GeForce GTX 580M SLI
Iris Plus Graphics 655
GeForce GTX 580M SLI vs Iris Plus Graphics 655 Performance Spectrum
About G3D Mark
G3D Mark is a standard benchmark that measures graphics performance in real-world gaming scenarios. It simplifies comparing cards from different brands, where higher scores directly correlate with better fps and smoother gaming experiences.
GeForce GTX 580M SLI vs Iris Plus Graphics 655 FPS Benchmarks
Predicted gaming performance across popular games. Tested paired with Ryzen 7 9800X3D to isolate GPU performance.
Search any supported game below to compare 1080p FPS for both components.
Path of Exile 2
Counter-Strike 2
League of Legends
GeForce GTX 580M SLI vs Iris Plus Graphics 655: Pros, Cons & Final Verdict
See where each GPU makes more sense in practice: raw FPS, VRAM, features, power draw, pricing, and long-term headroom.
GeForce GTX 580M SLI
2011Why buy it
- ✅100+% more VRAM for high-resolution textures and newer games (512 MB vs Unknown).
- ✅Iris Plus Graphics 655 is already obsolete for modern gaming, so GeForce GTX 580M SLI is the less risky modern option long term.
Trade-offs
- ❌2011 hardware with 512 MB of VRAM is already well past its comfortable zone for modern gaming, so it is hard to recommend now.
- ❌566.7% higher power demand at 100W vs 15W.
Iris Plus Graphics 655
2018Why buy it
- ✅Draws 15W instead of 100W, a 85W reduction.
- ✅More future proof: Generation 9.5 (2016−2020) on 14nm with a newer platform for upcoming games.
Trade-offs
- ❌Less VRAM, with Unknown vs 512 MB for high-resolution textures and newer games.
- ❌2018 hardware with Unknown of VRAM is already well past its comfortable zone for modern gaming, so it is hard to recommend now.
Quick Answers
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GeForce GTX 580M SLI vs Iris Plus Graphics 655 Technical Specifications
Side-by-side specs, architecture details, clocks, memory, power, and platform differences.
GeForce GTX 580M SLI
The GeForce GTX 580M SLI is manufactured by NVIDIA. It was released in January 6 2011. It features the Fermi architecture. The core clock speed is 620 MHz. It has 768 shading units. The thermal design power (TDP) is 100W. Manufactured using 40 nm process technology. G3D Mark benchmark score: 1,771 points.
Iris Plus Graphics 655
The Iris Plus Graphics 655 is manufactured by Intel. It was released in April 3 2018. It features the Generation 9.5 architecture. The core clock ranges from 300 MHz to 1050 MHz. It has 384 shading units. The thermal design power (TDP) is 15W. Manufactured using 14 nm+++ process technology. G3D Mark benchmark score: 1,729 points.
Graphics Performance
The GeForce GTX 580M SLI scores 1,771 and the Iris Plus Graphics 655 reaches 1,729 in the G3D Mark benchmark — just a 2.4% difference, making them near-identical in rasterization performance. The GeForce GTX 580M SLI is built on Fermi while the Iris Plus Graphics 655 uses Generation 9.5, both on 40 nm vs 14 nm+++. Shader units: 768 (GeForce GTX 580M SLI) vs 384 (Iris Plus Graphics 655).
| Feature | GeForce GTX 580M SLI | Iris Plus Graphics 655 |
|---|---|---|
| G3D Mark Score | 1,771+2% | 1,729 |
| Architecture | Fermi | Generation 9.5 |
| Process Node | 40 nm | 14 nm+++ |
| Shading Units | 768+100% | 384 |
Advanced Features (DLSS/FSR)
The GeForce GTX 580M SLI gets NVIDIA DLSS, which still tends to look cleaner in motion. The Iris Plus Graphics 655 leans on FSR, which is flexible and widely supported, but usually a bit rougher at the same settings.
| Feature | GeForce GTX 580M SLI | Iris Plus Graphics 655 |
|---|---|---|
| Upscaling Tech | Upscaling support | Upscaling support |
| Frame Generation | Not Supported | Not Supported |
| Ray Reconstruction | No | No |
| Low Latency | NVIDIA Reflex | Standard |
Video Memory (VRAM)
The GeForce GTX 580M SLI has 512 MB of VRAM, while the Iris Plus Graphics 655 carries 0 MB. GeForce GTX 580M SLI gives you 100+% more memory capacity, which matters more once you move into heavier textures, mods, or higher resolutions. Memory bus width is 128-bit on the GeForce GTX 580M SLI and System on the Iris Plus Graphics 655.
| Feature | GeForce GTX 580M SLI | Iris Plus Graphics 655 |
|---|---|---|
| VRAM Capacity | 0.5 GB | Shared System RAM |
| Memory Type | GDDR5 | Shared |
| Memory Bandwidth | Unknown | System |
| Bus Width | 128-bit | System |
Display & API Support
DirectX support: 12 (11_0) (GeForce GTX 580M SLI) vs 12 (12_1) (Iris Plus Graphics 655). Vulkan: 1.2 vs 1.2. OpenGL: 4.0 vs 4.6. Maximum simultaneous displays: 2 vs 3.
| Feature | GeForce GTX 580M SLI | Iris Plus Graphics 655 |
|---|---|---|
| DirectX | 12 (11_0) | 12 (12_1) |
| Vulkan | 1.2 | 1.2 |
| OpenGL | 4.0 | 4.6+15% |
| Max Displays | 2 | 3+50% |
Media & Encoding
Hardware encoder: PureVideo HD VP4 (GeForce GTX 580M SLI) vs QuickSync (Iris Plus Graphics 655). Decoder: PureVideo HD VP4 vs QuickSync. Supported codecs: H.264,VC-1,MPEG-2,MPEG-4 ASP (GeForce GTX 580M SLI) vs H.264,H.265,VP9 (Iris Plus Graphics 655).
| Feature | GeForce GTX 580M SLI | Iris Plus Graphics 655 |
|---|---|---|
| Encoder | PureVideo HD VP4 | QuickSync |
| Decoder | PureVideo HD VP4 | QuickSync |
| Codecs | H.264,VC-1,MPEG-2,MPEG-4 ASP | H.264,H.265,VP9 |
Power & Dimensions
The GeForce GTX 580M SLI draws 100W versus the Iris Plus Graphics 655's 15W — a 147.8% difference. The Iris Plus Graphics 655 is more power-efficient. Recommended PSU: 350W (GeForce GTX 580M SLI) vs 1W (Iris Plus Graphics 655). Power connectors: 1x 6-pin vs Integrated. Typical load temperature: 90°C vs 85.
| Feature | GeForce GTX 580M SLI | Iris Plus Graphics 655 |
|---|---|---|
| TDP | 100W | 15W-85% |
| Recommended PSU | 350W | 1W-100% |
| Power Connector | 1x 6-pin | Integrated |
| Length | — | 0mm |
| Height | — | 0mm |
| Slots | 0 | 0 |
| Temp (Load) | 90°C | 85-6% |
| Perf/Watt | 17.7 | 115.3+551% |
Value Analysis
The newer card here is Iris Plus Graphics 655 (2018 vs 2011).
| Feature | GeForce GTX 580M SLI | Iris Plus Graphics 655 |
|---|---|---|
| MSRP | — | $0 |
| Codename | N12E-GTX2 | Coffee Lake GT3e |
| Release | January 6 2011 | April 3 2018 |
| Ranking | #509 | #723 |
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