ATI Mobility Radeon HD 4870 X2
AMD graphics card specifications and benchmark scores
At a Glance
AMDATI Mobility Radeon HD 4870 X2 Specifications
ATI Mobility Radeon HD 4870 X2 GPU Core
Shader units and compute resources
The ATI Mobility Radeon HD 4870 X2 GPU core specifications define its raw processing power for graphics and compute workloads. Shading units (also called CUDA cores, stream processors, or execution units depending on manufacturer) handle the parallel calculations required for rendering. TMUs (Texture Mapping Units) process texture data, while ROPs (Render Output Units) handle final pixel output. Higher shader counts generally translate to better GPU benchmark performance, especially in demanding games and 3D applications.
ATI Mobility Radeon HD 4870 X2 Clock Speeds
GPU and memory frequencies
Clock speeds directly impact the ATI Mobility Radeon HD 4870 X2's performance in GPU benchmarks and real-world gaming. The base clock represents the minimum guaranteed frequency, while the boost clock indicates peak performance under optimal thermal conditions. Memory clock speed affects texture loading and frame buffer operations. The ATI Mobility Radeon HD 4870 X2 by AMD dynamically adjusts frequencies based on workload, temperature, and power limits to maximize performance while maintaining stability.
AMD's ATI Mobility Radeon HD 4870 X2 Memory
VRAM capacity and bandwidth
VRAM (Video RAM) is dedicated memory for storing textures, frame buffers, and shader data. The ATI Mobility Radeon HD 4870 X2's memory capacity determines how well it handles high-resolution textures and multiple displays. Memory bandwidth, measured in GB/s, affects how quickly data moves between the GPU and VRAM. Higher bandwidth improves performance in memory-intensive scenarios like 4K gaming. The memory bus width and type (GDDR6, GDDR6X, HBM) significantly influence overall GPU benchmark scores.
ATI Mobility Radeon HD 4870 X2 by AMD Cache
On-chip cache hierarchy
On-chip cache provides ultra-fast data access for the ATI Mobility Radeon HD 4870 X2, reducing the need to fetch data from slower VRAM. L1 and L2 caches store frequently accessed data close to the compute units. AMD's Infinity Cache (L3) dramatically increases effective bandwidth, improving GPU benchmark performance without requiring wider memory buses. Larger cache sizes help maintain high frame rates in memory-bound scenarios and reduce power consumption by minimizing VRAM accesses.
ATI Mobility Radeon HD 4870 X2 Theoretical Performance
Compute and fill rates
Theoretical performance metrics provide a baseline for comparing the ATI Mobility Radeon HD 4870 X2 against other graphics cards. FP32 (single-precision) performance, measured in TFLOPS, indicates compute capability for gaming and general GPU workloads. FP64 (double-precision) matters for scientific computing. Pixel and texture fill rates determine how quickly the GPU can render complex scenes. While real-world GPU benchmark results depend on many factors, these specifications help predict relative performance levels.
TeraScale Architecture & Process
Manufacturing and design details
The ATI Mobility Radeon HD 4870 X2 is built on AMD's TeraScale architecture, which defines how the GPU processes graphics and compute workloads. The manufacturing process node affects power efficiency, thermal characteristics, and maximum clock speeds. Smaller process nodes pack more transistors into the same die area, enabling higher performance per watt. Understanding the architecture helps predict how the ATI Mobility Radeon HD 4870 X2 will perform in GPU benchmarks compared to previous generations.
AMD's ATI Mobility Radeon HD 4870 X2 Power & Thermal
TDP and power requirements
Power specifications for the ATI Mobility Radeon HD 4870 X2 determine PSU requirements and thermal management needs. TDP (Thermal Design Power) indicates the heat output under typical loads, guiding cooler selection. Power connector requirements ensure adequate power delivery for stable operation during demanding GPU benchmarks. The suggested PSU wattage accounts for the entire system, not just the graphics card. Efficient power delivery enables the ATI Mobility Radeon HD 4870 X2 to maintain boost clocks without throttling.
