Apple’s latest in-house cellular modem, the C1X, is turning into a much bigger threat to Qualcomm than many expected. New speedtest results from Ookla show Apple has closed most of the real-world performance gap with Qualcomm’s X80 modem—while delivering a major jump over Apple’s first-generation C1.
The C1X is Apple’s second custom modem after the C1, and Apple says it can be up to twice as fast as the previous model. Even with that speed boost, there’s an important limitation to keep in mind: C1X supports sub-6GHz 5G (low-band and mid-band) but still does not include mmWave 5G support. In other words, it’s built to perform best on the 5G spectrum most people actually use day to day, rather than the extremely high-frequency mmWave deployments that exist in select areas.
Apple is also positioning the C1X as a “smarter” modem, not just a faster one. The company says it can adapt to network congestion by prioritizing certain download tasks when a network becomes a bottleneck. It also plays a role in Apple’s “Limit Precise Location” feature, which reduces how much location information is exposed to carriers by shifting visibility from street-level precision to a broader neighborhood-level view.
Where Apple is pushing especially hard is efficiency. According to Apple, the C1X delivers up to 30% lower modem energy usage compared to an iPad Air with M3—an improvement that can translate into better battery life during 5G use, hotspot sessions, and other data-heavy scenarios.
Ookla’s dataset focuses on median network conditions, which is often the best representation of what users experience during normal, everyday phone use. In the United States, devices using the C1X reached a median 5G download speed of 352.21 Mbps. That places it just 2.65% behind Qualcomm’s X80 in the same comparison, but a massive 69.41% ahead of Apple’s earlier C1 modem.
That’s a notable shift: Apple’s custom modem effort is no longer simply “good for a first try.” In typical US conditions, it’s operating close enough to Qualcomm’s best that most users would struggle to notice a difference in day-to-day browsing, streaming, and downloads.
C1X can even edge ahead under congestion in the US
One of the more interesting takeaways from Ookla’s testing is the C1X behavior in bottleneck conditions. In the United States, the C1X actually posted download speeds about 7% higher than the X80 when the network is congested. If Apple’s congestion-management claims are accurate, this is exactly where that kind of prioritization and adaptation would show real value—not in ideal lab conditions, but in crowded networks where performance usually falls apart.
Where the performance gap is smallest—and where Qualcomm still leads by more
Across the markets tested, the closest race between C1X and X80 (smallest download-speed difference) appears in Italy, Spain, Germany, Saudi Arabia, the United States, and France. In these regions, Apple’s modem is essentially “right there,” delivering competitive 5G speeds under average conditions.
On the other hand, Qualcomm’s X80 shows a larger lead in Taiwan, Poland, South Korea, India, Malaysia, and Brazil. Ookla also points out that in challenging network conditions, C1X generally stays in the same performance neighborhood as the X80—except in a few markets including Taiwan, South Korea, the UAE, and Saudi Arabia, where Qualcomm benefits more from advanced 5G network deployments and can leverage those networks more effectively.
There are also countries where the C1X doesn’t appear to move the needle much compared to the older C1. According to Ookla, the C1X showed no meaningful improvement over C1 in Brazil, India, and Malaysia. The likely explanation is network reality, not necessarily modem capability: these markets may face heavier congestion, or rely more on low-band Dynamic Spectrum Sharing (DSS) instead of dedicated mid-band 5G—conditions that can flatten the advantages of a newer, more capable modem.
Upload speeds: a more consistent experience in many markets
Ookla describes the C1X as delivering a more equitable upload experience compared to the iPhone 17 Pro Max with the X80, with most markets staying within a +/- 5 Mbps range. A few exceptions stood out, including Taiwan (-8.6 Mbps), Malaysia (+5.6 Mbps), India (-5.2 Mbps), Poland (-7.3 Mbps), and the UAE (-9.2 Mbps). For users, upload consistency matters for video calls, cloud backups, sharing content, and livestreaming—areas where stable performance can be more important than peak speed.
Latency is where C1X makes its strongest argument
Perhaps the biggest “quiet win” for Apple is latency. Ookla reports a clear C1X advantage in responsiveness versus both the older C1 and, in most markets, the X80 as well. That’s increasingly important as phones are used more for cloud-driven workloads, real-time services, and emerging on-device and cloud-based AI features where responsiveness can directly impact the experience.
Ookla notes that C1X improves responsiveness over C1, with particularly noticeable gains in China (+6 ms), Indonesia (+6 ms), and the United States (+5 ms). It also improves latency versus the iPhone 17 Pro Max with X80 across the vast majority of markets, with Taiwan and Japan being the notable exceptions.
Bottom line: Apple’s modem strategy is no longer “mid-tier”
Taken together, these results suggest Apple’s C1X isn’t a compromised or mid-range alternative. Under strong network conditions, Qualcomm still holds an advantage—likely tied to deeper experience optimizing across complex multi-band 5G environments and a broader history of global field testing. But Apple is now striking distance in median download performance, can compete strongly when networks are congested (at least in the US), and appears to lead in latency, a metric that’s becoming more important every year.
For consumers, the takeaway is simple: Apple’s second-generation modem is shaping up as a genuinely competitive 5G solution, especially in mid-band, congestion-free sub-6GHz environments where most people spend the majority of their time.
