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The Dimensity 6400 Max leads the cited comparison’s CPU and overall benchmark scores, and its platform offers a key practical advantage: 5G. The Helio G99 is a 4G chipset with a lower listed peak Cortex-A76 clock. Both are listed with an octa-core CPU, 6 nm process, Mali-G57 MC2 graphics and LPDDR4X memory. Treat the benchmark figures as results from the named comparison, not guarantees for every phone.
Helio G99 vs Dimensity 6400 Max: specifications
The table combines MediaTek’s official specifications for the Helio G99 and standard Dimensity 6400 with the 6400 Max entries shown by 91mobiles. MediaTek’s cited Dimensity page is for the standard 6400, not the “Max” name, so it does not independently establish that the two labels have identical specifications.
| Specification | Helio G99 | Dimensity 6400 Max |
|---|---|---|
| CPU | 2× Cortex-A76 up to 2.2 GHz and 6× Cortex-A55 up to 2.0 GHz, according to MediaTek | 2× Cortex-A76 up to 2.5 GHz and 6× Cortex-A55 up to 2.0 GHz, according to 91mobiles |
| Manufacturing process | TSMC N6 / 6 nm class, according to MediaTek | 6 nm, according to 91mobiles |
| GPU | Mali-G57 MC2 | Mali-G57 MC2, according to 91mobiles |
| Memory and storage support | LPDDR4X and UFS 2.2, according to MediaTek | LPDDR4X and UFS 2.2 are specified for the standard Dimensity 6400 by MediaTek; 91mobiles lists LPDDR4X for the Max |
| Cellular network | 4G/LTE platform | 5G is documented for the standard Dimensity 6400 by MediaTek; 91mobiles presents the Max as the 5G-side option |
| Display and camera capabilities | Up to 120 Hz display and 108 MP main camera, per MediaTek | Up to 120 Hz Full HD+ AMOLED and up to 108 MP camera are listed for standard Dimensity 6400 by MediaTek, not confirmed there for the Max |
Sources: 91mobiles comparison, MediaTek Helio G99 specifications, and MediaTek Dimensity 6400 specifications. A chip’s listed display or camera capability does not mean every phone using it includes that feature. Likewise, a shared process-class label does not prove equal power use or sustained speed.
Benchmark comparison: published results
91mobiles displays the following results for the Helio G99 and Dimensity 6400 Max comparison. The site labels the AnTuTu results as tested; all figures below are the values shown on its comparison page, accessed in 2026.
#1 Best Overall
- 【122dB Speaker & Infinite halo】Ulefone Armor 21 rugged smartphone has a diameter up to 36 mm and bulky 11.5 CC sound cavity. With 3.5W huge power, up to 122dB loudness, offering unprecedented super loud HiFi quality sound. Infinite halo injects unlimited energy for you, different features enables different halo mode. You will be the star of the party, shining brightly!
- 【IP68/IP69K/MIL-STD-810H Proof】Meeting IP68, IP69K, MIL-STD-810H certification standards, the rugged machine resist 1.5m under water, high pressure, dust, drops, crashes and extreme temperature of－20℃-55℃.
- 【Most Powerful Performance】MediaTek Helio G99 chipset brings 8-core CPU, 2.2GHz frequency, together with 8GB of RAM + 8GB Virtual RAM, 256GB internal storage and 2TB expanded storage space, fresh Android 15 OS, Armor 21 rugged phone runs without latency.
- 【Amazing Camera】Armor 21 rugged phone comes with a 64MP Sony IMX686 main sensor, massive 1/1.7" photosensitive element, 4-in-1 1.6μm large pixels and 16MP Selfie Camera. The upgraded third generation infrared night vision camera brings higher 24MP pixels, better algorithm and lower interference.
- 【Fantastic Screen】6.58-inch FHD+ screen with resolution of 1080 x 2408. 120Hz extra-high refresh rate and 240Hz touch sampling rate.
| Benchmark | Helio G99 | Dimensity 6400 Max |
|---|---|---|
| AnTuTu total | 380,698 | 448,625 |
| AnTuTu CPU | 103,329 | 142,456 |
| AnTuTu GPU | 86,021 | 70,692 |
| AnTuTu memory | 90,352 | 101,408 |
| AnTuTu UX | 100,996 | 134,069 |
| Geekbench single-core | 575 | 799 |
| Geekbench multi-core | 1,766 | 2,049 |
In those displayed results, the Dimensity 6400 Max is ahead in the total AnTuTu score and both Geekbench scores. The AnTuTu breakdown is not uniformly higher: the G99’s listed GPU component is higher. Since both entries use the same GPU name, that component difference is a reminder that a GPU label alone does not settle a benchmark outcome.
