H100 CNX vs Radeon RX 7990 XTX

Primary details

GPU architecture, market segment, value for money and other general parameters compared.

Place in the rankingnot ratednot rated
Place by popularitynot in top-100not in top-100
ArchitectureRDNA 3.0 (2022−2024)Hopper (2022−2023)
GPU code nameNavi 31GH100
Market segmentDesktopWorkstation
Release date2023 (1 year ago)21 March 2023 (1 year ago)

Detailed specifications

General parameters such as number of shaders, GPU core base clock and boost clock speeds, manufacturing process, texturing and calculation speed. Note that power consumption of some graphics cards can well exceed their nominal TDP, especially when overclocked.

Pipelines / CUDA cores614414592
Core clock speed2500 MHz690 MHz
Boost clock speed3599 MHz1845 MHz
Number of transistors57,700 million80,000 million
Manufacturing process technology5 nm4 nm
Power consumption (TDP)405 Watt350 Watt
Texture fill rate1,382841.3
Floating-point processing power88.45 TFLOPS53.84 TFLOPS
ROPs19224
TMUs384456
Tensor Coresno data456
Ray Tracing Cores96no data

Form factor & compatibility

Information on compatibility with other computer components. Useful when choosing a future computer configuration or upgrading an existing one. For desktop graphics cards it's interface and bus (motherboard compatibility), additional power connectors (power supply compatibility).

InterfacePCIe 4.0 x16PCIe 5.0 x16
Length287 mm267 mm
Width3-slot2-slot
Supplementary power connectors3x 8-pin8-pin EPS

VRAM capacity and type

Parameters of VRAM installed: its type, size, bus, clock and resulting bandwidth. Integrated GPUs have no dedicated video RAM and use a shared part of system RAM.

Memory typeGDDR6HBM2e
Maximum RAM amount24 GB80 GB
Memory bus width384 Bit5120 Bit
Memory clock speed3000 MHz1593 MHz
Memory bandwidth1.15 TB/s2,039 GB/s

Connectivity and outputs

Types and number of video connectors present on the reviewed GPUs. As a rule, data in this section is precise only for desktop reference ones (so-called Founders Edition for NVIDIA chips). OEM manufacturers may change the number and type of output ports, while for notebook cards availability of certain video outputs ports depends on the laptop model rather than on the card itself.

Display Connectors1x HDMI 2.1a, 2x DisplayPort 2.1, 1x USB Type-CNo outputs
HDMI+-

API compatibility

List of supported 3D and general-purpose computing APIs, including their specific versions.

DirectX12 Ultimate (12_2)N/A
Shader Model6.7N/A
OpenGL4.6N/A
OpenCL2.23.0
Vulkan1.3N/A
CUDA-9.0

Pros & cons summary


Maximum RAM amount 24 GB 80 GB
Chip lithography 5 nm 4 nm
Power consumption (TDP) 405 Watt 350 Watt

H100 CNX has a 233.3% higher maximum VRAM amount, a 25% more advanced lithography process, and 15.7% lower power consumption.

We couldn't decide between Radeon RX 7990 XTX and H100 CNX. We've got no test results to judge.

Be aware that Radeon RX 7990 XTX is a desktop card while H100 CNX is a workstation one.


Should you still have questions concerning choice between the reviewed GPUs, ask them in Comments section, and we shall answer.

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AMD Radeon RX 7990 XTX
Radeon RX 7990 XTX
NVIDIA H100 CNX
H100 CNX

Comparisons with similar GPUs

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Community ratings

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