ATI Mobility Radeon HD 4850 X2

The ATI Mobility Radeon HD 4850 X2 is a dual-GPU mobile solution from AMD, built on the TeraScale architecture and the M98 chip, fabricated on TSMC’s 55 nm process. Targeting high-end laptops of its era, this part integrates 956 million transistors across a 256 mm² die, yielding a transistor density of 3.7M / mm². With its production status marked as end-of-life and a release date of January 8, 2009, the data shows this GPU occupies the 50th percentile among all GPUs in the database, indicating a mid-pack standing in overall performance. The benchmark results for this card are derived from its architectural capabilities rather than a large suite of empirical scores, as the benchmark array is empty and the average score is zero.

How It Compares

The nearestRivals list is empty in the FACT PACK, so direct comparative data from the database is unavailable. However, the GPU’s 50th percentile ranking provides a reference point: it sits exactly at the median of all GPUs tracked, meaning half of the database entries perform better and half perform worse. This positioning suggests the HD 4850 X2 was a competent mobile performer in its day, but not a top-tier part. The predecessor is listed as M8x, and the successor as Manhattan, placing it within a specific lineage of AMD mobile graphics. Without rival scores or deltaPct values, any comparison must rely on the absolute specifications and the percentile context. The dual-chip design implies a performance scaling approach, but the lack of rival data prevents a nuanced breakdown of strengths or weaknesses relative to specific competitors. In practical terms, the 50th percentile places it above entry-level integrated solutions but below the flagship discrete cards of the same generation, based on the database’s overall distribution.

Ray Tracing and Feature Set

The HD 4850 X2 does not include dedicated ray tracing cores or tensor cores; these fields are null in the FACT PACK. This absence is consistent with the TeraScale architecture, which predates hardware-accelerated ray tracing by more than a decade. Instead, the GPU relies on traditional rasterization techniques. The API support reflects this era: DirectX 10.1 (feature level 10_1) and OpenGL 3.3 are the maximum supported graphics APIs. There is no Vulkan support listed, which further cements its legacy status. The shading units number 800, with 40 texture mapping units and 16 raster output units. These resources handle geometry and pixel processing, but the lack of RT cores means any ray-traced effects would be entirely software-based, which is impractical for real-time gaming. The feature set is therefore limited to conventional lighting, shadow mapping, and post-processing effects available under DirectX 10.1. For modern workloads requiring DirectX 12 or Vulkan, this GPU is incompatible. The display outputs are described as "Portable Device Dependent," meaning the connectors vary by laptop manufacturer, so users cannot assume standard ports. The bus interface is PCIe 2.0 x16, which provides adequate bandwidth for the GPU’s memory subsystem but is outdated relative to modern PCIe 4.0 or 5.0 slots.

Benchmark Performance

The FACT PACK lists no benchmark scores for the HD 4850 X2, and the average benchmark score is zero. The only quantitative performance indicator is the percentile rank of 50, which places it in the middle of the database’s GPU population. This percentile is not tied to a specific score, so it cannot be expressed as a deltaPct against rivals. The raw compute metrics provide a baseline: FP32 performance is 800.0 GFLOPS, pixel fill rate is 8.000 GPixel/s, and texture fill rate is 20.00 GTexel/s. These numbers indicate a GPU capable of handling 1080p gaming at medium to high settings in titles from its 2009 era, but not at high frame rates for demanding games. The FP32 figure of 800.0 GFLOPS is a single-precision throughput that, when compared to modern GPUs (which often exceed 10,000 GFLOPS), shows a vast generational gap. The pixel rate of 8.000 GPixel/s means the GPU can output 8 billion pixels per second, which is sufficient for a 1920x1080 resolution at roughly 3.8 frames per second if every pixel were fully shaded, but in practice, the fill rate combines with shader work. The texture rate of 20.00 GTexel/s supports high-resolution texture sampling, but again, this is low by modern standards. Without rival deltas, the analysis must conclude that the HD 4850 X2 delivers performance roughly equivalent to the median GPU in the database, which implies it could match or slightly exceed entry-level desktop cards from the same period, but it falls far short of any contemporary solution. The dual-GPU configuration does not double the effective memory bandwidth, as the 89.60 GB/s figure is shared, and the 800 shading units are split across two dies, which can lead to scaling inefficiencies in software.

FAQ

Q: Does the ATI Mobility Radeon HD 4850 X2 support hardware ray tracing?

A: No, the FACT PACK lists no ray tracing cores and no tensor cores; the architecture is TeraScale, which predates hardware ray tracing.

Q: What is the maximum DirectX version supported by this GPU?

A: The GPU supports DirectX 10.1 with feature level 10_1, as stated in the APIs field. It does not support DirectX 11 or later.

Q: How much video memory does the HD 4850 X2 have, and what type is it?

A: The memory size is 1024 MB, which is 1 GB, using GDDR5 type memory with a 256-bit bus width, providing a bandwidth of 89.60 GB/s.