These scores are not a controlled same-phone test. Cooling, memory and storage configuration, software, power limits and the specific handset can affect results, so they should be read as the comparison page’s figures rather than a promise of performance in a particular device.
Rank #2
- MTK Helio G99 & 20+256GB Storage: Elevate your digital experience with the advanced capabilities of the FOSSIBOT F102 Rugged Smartphone. The cutting-edge MTK Helio G99 Processor ensures extremely fast speeds, making multitasking and app usage seamless. Backed by a substantial 20(12GB Fix+8GB Virtual) RAM and 256GB ROM Storage, this phone accommodates all your data, photos, and files. Enjoy smooth transitions between tasks and immersive gaming, all powered by this dynamic duo.
- 108MP+32MP+20MP+5MP Camera: FOSSIBOT F102 rugged phone Featuring a stunning 108MP rear camera,make your photos come to life with remarkable detail and clarity. The 32MP front camera ensures your selfies are picture-perfect, while the 20MP night vision camera enhances low-light photography, capturing moments even in darkness. From breathtaking landscapes to intricate close-ups, the FOSSIBOT F102 empowers you to capture every moment in stunning quality.
- 16500mAH Battery & 33W Fast Charge & OTG Reverse Charge: Stay connected and empowered for longer stretches with the extraordinary 16500mAh battery. No need to worry about constant recharging. The 33W Fast Charge technology rejuvenates your device in no time. The OTG Reverse charge feature lets you share your phone's energy with other devices, transforming your smartphone into a portable power supply.
- 6.58" FHD+ Display & 120Hz Refresh Rate: Immerse yourself in a visual feast with the FOSSIBOT F102's 6.58" FHD+ Screen featuring an impressive 120Hz refresh rate. Every interaction with your device becomes a delight, as visuals come to life with exceptional clarity and fluidity. Whether you're gaming, streaming, or simply scrolling through content, the vibrant display enhances your experience like never before.
- 495 Lumens Super Bright Camping Light: Venture into the great outdoors with confidence, armed with the FOSSIBOT F102's 495 Lumens super bright camping light. Offering three levels of brightness, an SOS mode, and an explosive flash setting, this feature ensures you're prepared for any situation. Whether it's a camping trip, a hike, or an unexpected emergency, this versatile light keeps you safe and well-illuminated.
Keep standard Dimensity 6400 results separate
NanoReview compares the G99 with the standard Dimensity 6400—not the 6400 Max—and reports a different set of results. Its AnTuTu 11 scores are 554,590 for the G99 and 581,041 for Dimensity 6400, based on 313 and 11 samples respectively. Its Geekbench 6 results are 727 versus 803 single-core and 2,047 versus 2,047 multi-core, based on 82 and 8 samples. These figures use a different chip label, benchmark versions and sample sizes from the 91mobiles Max comparison, so they cannot be merged into one head-to-head table.
The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →NanoReview’s gaming averages are for a Cubot X70 on the G99 side and have no corresponding Dimensity 6400 result. They are not a direct gaming comparison. The source also cautions that gaming FPS can vary with game version, operating system and other factors. See NanoReview’s standard Dimensity 6400 comparison.
Rank #3
- 【Compact & Convenient & Mini body】As wide as a credit card and light in weight, offering convenient one-handed operation at your fingertips. Effortlessly take it with you in your pockets or bags (❗5.25 x 2.49 x 0.98 inches, 10.6 ounces).
- 【MediaTek Helio G99 & 16GB + 256GB】2.2GHz 8-core CPU and powerhouse 6nm Soc, 8GB RAM (up to 8GB of virtual RAM) allows multiple memory-hungry apps to run snappily at the same time. 256GB of internal storage as well as TF card expansion supported 2TB.
- 【64MP+50MP+32MP Camera】Housed OMNVISION'S OV64B 64MP night vision camera with two infrared LEDs, Upgraded Ulefone NightElf Ultra 3.0 algorithm with lesser interference. The primary camera adopts 1/1.31"ultra large 50MP Samsung's ISOCELL GN1 image sensor, featuring a 1.2um pixel size with an F/1.95 aperture. 32MP Selfie Camera featuring the Samsung GD1 Sensor, 5P lens, 80.4° field of view.
