RTX 5080 vs RTX 4080 Super: The Next Gen Showdown
In the boutique gaming PC and custom workstation space, thermal efficiency and raw computing power dictate stability. With NVIDIA's next-generation Blackwell architecture landing on the market, Sydney builders face a major decision: should you select the newly released **RTX 5080** or save on the seasoned **RTX 4080 Super**?
In this guide, we dive deep into the architecture, benchmarks, cooling profiles, and value equations based on real-world testing from the Savvy Computers engineering lab.
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Architectural Comparison: Blackwell vs Ada Lovelace
At the core of the **RTX 5080** is the Blackwell arch, utilizing a custom TSMC 4N process node. This compared to the Ada Lovelace node on the **RTX 4080 Super** brings dramatic improvements in transistor density and cache layout.
| Specification | RTX 5080 (Blackwell) | RTX 4080 Super (Ada Lovelace) |
|---|---|---|
| **CUDA Cores** | 10,752 | 10,240 |
| **VRAM** | 16GB GDDR7 | 16GB GDDR6X |
| **Memory Bus Width** | 256-bit | 256-bit |
| **Memory Bandwidth** | Up to 896 GB/s | 736 GB/s |
| **Total Board Power (TBP)** | 350W | 320W |
The transition to **GDDR7 memory** on the RTX 5080 is the real game-changer. By increasing memory bandwidth by over 20%, high-resolution 4K gaming and heavy neural network training tasks receive a massive performance pipeline boost.
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Thermal Deltas & Cooling Requirements
One of our key design principles at Savvy Computers is **extreme thermal efficiency**.
Under a sustained 100% stress-test load in our boutique Sydney workshop (ambient 22°C): - **RTX 4080 Super (Triple Fan Open-Air)**: Peak temp settled at **64°C** with hotspot at **78°C**. - **RTX 5080 (Blackwell Reference / Custom AIB)**: Peak temp settled at **67°C** with hotspot at **82°C**.
Because the RTX 5080 draws an extra 30W of power, maintaining case airflow is critical. We recommend a minimum of three 140mm intake fans and an ultra-breathable mesh chassis like the Lian Li O11 Dynamic EVO or Fractal North.
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Benchmark Highlights (Average FPS at 4K Ultra)
We tested these GPUs coupled with an AMD Ryzen 7 9800X3D and 32GB of DDR5-6000 memory.
- **Cyberpunk 2077 (RT Overdrive, DLSS Frame Gen)**:
- - RTX 5080: **84 FPS**
- - RTX 4080 Super: **68 FPS**
- **Alan Wake 2 (Path Tracing, DLSS Quality)**:
- - RTX 5080: **62 FPS**
- - RTX 4080 Super: **49 FPS**
- **Assetto Corsa Competizione (Sydney Sim-Rig Profile, 4K Triple Screen)**:
- - RTX 5080: **142 FPS**
- - RTX 4080 Super: **118 FPS**
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Verdict: Which Should You Build With?
1. **Choose the RTX 5080 if**: You want absolute future-proofing, play path-traced titles, run triple-4K sim-rig monitors, or use AI development stacks requiring high GDDR7 bandwidth. 2. **Choose the RTX 4080 Super if**: You are targeting standard 4K high-refresh gaming and prefer a slightly lower budget setup while still keeping top-tier specs.
Looking to build a premium custom PC in Sydney? Head over to our [Apex Elite Workstation](/workstations) page or contact our engineers to design your dream build.