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

Galax GeForce RTX 5090 D Luna OC

Manufacturer: Galax

The Galax GeForce RTX 5090 D Luna OC is a high-end graphics card based on NVIDIA's Blackwell architecture, manufactured on a 5nm process with 92,200 million transistors. It operates at a base clock of 2017 MHz, boosting up to 2452 MHz under load, and delivers 106.7 TFLOPS of floating-point performance. The card also features RGB lighting and supports up to four displays simultaneously.

On the memory side, the RTX 5090 D Luna OC is equipped with 32GB of GDDR7 VRAM across a 512-bit bus, reaching an effective memory speed of 28,000 MHz and a peak bandwidth of 1,790 GB/s. It supports DirectX 12 Ultimate, OpenGL 4.6, OpenCL 3, ray tracing, and DLSS, alongside Intel Resizable BAR. Connectivity includes one HDMI 2.1b port and three DisplayPort outputs. The card measures 348mm in length and 155mm in height, with a rated TDP of 575W and a PCIe 5.0 interface.

Pros
  • Equipped with 32GB of GDDR7 VRAM across a 512-bit bus, supporting a wide range of memory-intensive workloads
  • Delivers 106.7 TFLOPS of floating-point performance alongside a texture rate of 1667 GTexels/s, reflecting substantial compute throughput
  • Supports ray tracing, DLSS, and DirectX 12 Ultimate, enabling a broad set of modern rendering features
  • ECC memory support adds a layer of data integrity for error-sensitive tasks
  • Four simultaneous display outputs via one HDMI 2.1b port and three DisplayPort connections offer flexible multi-monitor setups
  • RGB lighting provides visual customization options for users who care about system aesthetics
Cons
  • A 575W TDP places considerable demands on the power supply and system cooling infrastructure
  • The card's 348mm length may create fitment challenges in smaller or mid-tower cases
  • No USB-C or DVI outputs limits connectivity options for users with older or specialized display hardware
  • Air-water combined cooling is not included, so thermal management relies solely on the air cooling solution
  • XeSS (XMX) support is absent, restricting access to that particular upscaling technology
Who is this for?

This card is well-suited to users who regularly work with memory-intensive rendering, simulation, or compute workloads, given its 32GB of GDDR7 VRAM and ECC memory support, which adds reliability for error-sensitive professional tasks. The combination of 106.7 TFLOPS of floating-point performance, ray tracing, DLSS, and DirectX 12 Ultimate also makes it a strong fit for those running demanding real-time 3D applications or modern game titles at high fidelity. Users who operate multi-display setups of up to four screens will also benefit from the card's output configuration of one HDMI 2.1b and three DisplayPort connections.

Who is this NOT for?

The card's 575W TDP makes it a poor match for users with modest or older power supplies, as the system will require robust power delivery and adequate airflow to sustain stable operation. Its 348mm length also rules it out for compact or small form factor builds where physical fitment is a constraint. Users who rely on USB-C display output or XeSS upscaling will find those capabilities absent here, making this card a mismatch for workflows or display setups that depend on either feature.

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 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 Galax GeForce RTX 5090 D Luna OC runs at a base GPU clock of 2017 MHz, boosting up to 2452 MHz in turbo mode, while the GPU memory operates at 1750 MHz. On the compute side, it delivers 106.7 TFLOPS of floating-point performance, a pixel rate of 431.6 GPixel/s, and a texture rate of 1667 GTexels/s. These figures are backed by 21,760 shading units, 680 texture mapping units, and 176 render output units, and the card also supports Double Precision Floating Point (DPFP) processing.

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 card is equipped with 32GB of GDDR7 VRAM running across a 512-bit memory bus, reaching an effective memory speed of 28,000 MHz and a peak bandwidth of 1,790 GB/s. ECC memory support is also included, allowing for error detection and correction 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 Luna OC supports DirectX 12 Ultimate, OpenGL 4.6, and OpenCL 3, covering a broad range of graphics and compute workloads. It includes hardware-accelerated ray tracing, DLSS, and stereoscopic 3D support, while XeSS (XMX) and LHR are not present. Multi-display technology is supported with a maximum of four simultaneous outputs, and Intel Resizable BAR is available for optimized CPU-to-GPU data transfers. The card also features RGB lighting for visual customization.

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 card's output configuration consists of one HDMI 2.1b port and three DisplayPort outputs, providing a total of four display connections. There are no USB-C, DVI, or mini DisplayPort outputs included.

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 Luna OC is built on the Blackwell architecture, fabricated using a 5nm process and integrating 92,200 million transistors. It connects via a PCIe 5.0 interface and carries a rated TDP of 575W, with cooling handled by an air-based solution rather than a combined air-water system. The card measures 348mm in width and 155mm in height.

Final Verdict

The Galax GeForce RTX 5090 D Luna OC is a specification-dense graphics card built around NVIDIA's Blackwell architecture, combining a substantial compute profile with a generous 32GB of GDDR7 VRAM and 1,790 GB/s of memory bandwidth — a configuration that aligns well with demanding rendering, multi-display workflows, and compute-heavy tasks that benefit from ECC support. Its feature set, spanning ray tracing, DLSS, and DirectX 12 Ultimate, covers the full scope of modern graphics requirements, while the 575W TDP and 348mm card length mean that system compatibility deserves careful consideration before deployment. For users with the infrastructure to accommodate it, the RTX 5090 D Luna OC represents a thorough and well-specified option within the high-end graphics card segment.

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