Q: What is the process node and transistor count for this chip?

A: The chip is fabricated on a 55 nm process at TSMC, with 956 million transistors and a die size of 256 mm².

Q: Is this GPU suitable for modern gaming at high resolutions?

A: Given its 50th percentile ranking and legacy API support (DirectX 10.1, OpenGL 3.3), it is not suitable for modern titles; it was designed for games from its 2009 release period.

Q: What power connectors does the HD 4850 X2 require?

A: The FACT PACK lists power connectors as "None," and the slot width is an MXM Module, meaning it draws power through the mobile motherboard interface rather than external cables.

Who Should Consider It

The HD 4850 X2 targets users who need a mobile GPU for gaming on laptops from the late 2000s. Given its 50th percentile ranking, it is positioned for 720p or 1080p gaming at medium settings in titles that support DirectX 10.1. The 800.0 GFLOPS FP32 performance and 8.000 GPixel/s pixel rate suggest it can handle older games like Crysis or Call of Duty 4 at playable frame rates, provided the laptop’s cooling can manage the dual-chip heat. For users with legacy software or retro gaming collections, this GPU offers adequate performance, but it is not for anyone expecting modern features like ray tracing or high-refresh-rate 1440p gaming. The 1024 MB VRAM is a limitation for texture-heavy games, as 1 GB was standard at the time but is insufficient for today’s high-resolution assets. The 89.60 GB/s bandwidth is adequate for its era but bottlenecks on modern games. The display outputs being portable-device dependent means buyers must verify the laptop’s specific ports, which could include VGA, DVI, or HDMI depending on the OEM. This GPU is also relevant for collectors or those maintaining vintage systems, as its end-of-life status means no driver support for modern operating systems beyond legacy versions. The 50th percentile indicates it outperforms integrated graphics of its time, but it loses to discrete solutions from the same generation, making it a middle-ground choice for budget gaming laptops of 2009.

Power and Cooling

The FACT PACK does not list a TDP value for the HD 4850 X2, so thermal design power cannot be quantified. However, the dual-chip M98 configuration implies significant heat generation, requiring a robust cooling solution in the host laptop. The slot width is specified as "MXM Module," which is a standardized mobile PCIe form factor, but it does not indicate the number of cooling fans or heat pipes. Power connectors are listed as "None," meaning the GPU draws all its power from the MXM slot, which supplies up to 100W in some implementations, but the exact draw is unstated. There is no suggested PSU, as this is a mobile part and not relevant to desktop power supplies. The absence of a TDP in the FACT PACK prevents any wattage comparisons, but the 55 nm process and 956 million transistors suggest a moderate power envelope, likely in the range typical for high-end mobile GPUs of 2009. The memory clock is 700 MHz with 2.8 Gbps effective, which contributes to the power draw but is not broken out separately. For laptop users, the cooling system must be sufficient to maintain stable clocks under load; otherwise, thermal throttling could reduce performance below the theoretical 800.0 GFLOPS. The PCIe 2.0 x16 interface provides up to 75W of power, but the actual consumption may exceed that, requiring additional power phases on the motherboard. Since there are no external connectors, the laptop’s power delivery is the sole source, and any upgrade to this GPU would require a compatible MXM slot and appropriate thermal design.

Memory Subsystem

The HD 4850 X2 comes with 1024 MB of GDDR5 memory, which is 1 GB. The memory bus width is 256 bit, and the memory clock is 700 MHz, translating to 2.8 Gbps effective data rate. This yields a bandwidth of 89.60 GB/s. This bandwidth is a critical constraint for high resolutions: at 1080p, the GPU must fetch textures, geometry, and framebuffer data, and 89.60 GB/s is sufficient for 2009-era games but will cause stuttering or reduced texture quality in modern titles with large assets. The 256-bit bus is a mid-range width; high-end cards of the same period often used 512-bit buses, but this dual-GPU design shares the bus across two dies, meaning each GPU effectively gets half the bandwidth for its portion of the workload. This sharing can lead to micro-stuttering in poorly optimized games. The GDDR5 type offers higher bandwidth per pin compared to GDDR3, but the 1024 MB capacity is limited; games from 2009 typically used 512 MB to 1 GB, so this was adequate then, but today’s titles often require 6-8 GB. The pixel rate of 8.000 GPixel/s and texture rate of 20.00 GTexel/s are tied to the memory bandwidth: higher resolutions demand more pixel throughput, and this GPU can handle 1080p at moderate settings, but 1440p or 4K would exceed its fill rate capabilities. The 800 shading units are spread across two GPUs, so the effective per-GPU shader count is 400, which is low for complex shaders. For users planning to run high-resolution displays, the data indicates that performance will degrade significantly beyond 1080p, and the 89.60 GB/s bandwidth becomes a bottleneck. The memory subsystem is a balanced design for its time, but it is a limiting factor for any modern use case.