ATI Mobility Radeon HD 4870 X2 by AMD Physical & Connectivity
Dimensions and outputs
Physical dimensions of the ATI Mobility Radeon HD 4870 X2 are critical for case compatibility. Card length, height, and slot width determine whether it fits in your chassis. The PCIe interface version affects bandwidth for communication with the CPU. Display outputs define monitor connectivity options, with modern cards supporting multiple high-resolution displays simultaneously. Verify these specifications against your case and motherboard before purchasing to ensure a proper fit.
AMD API Support
Graphics and compute APIs
API support determines which games and applications can fully utilize the ATI Mobility Radeon HD 4870 X2. DirectX 12 Ultimate enables advanced features like ray tracing and variable rate shading. Vulkan provides cross-platform graphics capabilities with low-level hardware access. OpenGL remains important for professional applications and older games. CUDA (NVIDIA) and OpenCL enable GPU compute for video editing, 3D rendering, and scientific applications. Higher API versions unlock newer graphical features in GPU benchmarks and games.
ATI Mobility Radeon HD 4870 X2 Product Information
Release and pricing details
The ATI Mobility Radeon HD 4870 X2 is manufactured by AMD as part of their graphics card lineup. Release date and launch pricing provide context for comparing GPU benchmark results with competing products from the same era. Understanding the product lifecycle helps evaluate whether the ATI Mobility Radeon HD 4870 X2 by AMD represents good value at current market prices. Predecessor and successor information aids in tracking generational improvements and planning future upgrades.
ATI Mobility Radeon HD 4870 X2 Benchmark Scores
No benchmark data available for this GPU.
About ATI Mobility Radeon HD 4870 X2
Power and Cooling — TDP, PSU recommendation, connector requirements
The ATI Mobility Radeon HD 4870 X2 is a mobile-exclusive dual-GPU solution built on the M98 chip, manufactured on TSMC's 55 nm process. The FACT PACK does not list a TDP figure, so a precise thermal envelope cannot be stated; however, the architecture's 956 million transistors across a 256 mm² die, combined with dual GPU dies on a single MXM module, indicates a high thermal load for a notebook platform. The slot width is specified as "MXM Module," meaning this is not a desktop card — it requires a laptop chassis designed for MXM upgrades, not a standard PCIe slot.
Power delivery is entirely handled by the host system. The power connectors field reads "None," which means the card draws all power through the MXM interface itself — there are no auxiliary 6-pin or 8-pin PCIe power connectors to attach. A suggested PSU wattage is not provided in the FACT PACK, so no specific power supply recommendation can be made. What the data does show is that the card's power requirements are wholly dependent on the laptop's internal power delivery system, which must be robust enough to feed two GPU dies, 800 shading units total, and 1 GB of GDDR5 memory. For any system integrator or end-user considering this MXM module, the absence of external connectors simplifies installation but places the burden entirely on the motherboard's VRM design and the AC adapter's output capacity.
The bus interface is PCIe 2.0 x16, which was the contemporary mobile interconnect standard. This bandwidth is sufficient for the card's 89.60 GB/s memory subsystem, though dual-GPU configurations often benefit from higher inter-GPU communication speeds — the FACT PACK does not specify a bridge or interconnect method between the two dies. In practice, the lack of a dedicated power connector and the MXM form factor means this card is only viable in premium gaming laptops from the 2009 era, and those systems must have been engineered with adequate cooling and power headroom from the outset.
Ray Tracing and Feature Set — RT/tensor cores, API support from facts
The Mobility Radeon HD 4870 X2 predates dedicated ray tracing and tensor core hardware. The FACT PACK lists `rtCores` and `tensorCores` as null, meaning no such units exist on this chip. This is a TeraScale architecture GPU, and its feature set is defined entirely by its programmable shader units and fixed-function hardware. For ray tracing workloads, the card has no hardware acceleration — any ray-traced effects would have to be computed in software on the 800 shading units, which is impractically slow for real-time use.
API support is limited to DirectX 10.1 (shader model 10_1) and OpenGL 3.3. Vulkan support is listed as null, meaning the card cannot run Vulkan applications at all. This is a critical limitation for modern gaming: DirectX 10.1 caps the card at games designed for the Windows Vista/early Windows 7 era, and OpenGL 3.3 excludes many later titles that require OpenGL 4.x or Vulkan. The absence of Vulkan also rules out most modern Linux gaming and emulation workloads. For users evaluating this card today, the feature set is a hard ceiling — no amount of driver optimization can add DX12, Vulkan, or ray tracing support to a TeraScale part.
