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Galax GeForce RTX 5070 Stellar Luna OC specifications and in-depth review

Galax GeForce RTX 5070 Stellar Luna OC

Manufacturer: Galax

The Galax GeForce RTX 5070 Stellar Luna OC is a graphics card from Galax based on NVIDIA's Blackwell architecture, manufactured on a 5nm process and housing 31,100 million transistors. It operates at a base clock of 2325 MHz and reaches a turbo frequency of 2587 MHz, with 31.79 TFLOPS of floating-point performance. The card includes RGB lighting and supports up to four simultaneous displays, along with ray tracing, DLSS, and stereoscopic 3D.

On the memory side, the RTX 5070 Stellar Luna OC is equipped with 12GB of GDDR7 VRAM across a 192-bit bus, delivering an effective memory speed of 28,000 MHz and a maximum bandwidth of 672 GB/s. It carries a TDP of 250W and connects via PCIe 5.0. Display output is handled through one HDMI 2.1b port and three DisplayPort connectors, with no USB-C or DVI outputs present. The card measures 345mm in length and 155mm in height, uses air cooling, and supports Intel Resizable BAR alongside DirectX 12 Ultimate and OpenGL 4.6.

Pros
  • Supports up to four simultaneous displays through a combination of one HDMI 2.1b port and three DisplayPort outputs
  • 12GB of GDDR7 VRAM with a 672 GB/s memory bandwidth suits demanding rendering and content workloads
  • Ray tracing and DLSS support are both included, expanding compatibility with modern rendering pipelines
  • ECC memory support adds data integrity protection useful for compute-oriented tasks
  • RGB lighting is built in, offering visual customization for builds where aesthetics matter
  • Intel Resizable BAR support allows the CPU broader access to GPU memory, which can benefit frame delivery in supported scenarios
Cons
  • No USB-C output is available, limiting compatibility with certain modern monitors and portable displays
  • Water cooling is not supported, leaving thermal management entirely dependent on the air cooler
  • The 345mm length may not fit in smaller or compact PC cases
  • A 250W TDP places notable demands on the power supply, requiring careful system planning
  • XeSS (XMX) is not supported, reducing upscaling options to DLSS only
Who is this for?

This card is well-suited to users running demanding rendering, 3D, and compute workloads that benefit from 12GB of GDDR7 VRAM, 672 GB/s of memory bandwidth, and ECC memory support. Content creators and technical users working with ray tracing pipelines will find the combination of ray tracing support and DLSS useful for accelerating output. Those managing multi-display setups of up to four screens will appreciate the four output ports, and builders focused on system aesthetics will find the integrated RGB lighting a practical inclusion. The PCIe 5.0 interface also makes it a natural fit for modern high-end desktop platforms.

Who is this NOT for?

Users working in small form factor or compact PC builds may find the 345mm length a limiting factor, as the card's physical dimensions are better suited to full or mid-tower enclosures. Those who rely on USB-C display connectivity for monitors or portable displays will find no support here, which could restrict setup flexibility. The 250W TDP also makes this card a poor match for systems with modest power supplies or constrained thermal environments, and the absence of water cooling support means users seeking low-noise or high-efficiency thermal solutions will need to rely entirely on the integrated air cooler.

Performance:

GPU clock speed 2325 MHz
GPU turbo 2587 MHz
pixel rate 207 GPixel/s
floating-point performance 31.79 TFLOPS
texture rate 496.7 GTexels/s
GPU memory speed 1750 MHz
shading units 6144
texture mapping units (TMUs) 192
render output units (ROPs) 80
Has Double Precision Floating Point (DPFP) ✓

The Galax GeForce RTX 5070 Stellar Luna OC runs at a base GPU clock of 2325 MHz, boosting up to a turbo frequency of 2587 MHz, and delivers 31.79 TFLOPS of floating-point performance alongside support for Double Precision Floating Point. Its 6,144 shading units work in tandem with 192 texture mapping units and 80 render output units, producing a texture rate of 496.7 GTexels/s and a pixel rate of 207 GPixel/s. GPU memory operates at 1750 MHz, contributing to the card's overall throughput across rendering workloads.

Memory:

effective memory speed 28000 MHz
maximum memory bandwidth 672 GB/s
VRAM 12GB
GDDR version GDDR7
memory bus width 192-bit
Supports ECC memory ✓

The card is equipped with 12GB of GDDR7 VRAM running across a 192-bit memory bus, achieving an effective memory speed of 28,000 MHz and a maximum memory bandwidth of 672 GB/s. ECC memory support is included, adding a layer of data integrity for workloads that benefit from error correction.

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 5070 Stellar Luna OC supports DirectX 12 Ultimate, OpenGL 4.6, and OpenCL 3, covering a broad range of graphics and compute APIs. Ray tracing and DLSS are both supported, while XeSS (XMX) is not present. The card handles up to four simultaneous displays through its multi-display technology and includes stereoscopic 3D support. Intel Resizable BAR is available, LHR is not implemented, and RGB lighting is built into the card's design.

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 present on this model.

General info:

GPU architecture Blackwell
Thermal Design Power (TDP) 250W
PCI Express (PCIe) version 5
semiconductor size 5 nm
number of transistors 31100 million
Has air-water cooling ✕
width 345 mm
height 155 mm

The Galax GeForce RTX 5070 Stellar Luna OC is built on the Blackwell architecture, fabricated using a 5nm process and integrating 31,100 million transistors. It connects via PCIe 5.0 and carries a TDP of 250W, with cooling handled exclusively by air — water cooling is not supported. The card measures 345mm in width and 155mm in height.

Final Verdict

The Galax GeForce RTX 5070 Stellar Luna OC is a well-specified graphics card built around NVIDIA's Blackwell architecture, bringing together a capable set of features for users with demanding visual and compute workloads. Its 12GB of GDDR7 VRAM paired with 672 GB/s of memory bandwidth positions it solidly for ray tracing, multi-display operation, and content-intensive tasks, while ECC memory support and DLSS compatibility add practical value for a broader range of use cases. Physical size and power requirements do place some constraints on system compatibility, and the absence of USB-C output and water cooling support will matter to certain users. Overall, the Stellar Luna OC is a purposeful card for capable desktop builds where its full specification set can be properly leveraged.