- 【6200mAh sub-zero solid-state Battery】Never will shut down in extreme cold as low as -20 degrees. Enabled the ultra power saving mode can outlast the standby time to up to 26 day. It also supports 33W Fast Charge, 15W Wireless Charging and Reverse Charging.
- 【Corning Gorilla Glass & Ruggedness & Waterproof】4x the ability cratches and drops. The Armor Mini 20 Pro rugged phone meets MIL-STD 810H standards and reaches IP68 and IP69K levels for supreme protection against water, dust, dirt, sand, humidity and even salt mist.
Which chipset is better for your needs?
Choose based on 5G requirements first
The network generation is the clearest practical dividing line: the Helio G99 is a 4G/LTE platform, while MediaTek documents 5G for the standard Dimensity 6400. MediaTek describes the standard 6400 modem as 3GPP Release 16 compliant; that official statement does not specifically name the 6400 Max. Before buying, verify that the exact phone variant supports the 5G bands used by your carrier and region.
For CPU-heavy tasks, the listed Max specifications point ahead
The 6400 Max entry shown by 91mobiles gives its two Cortex-A76 cores a peak clock of 2.5 GHz, compared with 2.2 GHz for the G99. Its Geekbench scores and total AnTuTu score are also higher in that comparison. This supports a result-specific advantage, not a guarantee that every phone with the Max will feel faster under all workloads.
Rank #4
- 【Thermal by FLIR 3.5】The built-in FLIR Lepton 3.5 thermal micro-camera can detect infrared light from objects above absolute zero (-273°C), Armor 27T Plus can penetrate darkness, glare, smog, and dense smoke to detect heat. It also features FLIR's patented MSX and VividlR image processing technologies for the most advanced imagery available.
- 【MediaTek Helio G99 & 24GB + 256GB】Power-efficient Helio G99 with the robust Arm Mali-G57 MC2 GPU, 12GB RAM (up to 12GB of virtual RAM) allows multiple memory-hungry apps to run snappily at the same time. 256GB of internal storage as well as TF card expansion supported 2TB(❌Not compatible with AT&T or Cricket).
- 【64MP+50MP+32MP Camera】Housed OMNVISION'S OV64B 64MP night vision camera with two infrared LEDs, Upgraded Ulefone NightElf Ultra 3.0 algorithm with lesser interference. The primary camera adopts 1/1.31"ultra large 50MP Samsung's ISOCELL GN1 image sensor, featuring a 1.2um pixel size with an F/1.65 aperture. 32MP Selfie Camera featuring the Samsung GD1 Sensor, 5P lens, 80.4° field of view.
- 【10600mAh Battery + 33W Flash Charge + 30W Qi】No worrying about battery exhaustion, 33 watts of high-speed charging allows you to be connected all day without recharging frequently. It also supports 30W wireless charging and wireless reverse charging.
- 【6.78” FHD+ Corning Gorilla Glass Victus】2460x1080 Resolution, 20:9 Aspect Ratio, 396 PPI and 120Hz Refresh Rate. Corning Gorilla Glass Victus screen incorporates 4 times scratch resistance and can survive drops up
For gaming, compare actual phones rather than GPU names
Both comparison entries list Mali-G57 MC2 graphics, but the cited material does not provide a controlled, same-device gaming test. Game performance and sustained speed also depend on handset cooling, software and power management. Use model-specific gaming tests if gaming is a deciding factor; do not infer a reliable winner from the shared GPU label or the unmatched NanoReview gaming averages.
How to assess the phone, not just the processor
The same chipset can be implemented differently across phones. Before choosing a handset, check the details that determine daily use:
- Network: Confirm the precise model and regional variant, supported LTE or 5G bands, and carrier compatibility.
- Memory and storage: Compare the phone’s actual RAM and storage capacity and type; platform support does not guarantee a manufacturer’s configuration.
- Cooling and sustained performance: Look for handset-level testing, especially if you play demanding games or run long workloads.
- Display, battery and camera hardware: Treat chipset maximums as capabilities, not promises about the phone’s panel, battery life, sensors or image quality.
- Software support, price and availability: Compare the specific phones sold in your market; these can matter more than a modest score difference.
As examples rather than a complete or globally current list, 91mobiles names the realme 15T and realme Narzo 90 with the Dimensity 6400 Max, and the Samsung Galaxy A07, F07, M07 4G, A18 4G and A08 4G with the Helio G99. Regional specifications and availability can change, so confirm the chipset on the exact product listing.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
