AMD Radeon HD 7950 vs NVIDIA GeForce RTX 4090 Mobile Comparison

The Verdict

The recorded data presents a clear generational divide. The NVIDIA GeForce RTX 4090 Mobile is an active, modern flagship mobile part, while the AMD Radeon HD 7950 is an end-of-life desktop card from a different era. The RTX 4090 Mobile sits at the 84th percentile of all GPUs in the database, with an average benchmark score of 43,667. The HD 7950 sits at the 78th percentile, with an average score of 33,951. The RTX 4090 Mobile leads by roughly 28.6% in average benchmark score, a substantial margin that reflects the architectural and process node advantages it holds.

For users seeking maximum performance in a portable form factor, the RTX 4090 Mobile is the clear choice from the data. Its benchmark scores across multiple APIs, including Geekbench OpenCL at 180,831 and Vulkan at 170,774, far exceed anything recorded for the HD 7950, which only has a Geekbench Metal score of 33,951. The HD 7950, by contrast, belongs to a legacy segment; its 78th percentile ranking and 200 W power draw make it a less efficient option for modern workloads. The data suggests the RTX 4090 Mobile is for those who prioritize raw compute and modern API support, while the HD 7950 is only relevant for legacy system builders or those working within older software ecosystems.

Architecture Differences

The two GPUs come from fundamentally different architectural lineages. The RTX 4090 Mobile uses the AD103 chip built on the Ada Lovelace architecture, manufactured on a 5 nm process at TSMC. It packs 45,900 million transistors on a 379 mm² die, yielding a transistor density of 121.1 million per mm². The HD 7950 uses the Tahiti chip based on GCN 1.0 architecture, built on a 28 nm process, also at TSMC. It holds 4,313 million transistors on a 352 mm² die, with a density of just 12.3 million per mm². The density difference, roughly 10x, explains much of the performance gap.

The RTX 4090 Mobile features 9,728 shading units, 304 texture mapping units, and 112 raster operation units. It also includes 76 ray tracing cores and 304 tensor cores, enabling hardware-accelerated ray tracing and AI workloads. The HD 7950 has 1,792 shading units, 112 TMUs, and 32 ROPs, with no ray tracing or tensor core equivalents. The memory subsystems also diverge sharply. The RTX 4090 Mobile uses 16 GB of GDDR6 on a 256-bit bus, delivering 576.0 GB/s of bandwidth. The HD 7950 uses 3 GB of GDDR5 on a 384-bit bus, delivering 240.0 GB/s. Despite the narrower bus, the newer memory standard and higher effective speed give the RTX 4090 Mobile more than double the bandwidth.

Feature support reflects the age gap. The RTX 4090 Mobile supports DirectX 12 Ultimate (12_2), OpenGL 4.6, and Vulkan 1.4. The HD 7950 supports DirectX 12 (11_1), OpenGL 4.6, and Vulkan 1.2.170. The RTX 4090 Mobile also uses PCIe 4.0 x16, while the HD 7950 uses PCIe 3.0 x16. The power profiles are starkly different: the RTX 4090 Mobile is rated at 120 W and is an integrated graphics package (IGP) with no power connectors, while the HD 7950 is a dual-slot card drawing 200 W and requiring two 6-pin power connectors plus a 550 W suggested PSU.

FAQ

Q: Which GPU has a higher average benchmark score?

A: The NVIDIA GeForce RTX 4090 Mobile has an average benchmark score of 43,667, compared to the AMD Radeon HD 7950's 33,951. The RTX 4090 Mobile is roughly 28.6% ahead.

Q: Does the RTX 4090 Mobile support ray tracing?

A: Yes. The RTX 4090 Mobile includes 76 ray tracing cores and 304 tensor cores, part of its Ada Lovelace architecture. The HD 7950 has no ray tracing or tensor core hardware.

Q: What is the memory bandwidth difference?

A: The RTX 4090 Mobile delivers 576.0 GB/s over a 256-bit bus with 16 GB of GDDR6. The HD 7950 delivers 240.0 GB/s over a 384-bit bus with 3 GB of GDDR5.

Q: Which card draws less power?

A: The RTX 4090 Mobile is rated at 120 W and requires no external power connectors. The HD 7950 is rated at 200 W and needs two 6-pin power connectors.

Q: What modern APIs does each GPU support?

A: The RTX 4090 Mobile supports DirectX 12 Ultimate (12_2) and Vulkan 1.4. The HD 7950 supports DirectX 12 (11_1) and Vulkan 1.2.170. Both support OpenGL 4.6.

Q: How do their production statuses compare?

A: The RTX 4090 Mobile is listed as Active, with a release date in early 2023. The HD 7950 is End-of-life, with a release date in early 2012.

Specification Differences

The two cards differ across nearly every major specification. The RTX 4090 Mobile uses a 5 nm process; the HD 7950 uses 28 nm. The RTX 4090 Mobile has 45,900 million transistors versus 4,313 million. Die size is similar at 379 mm² versus 352 mm², but density is 121.1M per mm² versus 12.3M per mm². Shading units are 9,728 versus 1,792. TMUs are 304 versus 112. ROPs are 112 versus 32. The RTX 4090 Mobile has 76 RT cores and 304 tensor cores; the HD 7950 has none.

