Maximum capacity and throughput
- 32 GB GDDR7 on a 512-bit interface
- 1,792 GB/s published memory bandwidth
- 21,760 CUDA cores
- 575 W total graphics power
- 1,000 W required system power for NVIDIA's reference configuration
RTX 5090 versus RTX 5070: understand the system, not just the name.
Both are Blackwell graphics cards with current RTX features, but they target very different power, memory, cooling, workload, and budget requirements. This guide explains NVIDIA's published specifications without substituting marketing charts for independent testing.
A smaller system target
- 12 GB GDDR7 on a 192-bit interface
- 672 GB/s published memory bandwidth
- 6,144 CUDA cores
- 250 W total graphics power
- 650 W required system power for NVIDIA's reference configuration
Blackwell features
- Fifth-generation Tensor cores
- Fourth-generation ray-tracing cores
- DLSS 4 feature support
- Reflex support and ninth-generation NVENC
- AV1 encode and decode support
What the specification gap means
VRAM capacity and bandwidth are different measurements. Capacity limits how much scene, model, texture, and application data can remain resident. Bandwidth affects how quickly the GPU can move that data. The 5090's larger pool and wider interface matter most for unusually heavy rendering, AI, creation, or high-resolution workloads. They do not make every game or everyday task improve by the same percentage.
The CUDA-core counts are useful only inside the same architecture and still do not predict a complete experience. CPU limits, game engine behavior, resolution, settings, drivers, thermals, and the use of upscaling or generated frames all change the result. Treat manufacturer performance charts as vendor evidence, then consult current independent tests for the exact games and applications you use.
Start with fit, power, and the display
- Case: verify the exact partner card's length, height, slot thickness, cable clearance, and airflow. Board designs vary from NVIDIA's reference specifications.
- Power: check the PSU's continuous rating, age, connector instructions, transient capability, and the card manufacturer's requirement. Do not sharply bend or partially seat a high-power connector.
- CPU and display: a high-end GPU cannot remove every CPU bottleneck, and a workload aimed at 1440p is not the same as high-refresh 4K creation or rendering.
- Software: confirm that the games and applications you care about support the features being advertised. Generated frames are not identical to traditionally rendered frames and should not replace a healthy base frame rate.
A decision that avoids overspending
- Write down your current CPU, PSU model, case clearance, display resolution, and refresh rate.
- List five real games or applications and the problem you need the upgrade to solve.
- Check VRAM use, frame time, utilization, and temperatures in those workloads.
- Compare current independent tests at your settings; do not compare only a generated-frame headline.
- Price the complete system change, including PSU, case, cooling, or display changes—not only the GPU.
Official sources checked
NVIDIA: GeForce RTX 5090 specifications
NVIDIA: GeForce RTX 5070 family specifications
NVIDIA: RTX Blackwell architecture whitepaper
Last reviewed: July 26, 2026. Specifications and software features can change. Verify the exact add-in-board model before purchasing.