Modern computing environments increasingly combine x64 (x86-64) and Arm® 64-bit architectures. x64 remains central to desktops, laptops, servers, and enterprise infrastructure, while Arm-based processors are gaining ground in embedded systems, edge computing, data centres, and client devices as organisations prioritise performance-per-watt, thermal efficiency, and platform flexibility.
This shift is changing how hardware should be tested and diagnosed. The UEFI Forum describes UEFI as a standard environment for booting operating systems and running pre-boot applications. Pc-Check® UEFI uses that pre-boot environment to help validate hardware before the operating system, drivers, or deployed software images can influence results.
The Growing Role of Arm® 64-bit in Modern Computing
Arm® technology is no longer confined to mobile devices. Recent industry reporting and Arm’s own ecosystem updates point to wider adoption across cloud, edge, AI, and client computing, including growth in hyperscale server deployments and developer activity.
- Embedded and industrial systems (automation, manufacturing, transport)
- Edge computing gateways processing data closer to devices and sensors
- Rugged and specialist hardware used in field service environments
- Cloud infrastructure and data centres, where power efficiency matters
- Client computing devices, including laptops and compact PCs using Arm-based platforms such as Qualcomm® Snapdragon®
This growth is driven by Arm’s strengths in power efficiency, thermal performance, and system integration flexibility. It also introduces more variation in system design, because many Arm-based platforms are customised by manufacturers for a specific device, workload, or deployment environment.
As a result, two Arm-based devices with similar headline specifications can behave differently at firmware and hardware level.
x64 vs Arm: Two Architectures, Two Diagnostic Challenges
Although x64 and Arm systems both support modern operating systems and workloads, they differ significantly in how predictable they are at the platform level.
x64 platforms
x64 systems (from vendors such as Intel and AMD) typically offer:
- Highly standardised chipset and firmware expectations
- Mature, consistent driver ecosystems
- Well-established diagnostic behaviour across systems
This consistency makes x64 environments relatively straightforward to test—at least on the surface.
Arm 64-bit platforms
Arm systems are increasingly common, but they are also:
- Highly diverse in design and implementation
- Often tailored for specific devices or industries
- More dependent on firmware-level configuration
- Less uniform in how hardware is exposed at boot
This means diagnostics must account for variation not just in software, but in the way the platform itself is constructed.
Why Increasing Arm Adoption Raises Diagnostic Complexity
As Arm usage expands, the diagnostic challenge is no longer limited to a single architecture—it becomes a cross-platform consistency problem.
Without standardised testing, issues can arise such as:
- The same fault presenting differently on x64 and Arm systems
- Hardware issues being masked by OS-level drivers on one platform but not another
- Inconsistent interpretation of results across product lines
- Increased difficulty comparing devices in manufacturing or service workflows
The more Arm systems are introduced into mixed environments, the more important it becomes to remove software and driver influence from the diagnostic process.
The Risk of OS-Based Testing in Mixed x64 and Arm Environments
One of the biggest challenges in modern diagnostics is relying on tests that run after the operating system has loaded.
Once the OS is active, results can be influenced by:
- Device drivers that hide or reinterpret hardware behaviour
- Platform-specific configuration and tuning
- Software images that vary between deployments
- Different kernel-level handling between architectures
This can lead to false conclusions on both architectures, but it becomes especially problematic in Arm environments where firmware and hardware presentation vary more widely between systems.
The result is often:
- Misdiagnosed hardware failures
- Undetected intermittent faults
- Inconsistent service decisions
- Increased no-fault-found returns
Why Pre-Boot UEFI Testing Is Essential
Pc-Check® UEFI runs directly in the UEFI pre-boot environment, before any operating system is loaded. Because UEFI provides standard boot services and a defined firmware interface, pre-boot diagnostics can reduce the effect of operating system, driver, and deployment-image variables when testing hardware.
At this stage:
- The OS has not yet influenced hardware visibility
- Firmware-defined behaviour can be observed directly
- Hardware components can be tested in a more neutral state
- Results are more repeatable across platforms
This is particularly valuable as Arm adoption grows, because it helps standardise diagnostics across devices that may otherwise behave very differently once software layers are applied.
How Pc-Check UEFI Handles Both x64 and Arm Platforms
Pc-Check® UEFI is designed to support hardware-level validation across both x64 and Arm-based platforms, focusing on component behaviour before operating system behaviour becomes a factor.
Across both x64 and Arm systems, it can validate:
- CPU execution and stability at platform level
- Memory integrity under controlled test patterns
- Storage devices including NVMe and block storage
- USB, network, and input device functionality
- Firmware-exposed system configuration data
- Display and graphics output paths at basic hardware level
The key advantage is not just coverage. It is repeatability across architectures, giving service, manufacturing, and engineering teams a more consistent basis for comparing hardware behaviour on x64 and Arm-based systems.
Why This Matters as Arm® Adoption Expands
As Arm® processors move beyond niche or embedded roles into broader computing environments, organisations increasingly operate mixed-architecture fleets.
This includes:
- x64 servers in data centres
- Arm-based edge devices in industrial deployments
- Hybrid systems across manufacturing and logistics
- Specialist computing platforms in healthcare, retail, and transport
In these environments, inconsistent diagnostic methods create operational risk. A fault identified on one architecture may not be comparable to the same fault on another unless the testing method is standardised.
Pre-boot UEFI diagnostics help bridge this gap by providing a common testing layer independent of architecture.
What Happens Without Standardised Pre-Boot Testing
As Arm adoption increases, the absence of consistent diagnostics can lead to:
- Diverging test outcomes between x64 and Arm systems
- Increased misdiagnosis due to OS and driver influence
- Higher return rates caused by unclear fault attribution
- Slower triage in service and manufacturing workflows
- Reduced confidence in cross-platform comparisons
These issues become more likely as platform diversity increases and as teams need to compare results across different architectures, firmware implementations, and deployment models.
Summary
The rise of Arm® 64-bit is not replacing x64 overnight, but it is changing the diagnostic landscape. Organisations now need to support a broader mix of platforms across edge, cloud, industrial, embedded, and client computing environments.
In this mixed-architecture world, diagnostics must do more than detect faults. They must deliver consistent, repeatable results that teams can trust across different processors, firmware implementations, and deployment models.
By testing hardware in the UEFI pre-boot environment, Pc-Check® UEFI helps remove software-layer uncertainty and provides a common diagnostic foundation for both x64 and Arm-based systems.
For manufacturers, service teams, and engineering organisations, that means faster fault isolation, fewer ambiguous results, reduced service cost, and greater confidence as Arm® adoption continues to expand alongside established x64 infrastructure.
Sources: UEFI Forum, “Specifications and Tools” and “Specifications”; Arm, “The Arm Ecosystem: Powering AI Everywhere – From Cloud to Edge” and “Trademark Use Guidelines”; Reuters, “Arm estimates a 14-fold increase in data center customers since 2021, company says.”