400 vs P3x 5G

Phone 1

Phone 2

Winner

Honor 400

Lifespan decides this one: the 400 is supported until May 2031 at $5.92 per month of safe use, while the P3x 5G runs out in Feb 2029 ($4.64/month). On a which-lasts-longer question, that's not a tie — it's the whole answer.

Value Score: 400 76 · P3x 5G 73 — methodology

The lifespan decider

When specs are close, support length decides it — this is what each phone costs per month of safe use.

Honor 400 $350

Safe to buy$5.92/mo

2025◆ Buy-by May 20292031

Realme P3x 5G $150

Buy with care$4.64/mo

2025◆ Buy-by Feb 20272029

Category by category

Display

400 80P3x 5G 70

The 400's screen is the better one — 6.55-inch amoled, 1.5k, 120hz, 5000 nits peak.

Performance

400 64P3x 5G 55

The 400's Qualcomm Snapdragon 7 Gen 3 (4nm) is simply the faster chip.

Camera

400 72P3x 5G 55

The 400 has the stronger camera system (2 real rear lenses vs 1).

Battery

400 86P3x 5G 100

6,000mAh vs 5,300mAh — the P3x 5G lasts longer between charges.

Software longevity

400 70P3x 5G 38

The 400 is supported until May 2031 — 27 months longer than the P3x 5G.

Value

400 76P3x 5G 73

Pound for pound, these two are equally good deals.

Full spec table

Spec	400	P3x 5G
Price (street)	$350	$150
Display	6.55-inch AMOLED, 1.5K, 120Hz, 5000 nits peak	6.72-inch IPS LCD, FHD+, 120Hz
Chipset	Qualcomm Snapdragon 7 Gen 3 (4nm)	MediaTek Dimensity 6400 (6nm)
RAM	8GB/12GB	6GB/8GB
Storage	256GB/512GB	128GB
Battery	5,300 mAh	6,000 mAh
Charging	66W wired (5300mAh EU model), 5W reverse wired	45W wired SuperVOOC
Rear cameras	200MP main, 12MP ultra-wide	50MP main, 2MP depth
Dimensions	156.5 × 74.6 × 7.3 mm	165.7 × 76.2 × 7.99 mm
Weight	184 g	197 g
Water resistance	IP65/IP66 (market dependent)	IP68/IP69
Supported until	May 2031	Feb 2029

400 full verdict →P3x 5G full verdict →Longevity master board →

Scores and verdicts are computed from our verified database — see exactly how. Specs from manufacturer documentation; prices reflect major US retailers.