The POCO F8 Ultra and POCO X8 Pro Max share a surprising amount of DNA — both feature AMOLED screens with 3,500-nit peak brightness, 100 W wired charging, and silicon-carbon batteries — yet they target different priorities. The source author, who had hands-on time with both devices, reports that the key trade-offs come down to camera versatility, audio quality, and wireless charging on the Ultra side versus substantially longer battery life and more thermally stable sustained performance on the X8 Pro Max side. Here is a detailed breakdown of what each phone offers and where the differences actually matter.
What you need to know
- Both phones have 1.5K AMOLED displays at 120 Hz with 3,500-nit peak brightness, Dolby Vision, and HDR10+ support.
- The POCO F8 Ultra uses a Snapdragon 8 Elite Gen 5 (~3.8–3.9 million AnTuTu) while the X8 Pro Max uses a Dimensity 9500s (~2.6–2.7 million AnTuTu), but the latter is reported to throttle less under sustained load.
- The X8 Pro Max has an 8,500 mAh battery versus 6,500 mAh in the F8 Ultra — a 31% capacity advantage.
- The F8 Ultra adds a 50 MP periscope telephoto with 5× optical zoom, 50 W wireless charging, and a Bose 2.1 speaker system with a dedicated subwoofer — none of which the X8 Pro Max offers.
Display, sound, and build
On paper the screens are nearly identical. Both are AMOLED panels running at 120 Hz with 1.5K resolution, Dolby Vision, and HDR10+ certification. The X8 Pro Max measures 6.83 inches diagonally; the F8 Ultra is marginally larger at 6.9 inches — a difference the source author describes as virtually imperceptible.
The two phones have roughly equivalent screens
Audio is where the F8 Ultra pulls ahead. It features a Sound by Bose 2.1 speaker system with a dedicated subwoofer built into the chassis. The source author reports this delivers a noticeably different level of sound when playing music or watching video without headphones. The X8 Pro Max has stereo speakers with Dolby Atmos but lacks both the subwoofer and the Bose partnership.
Both phones carry IP68 water and dust resistance. The X8 Pro Max adds an IP69K certification, meaning it is rated to withstand high-pressure hot water jets — a rare spec for a smartphone.
Processor: raw power vs. sustained efficiency
This is the most nuanced difference between the two devices, and according to the source there is no outright winner — only different strengths.
The POCO X8 Pro Max runs a MediaTek Dimensity 9500s built on a 3 nm process with an All-Big-Core architecture (all eight cores are high-performance). It scores roughly 2.6–2.7 million in AnTuTu. Its reported advantages are exceptional energy efficiency, minimal heat under load, and stable performance during extended gaming sessions with little to no thermal throttling.
The POCO F8 Ultra runs a Qualcomm Snapdragon 8 Elite Gen 5, also on 3 nm, described in the source as the most powerful mobile processor currently available. It scores roughly 3.8–3.9 million in AnTuTu — approximately 45% higher. Its GPU, the Adreno 840, is cited as the strongest option for demanding gaming scenarios.
The source author adds an important caveat: under sustained heavy loads the Snapdragon 8 Elite Gen 5 heats up and throttles, reducing performance, whereas the Dimensity 9500s is somewhat more thermally stable. For everyday tasks — media consumption, messaging, browsing — the practical difference between the two chips is described as minimal. The gap is felt only in extreme workloads.
Camera: the biggest differentiator
According to the source, the camera system is where the price gap is most clearly justified.
The POCO F8 Ultra (right) has a significantly more capable camera system
POCO X8 Pro Max — dual camera
- 50 MP main sensor (Light Fusion 600), f/1.5, OIS
- 8 MP ultra-wide — described as basic
- No telephoto lens at all; zoom is digital only
POCO F8 Ultra — triple camera
- 50 MP main sensor (Light Fusion 950), 1/1.31-inch, f/1.67, OIS — a noticeably larger sensor that captures more light
- 50 MP periscope telephoto, 5× optical zoom, OIS
- 50 MP ultra-wide — three times the resolution of the X8 Pro Max’s ultra-wide
Sample photo from the POCO F8 Ultra’s periscope telephoto at 5× zoom. Image: gsmarena.com
The 5× periscope telephoto is highlighted as a transformative feature for shooting distant subjects with detail — concerts, sports, wildlife, and distortion-free portraits. The X8 Pro Max relies solely on digital crop zoom when you need to get closer, which inevitably loses quality.
The source author’s bottom line on cameras: if photography matters to you, the gap between these two phones is enormous. If you rarely shoot or mostly use the wide-angle lens, the difference is minimal.
Battery and charging: the X8 Pro Max’s strongest card
The POCO X8 Pro Max packs an 8,500 mAh silicon-carbon battery versus 6,500 mAh in the F8 Ultra — a 2,000 mAh (31%) advantage. Both batteries use silicon-carbon chemistry. The source author reports this capacity gap translates to roughly half a day of extra screen time in practice. The X8 Pro Max is said to last two full days under active use and up to three with moderate use. The F8 Ultra manages a solid day of active use, or about a day and a half with lighter usage.
Both phones charge at 100 W over a cable. The F8 Ultra adds 50 W wireless charging, which the X8 Pro Max lacks entirely. For users who rely on wireless charging pads at home or in the office, this is a meaningful addition.
Which phone suits which buyer?
Two very powerful POCO smartphones compared
Based on the source author’s analysis, the choice breaks down along clear lines:
The POCO X8 Pro Max may be the better fit if you:
- Prioritize maximum battery life (8,500 mAh, reported two-day active use)
- Play demanding games for extended sessions (the Dimensity 9500s is said to sustain performance more consistently without overheating)
- Rarely use zoom when taking photos
- Do not need wireless charging
The POCO F8 Ultra may be the better fit if you:
- Shoot frequently and value optical zoom (the 5× periscope telephoto with OIS is a fundamentally different tool)
- Care about speaker quality without headphones (Bose 2.1 system with subwoofer)
- Use wireless charging regularly (50 W wireless)
- Need peak processing power for short, intensive workloads (Snapdragon 8 Elite Gen 5)
In short: the X8 Pro Max is the battery and thermal-efficiency champion. The F8 Ultra is the camera, audio, and wireless-charging champion. The price premium is justified only if at least one of the Ultra’s exclusive features — telephoto camera, Bose audio, or wireless charging — is important to you. If none of those matter, the X8 Pro Max covers most use cases at a significantly lower price.
