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Galax GeForce RTX 5090 D Star Nox OC specifications and in-depth review

Galax GeForce RTX 5090 D Star Nox OC

Manufacturer: Galax

The Galax GeForce RTX 5090 D Star Nox OC is a desktop graphics card based on NVIDIA's Blackwell architecture, manufactured using a 5nm semiconductor process. It carries a base GPU clock of 2017 MHz with a boost speed reaching 2452 MHz, and the card includes 32GB of GDDR7 VRAM across a 512-bit memory bus, delivering up to 1790 GB/s of memory bandwidth. RGB lighting is built in, and the card measures 348mm in length and 155mm in height.

On the technical side, the RTX 5090 D Star Nox OC is rated at 106.7 TFLOPS of floating-point performance, backed by 21,760 shading units, 680 texture mapping units, and 176 render output units. The effective memory speed sits at 28,000 MHz, and the card supports DirectX 12 Ultimate, OpenGL 4.6, and OpenCL 3. Connectivity includes one HDMI 2.1b port and three DisplayPort outputs, supporting up to four displays simultaneously. Additional feature support covers ray tracing, DLSS, stereoscopic 3D, Intel Resizable BAR, and ECC memory, with the card connecting via PCIe 5.0.

Pros
  • The 512-bit memory bus combined with GDDR7 VRAM delivers a maximum memory bandwidth of 1790 GB/s, which supports demanding rendering and compute tasks
  • With 32GB of VRAM, the card can handle large textures, complex scenes, and memory-intensive workloads without running short on buffer space
  • Support for ray tracing and DLSS expands rendering capabilities for compatible applications
  • Four video outputs — three DisplayPort and one HDMI 2.1b — allow connection to up to four displays simultaneously
  • Intel Resizable BAR support enables the CPU to access the full GPU frame buffer, which can improve data transfer efficiency
  • ECC memory support helps maintain data integrity during compute-oriented or error-sensitive workloads
Cons
  • A TDP of 575W places significant demand on system power supplies, requiring robust and high-capacity PSU configurations
  • The card measures 348mm in length and 155mm in height, which may not fit in smaller or mid-tower chassis without clearance issues
  • There are no USB-C, DVI, or mini DisplayPort outputs, limiting compatibility with certain monitors or adapters
  • Air-water cooling is not included, meaning users who want liquid cooling will need to source a third-party solution separately
Who is this for?

This card is well-suited to users running workloads that place heavy demands on both compute throughput and memory capacity. With 32GB of GDDR7 VRAM and a 512-bit memory bus delivering up to 1790 GB/s of bandwidth, it fits naturally into environments where large datasets, complex 3D scenes, or high-resolution rendering pipelines are routine. The 106.7 TFLOPS of floating-point performance and DPFP support also make it a solid fit for compute-intensive tasks such as simulation or data processing workloads. Users who need to drive up to four displays simultaneously via a combination of DisplayPort and HDMI 2.1b outputs will also find the connectivity layout practical for multi-monitor setups.

Who is this NOT for?

The card's 575W TDP makes it a poor match for users with constrained power delivery setups, as it demands a high-capacity PSU and adequate system cooling infrastructure. Its physical dimensions of 348mm in length and 155mm in height mean it is not well-suited to compact or small-form-factor cases, where clearance and slot availability are often limited. Additionally, users who rely on USB-C, DVI, or mini DisplayPort connections for their existing display hardware will find no native support here, making this card a poor fit for setups built around those interfaces.

Performance:

GPU clock speed 2017 MHz
GPU turbo 2452 MHz
pixel rate 431.6 GPixel/s
floating-point performance 106.7 TFLOPS
texture rate 1667.4 GTexels/s
GPU memory speed 1750 MHz
shading units 21760
texture mapping units (TMUs) 680
render output units (ROPs) 176
Has Double Precision Floating Point (DPFP) ✓

The Performance section of the Galax GeForce RTX 5090 D Star Nox OC reveals a GPU base clock of 2017 MHz that boosts up to 2452 MHz, paired with a GPU memory speed of 1750 MHz. The card delivers 106.7 TFLOPS of floating-point performance alongside a texture rate of 1667.4 GTexels/s and a pixel rate of 431.6 GPixel/s. Underpinning these figures are 21,760 shading units, 680 texture mapping units, and 176 render output units (ROPs). Double Precision Floating Point (DPFP) is also supported, adding utility for compute-oriented workloads.

Memory:

effective memory speed 28000 MHz
maximum memory bandwidth 1790 GB/s
VRAM 32GB
GDDR version GDDR7
memory bus width 512-bit
Supports ECC memory ✓

The Galax GeForce RTX 5090 D Star Nox OC is equipped with 32GB of GDDR7 VRAM running across a 512-bit memory bus, achieving an effective memory speed of 28,000 MHz and a maximum memory bandwidth of 1790 GB/s. The card also supports ECC memory, which helps detect and correct memory errors during operation.

Features:

DirectX version DirectX 12 Ultimate
OpenGL version 4.6
OpenCL version 3
Supports multi-display technology ✓
supports ray tracing ✓
Supports 3D ✓
supports DLSS ✓
has XeSS (XMX) ✕
AMD SAM / Intel Resizable BAR Intel Resizable BAR
has LHR ✕
has RGB lighting ✓
supported displays 4

The Galax GeForce RTX 5090 D Star Nox OC supports DirectX 12 Ultimate, OpenGL 4.6, and OpenCL 3, covering a broad range of graphics and compute workloads. Ray tracing and DLSS are both supported, along with stereoscopic 3D and multi-display technology spanning up to four screens simultaneously. The card makes use of Intel Resizable BAR for improved CPU-to-GPU data access, and includes RGB lighting. XeSS (XMX) and LHR are not present on this card.

Ports:

has an HDMI output ✓
HDMI ports 1
HDMI version HDMI 2.1b
DisplayPort outputs 3
USB-C ports 0
DVI outputs 0
mini DisplayPort outputs 0

The Galax GeForce RTX 5090 D Star Nox OC offers a total of four video outputs, consisting of three DisplayPort connections and one HDMI 2.1b port. There are no DVI, mini DisplayPort, or USB-C outputs present on this card.

General info:

GPU architecture Blackwell
Thermal Design Power (TDP) 575W
PCI Express (PCIe) version 5
semiconductor size 5 nm
number of transistors 92200 million
Has air-water cooling ✕
width 348 mm
height 155 mm

The Galax GeForce RTX 5090 D Star Nox OC is built on the Blackwell architecture, fabricated using a 5nm process node and housing 92,200 million transistors. It connects via PCIe 5.0 and carries a Thermal Design Power (TDP) of 575W. The card does not feature air-water cooling, and its physical dimensions measure 348mm in width and 155mm in height.

Final Verdict

The Galax GeForce RTX 5090 D Star Nox OC is a specification-dense graphics card built around NVIDIA's Blackwell architecture, designed for users whose workloads push well beyond what mainstream hardware can accommodate. Its 32GB of GDDR7 VRAM paired with 1790 GB/s of memory bandwidth stands out as the defining characteristic of this card, making it particularly well-matched to memory-intensive rendering, compute tasks, and multi-display configurations. The high TDP and substantial physical dimensions do narrow its compatibility with certain system builds, so prospective users should ensure their setup can accommodate its power and space requirements. For those who can meet those demands, the RTX 5090 D Star Nox OC represents a thorough and well-specified option within the high-end graphics card segment.