Memory size is 16 GB versus 3 GB. Memory type is GDDR6 versus GDDR5. Bus width is 256-bit versus 384-bit. Bandwidth is 576.0 GB/s versus 240.0 GB/s. The RTX 4090 Mobile has a base clock of 1335 MHz and boost of 1695 MHz, while the HD 7950 has no recorded base or boost clocks. Memory clock is 2250 MHz (18 Gbps effective) versus 1250 MHz (5 Gbps effective). Pixel rate is 189.8 GPixel/s versus 25.60 GPixel/s. Texture rate is 515.3 GTexel/s versus 89.60 GTexel/s. FP32 compute is 32.98 TFLOPS versus 2.867 TFLOPS. The RTX 4090 Mobile also supports FP16 at 32.98 TFLOPS (1:1), while the HD 7950 has no recorded FP16 capability.

Power draw is 120 W versus 200 W. The RTX 4090 Mobile is an IGP with no slot width or power connectors, while the HD 7950 is dual-slot, 278 mm long, and uses two 6-pin connectors. The HD 7950 has a suggested PSU of 550 W; the RTX 4090 Mobile has none listed. Bus interface is PCIe 4.0 x16 versus PCIe 3.0 x16. Display outputs are portable-device dependent for the RTX 4090 Mobile, versus 1x DVI, 1x HDMI 1.4a, and 2x mini-DisplayPort 1.2 for the HD 7950.

Head-to-Head Benchmarks

The database contains no shared benchmark tests between the two GPUs, so direct side-by-side scores are unavailable. However, the recorded individual benchmarks provide a basis for comparison. The RTX 4090 Mobile scores 180,831 in Geekbench OpenCL and 170,774 in Geekbench Vulkan. The HD 7950 scores 33,951 in Geekbench Metal. Even accounting for different API tests, the RTX 4090 Mobile's compute scores are over five times higher in absolute terms.

In the Passmark suite, the RTX 4090 Mobile shows a wide spread across API versions: DirectX 9 at 310, DirectX 10 at 173, DirectX 11 at 262, and DirectX 12 at 107. Its G3D score is 27,212, and its GPU compute score is 12,347. The G2D score is 984. The HD 7950 has no Passmark entries in the database, so no direct comparison is possible. The RTX 4090 Mobile's nearest rivals in the database are the NVIDIA Quadro M6000 (average 43,301, 0.8% lower), the GeForce RTX 5050 Mobile (43,268, 0.9% lower), and the Quadro M6000 24 GB (43,262, 0.9% lower), with the RTX A6000 (44,075) sitting 0.9% higher. This places the RTX 4090 Mobile in a tight cluster of high-end workstation and mobile parts.

The HD 7950's nearest rivals include the AMD Radeon RX 480 (33,997, 0.1% higher), the RX 7700S (33,849, 0.3% lower), the RX 560 XT (34,133, 0.5% higher), and the RTX A2000 12 GB (34,154, 0.6% higher). These deltas are all within 0.6%, indicating the HD 7950 sits at a performance plateau shared by several mid-range cards. The RTX 4090 Mobile's percentile rank of 84 versus the HD 7950's 78 further illustrates the gap, though both sit in the upper range of the database.

Where Each One Wins

The RTX 4090 Mobile wins decisively in raw compute, memory bandwidth, and modern feature support. Its 32.98 TFLOPS of FP32 performance is more than eleven times the HD 7950's 2.867 TFLOPS. Its 576.0 GB/s bandwidth is 2.4 times the HD 7950's 240.0 GB/s. The presence of 76 RT cores and 304 tensor cores makes it suitable for ray-traced rendering and AI-accelerated tasks, capabilities entirely absent from the HD 7950. The RTX 4090 Mobile also wins on efficiency, delivering far higher performance within a 120 W envelope versus 200 W. Its 5 nm process node and Ada Lovelace architecture support DirectX 12 Ultimate and Vulkan 1.4, making it future-proof for current and upcoming titles.

The HD 7950, despite its age, retains advantages in a few narrow areas. Its 384-bit memory bus is wider than the RTX 4090 Mobile's 256-bit bus, though the bandwidth is still lower. Its 3 GB frame buffer is smaller, but for legacy 1080p workloads on older APIs, it may suffice. The HD 7950 supports OpenGL 4.6, matching the RTX 4090 Mobile, and its GCN 1.0 architecture has a long history of driver maturity in older DirectX titles. It is also a desktop card with fixed display outputs, including dual mini-DisplayPort 1.2, which may appeal to users with legacy monitors. Its release in early 2012 and end-of-life status, however, mean it has no path forward for modern workloads.

For users deciding between the two, the data is unambiguous. The RTX 4090 Mobile is for those who need top-tier mobile compute, ray tracing, AI features, and high bandwidth in a portable package. The HD 7950 is for those maintaining legacy desktop systems where modern API support is irrelevant and power draw is not a concern. The RTX 4090 Mobile's average benchmark score of 43,667 versus 33,951, combined with its 84th versus 78th percentile ranking, confirms it as the superior part in nearly every measurable category.