NZXT H6 Flow vs Phanteks XT Pro Ultra

Researched, not hands-on tested.How we review ›

all judged against PC cases at a similar price

The NZXT H6 Flow scores 7.2/10 overall, ahead of the Phanteks XT Pro Ultra at 6.7/10.

The NZXT H6 Flow leads on airflow and cooling, build and ease of building and noise.

The Phanteks XT Pro Ultra leads on space and compatibility and value.

NZXT H6 Flow

7.2/10verdict: good, not the best

The NZXT H6 Flow is for builders who want a mid-tower with strong cooling and an easy build. It suits gaming and general desktop systems with a graphics card, an air cooler or a top-mounted radiator, and only a few drives. It is less suited to storage-heavy builds or anyone who wants a quiet system at full fan speed.

Typically about £84.98 in the UK when we researched itSearch Amazon UK

Affiliate link. As an Amazon Associate I earn from qualifying purchases. Details

Phanteks XT Pro Ultra

6.7/10verdict: good, not the best

The Phanteks XT Pro Ultra is a mid-tower for builders who want a mesh-fronted case with fans already fitted. It suits people planning a large graphics card, a tall air cooler or a 360 mm radiator. It is less suited to anyone who puts quiet running or a rigid side panel first.

Typically about £76.99 in the UK when we researched itSearch Amazon UK

Affiliate link. As an Amazon Associate I earn from qualifying purchases. Details

Scores, criterion by criterion

Criterion	Weight	NZXT H6 Flow	Phanteks XT Pro Ultra
Airflow and cooling	30%	8/10	7/10
Build and ease of building	20%	8/10	6/10
Space and compatibility	20%	7/10	8/10
Noise	15%	5/10	4/10
Value	15%	7/10	8/10
Overall		7.2/10	6.7/10

Specifications

Spec	NZXT H6 Flow	Phanteks XT Pro Ultra
Case type (mid tower, Micro-ATX, small form factor…)	Mid-tower, dual-chamber	Mid-Tower
Motherboard sizes supported (E-ATX, ATX, Micro-ATX, Mini-ITX)	ATX, Micro-ATX, Mini-ITX	E-ATX (up to 280 mm wide), ATX, Micro-ATX, Mini-ITX; rear-connect boards supported for MSI Project Zero, ASUS BTF and Gigabyte Project Stealth
Maximum graphics card length (mm)	Up to 365 mm (14.4 in)	415 mm; GPU width 184 mm
Maximum CPU cooler height (mm)	Up to 163 mm (6.4 in)	184 mm
Power supply type supported (ATX or SFX) and maximum PSU length (mm)	ATX power supply type, up to 200 mm PSU clearance	Maximum PSU length 270 mm; bottom mount
Radiator support (e.g. 360mm top, 280mm front)	Top up to 360 mm; rear up to 120 mm; top radiators up to 30 mm thick	Top: max 360 mm; Front: max 240 mm; Rear: 120 mm
Fans included and fan mounts	Three pre-installed F120Q 120 mm fans in the front-right position, 1,200 ± 240 RPM, 62.18 CFM, 25.1 dBA; top takes three 120 mm or two 140 mm; rear 120 mm included; bottom takes two 140 mm intake	Four M25-140 D-RGB fans included; top 3x 120 mm or 2x 140 mm; front 3x 120 mm or 3x 140 mm; midplate 3x 120 mm; rear 1x 120 mm or 140 mm
Drive bays (3.5 and 2.5 inch)	not listed	5x 2.5-inch plus 1x 3.5-inch HDD, or 3x 2.5-inch SSD plus 2x 3.5-inch

Strengths and weaknesses

NZXT H6 Flow

+ Four fans included, with room for a 360 mm top radiator
+ Owners praise thermal performance and easy cable management
+ Fits GPUs up to 365 mm and coolers up to 163 mm
− Owners report limited drive storage support
− Owners report fan noise at high speed
− GPU temperatures rise when lower fan mounts are filled

Skip it if:

Builders who need space for several storage drives
Buyers who want a quiet system with the fans at full speed
Anyone who wants a fan or RGB controller included in the box

Read the full NZXT H6 Flow review ›

Phanteks XT Pro Ultra

+ Four D-RGB fans included
+ Roomy: 415 mm GPU, 184 mm cooler, E-ATX
+ Owners praise cable routing and value
− Owners report noisy stock fans
− Side panel flex reported by owners
− Only two 3.5-inch bays at most

Skip it if:

Buyers who put quiet running first and don't want to deal with stock fan noise.
Anyone building a storage-heavy system with several 3.5-inch hard drives.
Buyers who want a rigid side panel.

Read the full Phanteks XT Pro Ultra review ›

More comparisons

Compare all PC cases · Best PC cases