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Galax GeForce RTX 5080 Stellar Luna OC specifications and in-depth review

Galax GeForce RTX 5080 Stellar Luna OC

Manufacturer: Galax

The Galax GeForce RTX 5080 Stellar Luna OC is a high-specification graphics card based on NVIDIA's Blackwell architecture, manufactured on a 5 nm process with 45,600 million transistors. It ships with 16GB of GDDR7 memory across a 256-bit bus, delivering up to 960 GB/s of memory bandwidth at an effective speed of 30,000 MHz. The card includes RGB lighting and supports up to four displays simultaneously, making it a well-rounded option for demanding rendering workloads.

On the performance side, the Galax RTX 5080 Stellar Luna OC runs a base GPU clock of 2,295 MHz with a boosted frequency reaching 2,685 MHz, translating to 57.74 TFLOPS of floating-point throughput and a texture rate of 902.2 GTexels/s. Its 10,752 shading units are complemented by 336 texture mapping units and 112 render output units. The card supports DirectX 12 Ultimate, OpenGL 4.6, OpenCL 3.0, ray tracing, DLSS, and Intel Resizable BAR, while connectivity is handled through one HDMI 2.1b port and three DisplayPort outputs. With a TDP of 360W and PCIe 5.0 compatibility, it measures 348 mm in length and 155 mm in height.

Pros
  • Supports up to four displays simultaneously, offering flexible multi-monitor setups
  • Comes with 16GB of GDDR7 memory across a 256-bit bus, delivering 960 GB/s of bandwidth
  • Includes ECC memory support, adding data integrity reliability for compute workloads
  • Features ray tracing, DLSS, and DirectX 12 Ultimate support for a broad range of modern rendering capabilities
  • RGB lighting is built in, allowing visual customization of the card's appearance
  • Does not include LHR, meaning compute throughput is fully unrestricted
Cons
  • 360W TDP places significant demands on system power supply capacity
  • At 348 mm in length, the card requires a spacious case to fit properly
  • No USB-C or DVI outputs, limiting connectivity options for users with older or specialized monitors
  • Cooling relies entirely on air, with no integrated water-cooling option available
  • Only a single HDMI port is provided, which may be limiting for users with multiple HDMI-dependent displays
Who is this for?

This card is well suited to users running demanding rendering, 3D visualization, or GPU compute workloads that benefit from 57.74 TFLOPS of floating-point throughput, ECC memory support, and Double Precision Floating Point capability. Content creators and professionals who need multi-display setups of up to four screens will find the combination of three DisplayPort outputs and one HDMI 2.1b port practical for their workflows. The full GDDR7 memory configuration with 960 GB/s bandwidth also makes it a strong fit for tasks involving large datasets or high-resolution texture work where memory throughput is a consistent bottleneck.

Who is this NOT for?

Users working in space-constrained builds will likely find the 348 mm card length problematic, as it demands a full-size tower with adequate clearance. The 360W TDP makes this card unsuitable for systems with modest power supplies, as it requires a well-specced PSU to operate stably. Additionally, users who rely on USB-C display output or have legacy DVI monitors will find no support for either interface, making this a poor fit for anyone whose display ecosystem depends on those connection types.

Performance:

GPU clock speed 2295 MHz
GPU turbo 2685 MHz
pixel rate 300.7 GPixel/s
floating-point performance 57.74 TFLOPS
texture rate 902.2 GTexels/s
GPU memory speed 1875 MHz
shading units 10752
texture mapping units (TMUs) 336
render output units (ROPs) 112
Has Double Precision Floating Point (DPFP) ✓

The Performance section of the Galax GeForce RTX 5080 Stellar Luna OC shows a GPU base clock of 2,295 MHz that boosts up to 2,685 MHz, supported by 10,752 shading units, 336 texture mapping units, and 112 render output units. These combine to deliver a texture rate of 902.2 GTexels/s and a pixel rate of 300.7 GPixel/s, with overall floating-point throughput reaching 57.74 TFLOPS. The GPU memory operates at 1,875 MHz, and the card includes support for Double Precision Floating Point (DPFP), broadening its suitability for compute-intensive tasks beyond standard graphics rendering.

Memory:

effective memory speed 30000 MHz
maximum memory bandwidth 960 GB/s
VRAM 16GB
GDDR version GDDR7
memory bus width 256-bit
Supports ECC memory ✓

The Galax GeForce RTX 5080 Stellar Luna OC is equipped with 16GB of GDDR7 memory running across a 256-bit bus at an effective speed of 30,000 MHz, yielding a maximum memory bandwidth of 960 GB/s. The card also supports ECC memory, which helps detect and correct memory errors during operation, adding a layer of reliability for compute workloads that require data integrity.

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 5080 Stellar Luna OC supports DirectX 12 Ultimate, OpenGL 4.6, and OpenCL 3, covering a broad range of graphics and compute APIs. It includes hardware-accelerated ray tracing, DLSS, and stereoscopic 3D support, while XeSS (XMX) is not present on this card. Multi-display technology allows connection of up to four screens simultaneously, and Intel Resizable BAR is supported for improved CPU-to-GPU data throughput. The card does not feature LHR, and it includes RGB lighting. It does not carry an LHR limiter, leaving its compute throughput unrestricted.

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 5080 Stellar Luna OC offers a total of four video outputs: one HDMI 2.1b port and three DisplayPort outputs. There are no USB-C, DVI, or mini DisplayPort connectors on this card, keeping the output configuration straightforward and focused on the two most current display interface standards.

General info:

GPU architecture Blackwell
Thermal Design Power (TDP) 360W
PCI Express (PCIe) version 5
semiconductor size 5 nm
number of transistors 45600 million
Has air-water cooling ✕
width 348 mm
height 155 mm

The Galax GeForce RTX 5080 Stellar Luna OC is built on the Blackwell architecture, fabbed at 5 nm and integrating 45,600 million transistors. It connects via PCIe 5.0 and carries a TDP of 360W, requiring adequate system power headroom. The card measures 348 mm in width and 155 mm in height, and relies solely on air cooling without any integrated water-cooling solution.

Final Verdict

The Galax GeForce RTX 5080 Stellar Luna OC is a specification-dense graphics card built around the Blackwell architecture, and its combination of 57.74 TFLOPS of floating-point performance alongside 16GB of GDDR7 memory at 960 GB/s bandwidth positions it firmly as a card designed for users with serious rendering, compute, or high-resolution workload demands. Its support for ray tracing, DLSS, DirectX 12 Ultimate, ECC memory, and up to four simultaneous displays rounds out a feature set that covers both professional and advanced creative use cases. That said, its 360W TDP and 348 mm length mean it is best suited to systems built with the headroom to accommodate it. For users whose hardware and workflow align with what this card requires, the Galax RTX 5080 Stellar Luna OC delivers a well-equipped, fully unrestricted compute and graphics platform.