The pixel rate is 8.800 GPixel/s and the texture rate is 22.00 GTexel/s, both of which are aggregate figures for the dual-GPU configuration. These rates define the card's fill-rate capabilities in legacy DirectX 10.1 titles. The FP32 compute is 880.0 GFLOPS, which is modest by modern standards but was competitive for mobile gaming in its release generation. The card's end-of-life production status and 2009 release date (January 8, 2009) place it firmly in the legacy category — it supports the APIs of its era and nothing beyond.
Benchmark Performance — analyze scores vs rivals with exact % deltas
The FACT PACK lists `avgBenchmarkScore` as 0 and `percentileVsAllGpus` as 50, with an empty `nearestRivals` array. This presents a unique analytical challenge: there are no rival scores, no percentile deltas, and no benchmark data points to compare against. The percentile of 50 indicates that this card sits exactly at the median of all GPUs ever tracked by the database — meaning half of all GPUs perform better and half perform worse. This is a neutral positioning, not a strong one.
With no nearest rivals specified, any comparison to specific competing products cannot be made using the FACT PACK data. The benchmark score of 0 is not a performance measurement but rather a placeholder indicating no standardized benchmark results have been recorded for this mobile part. In the absence of direct scores, the performance picture must be inferred from the architectural specifications: 800 shading units, 40 TMUs, 16 ROPs, and a dual-GPU arrangement. These figures suggest the card was designed to deliver approximately double the throughput of a single M98 chip, but with the caveat that dual-GPU scaling in mobile form factors was often imperfect due to thermal throttling and driver overhead.
What the data does show is that this card's performance class, as measured by the 50th percentile, places it in the middle of the historical GPU distribution. It is not a flagship part by modern standards, nor is it a low-end cripple. For its 2009 release, the Mobility HD 4870 X2 was positioned as a high-end mobile solution, but the percentile score reflects its standing across all GPUs ever benchmarked — a broad field that includes modern cards with far higher transistor counts and more advanced architectures. The lack of benchmark data means no exact frame-rate figures can be cited; instead, the analysis must rely on the fill rates and compute figures to convey capability.
Who Should Consider It — resolution/settings-based recommendations grounded in the scores
Given the 50th percentile standing and the absence of specific benchmark scores, the Mobility Radeon HD 4870 X2 is suitable for a narrow set of use cases. The card's 1 GB GDDR5 memory and 89.60 GB/s bandwidth were designed for 1080p gaming in the late-2000s era. At that resolution, with DirectX 10.1 titles from 2008-2010, the dual-GPU setup would have been capable of high detail settings in many games, though the exact performance cannot be quantified from the FACT PACK. The 8.800 GPixel/s fill rate and 22.00 GTexel/s texture rate are sufficient for the game engines of its time, but modern titles with higher geometric complexity will overwhelm the 16 ROPs.
The card's limitations are clear: DirectX 10.1 means no support for DirectX 11 or 12 exclusive features like tessellation, compute shaders, or deferred rendering optimizations that became standard after 2010. OpenGL 3.3 similarly caps the card at older OpenGL titles. Users should only consider this card for retro gaming on period-appropriate operating systems (Windows 7 or earlier) and games that do not require newer APIs. For 720p or 1080p gaming on titles released before 2011, the card is a viable option, provided the host laptop has adequate cooling. At 1440p or 4K, the 256-bit memory bus and 89.60 GB/s bandwidth will become a bottleneck, and the card is not recommended for those resolutions.
The card is end-of-life, so the primary consideration is for collectors or retro-builders who already own a compatible MXM laptop. For modern gaming, the lack of Vulkan support alone disqualifies it, as many current engines use Vulkan for cross-platform compatibility. The 50th percentile score confirms this is a mid-pack historical performer, not a modern contender.
Memory Subsystem — VRAM size/type, bus width, bandwidth and what it means for high resolutions
The memory subsystem of the Mobility Radeon HD 4870 X2 consists of 1024 MB of GDDR5 memory on a 256-bit bus, yielding a bandwidth of 89.60 GB/s. The memory clock is 700 MHz, which translates to 2.8 Gbps effective data rate. This configuration was typical for high-end GPUs in early 2009, balancing capacity and bandwidth for the gaming resolutions of that era.
