance 331 mm	Max VGA length allowance 430 mm
Expansion Slots 3	Expansion Slots 4
Back Connect Support No	Back Connect Support No