Samsung Galaxy S25 Ultra vs Vivo X300 Ultra

Samsung Galaxy S25 Ultra

The Snapdragon 8 Elite for Galaxy delivers a meaningful generational jump in both CPU and GPU, rivaling Apple's A18 Pro and outscoring the iPhone 16 Pro Max in multi-core. The 40 percent larger vapor chamber keeps the phone cool even under sustained gaming loads. The r/apple thread citing a 36% GPU lead over the iPhone 16 Pro Max generated heated discussion, with most commenters conceding the Snapdragon chip is genuinely fast even if they still wouldn't switch.

• The phone benchmarks crazy high, rivaling Apple's A18 Pro — a little lower in single core but higher in multi-core.
• Samsung's 40 percent larger vapor chamber keeps the phone from warming up in normal use and benchmarks are up 30-40 percent depending on the task.
• Playing Genshin Impact at max settings for nearly an hour produced no stutters and no hot spots — a noticeable improvement over the S24 series.
• Multi-core Geekbench hits 9,793 versus the iPhone 16 Pro Max at 8,772 — the S25 Ultra pulls ahead thanks to extra cores and 12GB of RAM.
• The Snapdragon 8 Elite is the most welcome generational upgrade this year, with a boosted 'for Galaxy' variant delivering more CPU headroom than the standard chip.
• Under heavy loads the S25 Ultra becomes a bit power-hungry, which can cause faster-than-expected battery drain when multitasking or running demanding apps.
• Everyday tasks run smoothly and there was no meaningful performance difference versus the OnePlus 13 running the same chip.
• Apple users on r/apple concede Apple has fallen behind on GPU performance, saying 'competition is good' after the S25 Ultra posted a roughly 36% GPU lead in benchmarks.

Vivo X300 Ultra

Snapdragon 8 Elite Gen 5 plus Vivo's custom imaging silicon delivers flagship benchmark numbers and strong gaming, but the camera-heavy hardware runs hot — sustained stress tests show roughly 60–65% stability and the camera app warms it up fast.

• At the heart is Qualcomm's current flagship Snapdragon 8 Elite Gen 5, supplemented by Vivo's custom VS1 and V3-Plus imaging chips.
• It boots in 16 seconds (vs 21s for the S26 Ultra and 19s for the iPhone 17 Pro Max) and posts an AnTuTu score over 3,800,000, stronger than Samsung.
• In a prolonged stress test it throttled CPU performance to about 60% of peak — in line with other high-powered flagships — and 3DMark stability landed around 63–66%.
• It gets a bit hot after 30–40 minutes of gaming, but with no throttling even past an hour and never uncomfortable to hold; boost mode at max graphics gives around 4 hours of Wuthering Waves on a full charge.
• Native 120fps gaming with smooth/very-high graphics in many titles, with temperature barely crossing 35°C and power draw around 4W in battle-royale modes.

Samsung Galaxy S25 Ultra

The 5,000 mAh battery is unchanged but the more efficient chip pushes real-world endurance comfortably beyond a day — Engadget measured 29h 27m video runtime, Mrwhosetheboss got nearly 9 hours of screen-on time. Wired charging tops out at 45W, wireless at 25W. The Qi2 Ready implementation without built-in magnets is a consistent frustration, and Reddit users openly say the OnePlus 13's silicon-carbon battery was the more exciting release this year.

• Most days end with 60 percent left over — good but not amazing for a modern flagship.
• Local video rundown lasted an incredible 29 hours 27 minutes — almost two hours longer than the S24 Ultra.
• Battery life is just under 9 hours of total screen-on time per charge, regularly ending days with 30-40 percent remaining.
• Standby time after half a year of use remains excellent — never a single battery issue during long-term testing.
• Qi2 Ready is frustrating — you need a third-party magnetic case for MagSafe-like functionality, and some cases have weak magnets that pop off.
• Samsung is cutting corners by calling the phone Qi2 Ready without including magnets, and as the biggest phone maker it should do better.
• The S25 Ultra loses in both capacity and longevity to the OnePlus 13, which packs a 6,000 mAh silicon-carbon cell.
• Samsung stuck with the same 5,000 mAh cell rather than upgrading to silicon-carbon battery tech like the OnePlus 13.
• 'The OnePlus 13 was a more exciting release for me, with their new battery tech. Samsung has gotten pretty complacent, for the price they're asking.'

Vivo X300 Ultra

Vivo grew the silicon-carbon cell 10% to 6,600mAh while keeping the body the same size. Real-world endurance is strong — ~16h active-use score, ~7h heavy screen-on, 13–14 hour days with charge to spare — and 100W wired refills it in under an hour, with 40W wireless.

• Vivo increased the battery by 10% to 6,600mAh despite the phone being practically the same size on paper.
• In our battery test it earned an active-use score of almost 16 hours; 100W charging took it 0–66% in 30 minutes and a full charge in 46 minutes, plus 40W wireless. A charger is in the box except in Europe.
• On the China version I'm finishing entire 13–14 hour days with 25–30% left; the global version keeps the 6,600mAh cell so battery life should comfortably last 12–13 hours of heavy use.
• Getting nearly 7 hours of screen-on time with very heavy usage from the 6,600mAh silicon-carbon unit, with 100W wired and 40W wireless charging support.
• After a 4-hour heavy-usage simulation the phone still had ~45% battery left, which is solid by today's standards, and 100W wired charging takes about 45 minutes to full.