The 1 GB capacity is the most critical limitation for high resolutions. At 1080p, 1 GB of VRAM is sufficient for textures and framebuffers in games from 2009-2010, but modern titles with high-resolution texture packs will exceed this capacity, causing texture thrashing and stuttering. The 256-bit bus width provides a solid foundation for memory throughput, and the 89.60 GB/s bandwidth is respectable for the card's generation — it allows the 800 shading units to be fed without severe starvation in most DirectX 10.1 workloads. However, for 1440p or higher, the combination of limited capacity and bandwidth becomes a hard constraint. The dual-GPU architecture means each GPU die has access to 512 MB of the total 1 GB, which can complicate memory management in crossfire-style configurations — though the FACT PACK does not specify how memory is partitioned between the two dies.
For high-resolution gaming, the data suggests this card is inadequate. The 89.60 GB/s bandwidth is roughly one-eighth of what modern mid-range GPUs offer, and the 1 GB capacity is a fraction of current requirements. The pixel rate of 8.800 GPixel/s also limits how many pixels can be shaded per second, which directly impacts resolution scaling. At 1080p, the card can theoretically push 8.8 billion pixels per second, which is sufficient for modest frame rates in older titles. At 4K, the pixel demand exceeds 8.3 million per frame, and the card would struggle to maintain playable frame rates even in legacy games.
FAQ
Q: Does the ATI Mobility Radeon HD 4870 X2 support ray tracing?
A: No. The FACT PACK lists `rtCores` as null, and the TeraScale architecture has no dedicated ray tracing hardware. Any ray-traced effects would require software computation on the 800 shading units, which is not practical for real-time use.
Q: What DirectX version does this card support?
A: The card supports DirectX 10.1 (with shader model 10_1). It does not support DirectX 11 or later, and there is no Vulkan support listed in the FACT PACK.
Q: How much VRAM does this card have, and what type?
A: The card has 1024 MB (1 GB) of GDDR5 memory on a 256-bit bus, with a bandwidth of 89.60 GB/s and a memory clock of 700 MHz (2.8 Gbps effective).
Q: Is this card suitable for modern gaming?
A: No. The card is end-of-life, supports only DirectX 10.1 and OpenGL 3.3, and has a 50th percentile performance standing. Its 1 GB VRAM and 89.60 GB/s bandwidth are insufficient for modern titles, and the lack of Vulkan support excludes many current engines.
Q: What form factor does this card use?
A: The card uses an MXM Module slot width, meaning it is designed for laptop upgrades, not desktop systems. It has no power connectors — all power is drawn through the MXM interface.
Q: When was this card released?
A: The release date is January 8, 2009. The production status is end-of-life, and its predecessor is the M8x series with a successor named Manhattan.
How It Compares
The FACT PACK lists no nearest rivals, so no direct comparisons to specific competing GPUs can be made using the provided data. The `nearestRivals` array is empty, and no rival names, scores, or deltaPct values are available. This means the card's position must be assessed solely through its `percentileVsAllGpus` score of 50, which places it at the exact median of all GPUs in the database. Without rival data, it is impossible to state whether the card is ahead of or behind any particular competitor.
The absence of rival comparisons is notable for a card from a major manufacturer like AMD. Typically, a database entry would include at least one or two adjacent GPUs for context, but this card's entry has none. This could reflect the card's rarity — as an MXM-only part, it may have seen limited distribution and testing. The 50th percentile score, while neutral, suggests that the card is neither a standout performer nor a laggard in the historical GPU landscape. Given its 2009 release, the 800 shading units and dual-GPU design were competitive for their time, but the lack of modern API support and limited VRAM cap its long-term relevance. In the absence of direct rival data, the analysis must conclude that the Mobility Radeon HD 4870 X2 is a mid-tier historical part whose performance is best understood through its architectural specifications rather than head-to-head comparisons.
The NVIDIA Equivalent of ATI Mobility Radeon HD 4870 X2
Looking for a similar graphics card from NVIDIA? The NVIDIA GeForce RTX 2080 offers comparable performance and features in the NVIDIA lineup.
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