GeForce GT 645
Iris Pro Graphics 580
GeForce GT 645 vs Iris Pro Graphics 580 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 GT 645 vs Iris Pro Graphics 580 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 GT 645 vs Iris Pro Graphics 580: 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 GT 645
2012Why buy it
- ✅Delivers 100+% more G3D Mark for each dollar spent, at 20.3 vs 0 G3D/$ ($99 MSRP vs Unknown MSRP).
- ✅100+% more VRAM for high-resolution textures and newer games (2 GB vs Unknown).
- ✅Iris Pro Graphics 580 is already obsolete for modern gaming, so GeForce GT 645 is the less risky modern option long term.
- ✅Draws 32W instead of 45W, a 13W reduction.
Trade-offs
- ❌2012 hardware with 2 GB of VRAM is already well past its comfortable zone for modern gaming, so it is hard to recommend now.
Iris Pro Graphics 580
2015Why buy it
- ✅More future proof: Generation 9.0 (2015−2016) on 14nm with a newer platform for upcoming games.
Trade-offs
- ❌Less VRAM, with Unknown vs 2 GB for high-resolution textures and newer games.
- ❌2015 hardware with Unknown of VRAM is already well past its comfortable zone for modern gaming, so it is hard to recommend now.
- ❌Lower G3D Mark per dollar, at 0 vs 20.3 G3D/$ (Unknown MSRP vs $99 MSRP).
- ❌40.6% higher power demand at 45W vs 32W.
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GeForce GT 645 vs Iris Pro Graphics 580 Technical Specifications
Side-by-side specs, architecture details, clocks, memory, power, and platform differences.
GeForce GT 645
The GeForce GT 645 is manufactured by NVIDIA. It was released in October 1 2012. It features the Kepler architecture. The core clock speed is Up to 710 MHz. It has 384 shading units. The thermal design power (TDP) is 32W. Manufactured using 28 nm process technology. G3D Mark benchmark score: 2,006 points.
Iris Pro Graphics 580
The Iris Pro Graphics 580 is manufactured by Intel. It was released in September 1 2015. It features the Generation 9.0 architecture. The core clock ranges from 350 MHz to 950 MHz. It has 576 shading units. The thermal design power (TDP) is 45W. Manufactured using 14 nm+ process technology. G3D Mark benchmark score: 1,985 points.
Graphics Performance
The GeForce GT 645 scores 2,006 and the Iris Pro Graphics 580 reaches 1,985 in the G3D Mark benchmark — just a 1.1% difference, making them near-identical in rasterization performance. The GeForce GT 645 is built on Kepler while the Iris Pro Graphics 580 uses Generation 9.0, both on 28 nm vs 14 nm+. Shader units: 384 (GeForce GT 645) vs 576 (Iris Pro Graphics 580). Raw compute: 0.5445 TFLOPS (GeForce GT 645) vs 1.094 TFLOPS (Iris Pro Graphics 580).
| Feature | GeForce GT 645 | Iris Pro Graphics 580 |
|---|---|---|
| G3D Mark Score | 2,006+1% | 1,985 |
| Architecture | Kepler | Generation 9.0 |
| Process Node | 28 nm | 14 nm+ |
| Shading Units | 384 | 576+50% |
| Compute (TFLOPS) | 0.5445 TFLOPS | 1.094 TFLOPS+101% |
| ROPs | 16+78% | 9 |
| TMUs | 32 | 72+125% |
Advanced Features (DLSS/FSR)
The GeForce GT 645 gets NVIDIA DLSS, which still tends to look cleaner in motion. The Iris Pro Graphics 580 leans on FSR, which is flexible and widely supported, but usually a bit rougher at the same settings.
| Feature | GeForce GT 645 | Iris Pro Graphics 580 |
|---|---|---|
| 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 GT 645 has 2 GB of VRAM, while the Iris Pro Graphics 580 carries 0 MB. GeForce GT 645 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 GT 645 and System on the Iris Pro Graphics 580.
| Feature | GeForce GT 645 | Iris Pro Graphics 580 |
|---|---|---|
| VRAM Capacity | 2 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 GT 645) vs 12 (12_1) (Iris Pro Graphics 580). Vulkan: 1.2 vs 1.2. OpenGL: 4.6 vs 4.6. Maximum simultaneous displays: 3 vs 3.
| Feature | GeForce GT 645 | Iris Pro Graphics 580 |
|---|---|---|
| DirectX | 12 (11_0) | 12 (12_1) |
| Vulkan | 1.2 | 1.2 |
| OpenGL | 4.6 | 4.6 |
| Max Displays | 3 | 3 |
Media & Encoding
Hardware encoder: NVENC (1st Gen) (GeForce GT 645) vs Quick Sync Video (Iris Pro Graphics 580). Decoder: NVDEC (1st Gen) vs Quick Sync Video. Supported codecs: H.264,MPEG-2,VC-1 (GeForce GT 645) vs H.264,H.265,VP8,VP9 (Iris Pro Graphics 580).
| Feature | GeForce GT 645 | Iris Pro Graphics 580 |
|---|---|---|
| Encoder | NVENC (1st Gen) | Quick Sync Video |
| Decoder | NVDEC (1st Gen) | Quick Sync Video |
| Codecs | H.264,MPEG-2,VC-1 | H.264,H.265,VP8,VP9 |
Power & Dimensions
The GeForce GT 645 draws 32W versus the Iris Pro Graphics 580's 45W — a 33.8% difference. The GeForce GT 645 is more power-efficient. Recommended PSU: 350W (GeForce GT 645) vs 0W (Iris Pro Graphics 580). Power connectors: PCIe-powered vs None. Card length: 145mm vs 0mm, occupying 1 vs 0 slots. Typical load temperature: 80 vs 80.
| Feature | GeForce GT 645 | Iris Pro Graphics 580 |
|---|---|---|
| TDP | 32W-29% | 45W |
| Recommended PSU | 350W | 0W-100% |
| Power Connector | PCIe-powered | None |
| Length | 145mm | 0mm |
| Height | 111mm | 0mm |
| Slots | 1 | 0-100% |
| Temp (Load) | 80 | 80 |
| Perf/Watt | 62.7+42% | 44.1 |
Value Analysis
At launch, the GeForce GT 645 came in at $99, while the Iris Pro Graphics 580 launched at $0. On MSRP, Iris Pro Graphics 580 was 100+% cheaper ($99 less). Performance per dollar on MSRP (G3D Mark / MSRP): 20.3 (GeForce GT 645) vs Infinity (Iris Pro Graphics 580) — the Iris Pro Graphics 580 offers Infinity% better value. The newer card here is Iris Pro Graphics 580 (2015 vs 2012).
| Feature | GeForce GT 645 | Iris Pro Graphics 580 |
|---|---|---|
| MSRP | $99 | $0-100% |
| Performance per Dollar | 20.3 | Infinity |
| Codename | GK107 | Skylake GT4e |
| Release | October 1 2012 | September 1 2015 |
| Ranking | #903 | #707 |
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