GeForce GT 640M vs GeForce GT 645M
GeForce GT 640M
Popular choices:
GeForce GT 645M
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Performance Spectrum - GPU
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.
Value Upgrade Path
This is the official ChipVERSUS Value Rating, comparing raw performance (G3D Mark) per dollar. Components placed above yours deliver better value for money. The GeForce GT 640M is positioned at rank 224 and the GeForce GT 645M is on rank 80, so the GeForce GT 645M offers better cost-efficiency for playing games.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar GeForce GT 640M
Performance Per Dollar GeForce GT 645M
Performance Comparison
About G3D Mark🏆 Chipversus Verdict
🚀 Performance Leadership
The GeForce GT 645M is the superior choice for raw performance. It leads with a 4.2% higher G3D Mark score. This advantage makes it significantly better for higher resolutions (1440p/4K) and graphic-intensive titles compared to the GeForce GT 640M.
| Insight | GeForce GT 640M | GeForce GT 645M |
|---|---|---|
| Performance | ❌Lower raw frame rates (-4.2%) | ✅Leading raw performance (+4.2%) |
| Longevity | 🛑Obsolete Architecture (2012 / Kepler (2012−2018)) | 🛑Obsolete Architecture (2012 / Kepler (2012−2018)) |
| Ecosystem | Supports FSR Upscaling | Supports FSR Upscaling |
| VRAM | ❌ Less VRAM capacity | ✅ More VRAM (+0%) |
| Efficiency | Normal Efficiency | Normal Efficiency |
| Case Fit | — | — |
💎 Value Proposition
While current pricing data is unavailable, the GeForce GT 645M remains the clear technical winner. Check real-time availability to determine if the performance gap justifies the market price.
Performance Check
Real-world benchmarks and performance projections based on comprehensive hardware analysis and comparative metrics. Values represent expected performance on High/Ultra settings at 1080p, 1440p, and 4K. Modeled using a Ryzen 7 7800X3D reference profile to minimize specific CPU bottlenecks.
Note: Performance behavior can vary per game. Specific architectures may perform better or worse depending on game engine optimizations and API implementation.
Technical Specifications
Side-by-side comparison of GeForce GT 640M and GeForce GT 645M
GeForce GT 640M
The GeForce GT 640M is manufactured by NVIDIA. It was released in March 22 2012. It features the Kepler architecture. The core clock ranges from Up to 625 MHz to 645 MHz. It has 384 shading units. The thermal design power (TDP) is 32W. Manufactured using 28 nm process technology. G3D Mark benchmark score: 907 points.
GeForce GT 645M
The GeForce GT 645M 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: 945 points.
Graphics Performance
The GeForce GT 640M scores 907 and the GeForce GT 645M reaches 945 in the G3D Mark benchmark — just a 4.2% difference, making them near-identical in rasterization performance. The GeForce GT 640M is built on Kepler while the GeForce GT 645M uses Kepler, both on a 28 nm process. Shader units: 384 (GeForce GT 640M) vs 384 (GeForce GT 645M). Raw compute: 0.48 TFLOPS (GeForce GT 640M) vs 0.5445 TFLOPS (GeForce GT 645M).
| Feature | GeForce GT 640M | GeForce GT 645M |
|---|---|---|
| G3D Mark Score | 907 | 945+4% |
| Architecture | Kepler | Kepler |
| Process Node | 28 nm | 28 nm |
| Shading Units | 384 | 384 |
| Compute (TFLOPS) | 0.48 TFLOPS | 0.5445 TFLOPS+13% |
| ROPs | 16 | 16 |
| TMUs | 32 | 32 |
| L1 Cache | 32 KB | 32 KB |
| L2 Cache | 256 KB | 256 KB |
Advanced Features (DLSS/FSR)
| Feature | GeForce GT 640M | GeForce GT 645M |
|---|---|---|
| Upscaling Tech | FSR 1.0 (Software) | FSR 1.0 (Software) |
| Frame Generation | Not Supported | Not Supported |
| Ray Reconstruction | No | No |
| Low Latency | Standard | Standard |
Video Memory (VRAM)
Both cards feature 2 GB of GDDR5. Bus width: 128-bit vs 128-bit.
| Feature | GeForce GT 640M | GeForce GT 645M |
|---|---|---|
| VRAM Capacity | 2 GB | 2 GB |
| Memory Type | GDDR5 | GDDR5 |
| Memory Bandwidth | Unknown | Unknown |
| Bus Width | 128-bit | 128-bit |
| L2 Cache | 256 KB | 256 KB |
Display & API Support
DirectX support: 11.0 (GeForce GT 640M) vs 11.0 (GeForce GT 645M). Vulkan: 1.1 vs 1.1. OpenGL: 4.5 vs 4.5. Maximum simultaneous displays: 1 vs 1.
| Feature | GeForce GT 640M | GeForce GT 645M |
|---|---|---|
| DirectX | 11.0 | 11.0 |
| Vulkan | 1.1 | 1.1 |
| OpenGL | 4.5 | 4.5 |
| Max Displays | 1 | 1 |
Media & Encoding
Hardware encoder: NVENC 1.0 (GeForce GT 640M) vs NVENC 1.0 (GeForce GT 645M). Decoder: PureVideo HD VP5 vs PureVideo HD VP5. Supported codecs: MPEG-2,H.264,VC-1,MPEG-4 ASP (GeForce GT 640M) vs MPEG-2,H.264,VC-1,MPEG-4 ASP (GeForce GT 645M).
| Feature | GeForce GT 640M | GeForce GT 645M |
|---|---|---|
| Encoder | NVENC 1.0 | NVENC 1.0 |
| Decoder | PureVideo HD VP5 | PureVideo HD VP5 |
| Codecs | MPEG-2,H.264,VC-1,MPEG-4 ASP | MPEG-2,H.264,VC-1,MPEG-4 ASP |
Power & Dimensions
The GeForce GT 640M draws 32W versus the GeForce GT 645M's 32W — a 0% difference. The GeForce GT 645M is more power-efficient. Recommended PSU: 350W (GeForce GT 640M) vs 350W (GeForce GT 645M). Power connectors: PCIe-powered vs PCIe-powered. Card length: 0mm vs 0mm, occupying 0 vs 0 slots. Typical load temperature: 70°C vs 70°C.
| Feature | GeForce GT 640M | GeForce GT 645M |
|---|---|---|
| TDP | 32W | 32W |
| Recommended PSU | 350W | 350W |
| Power Connector | PCIe-powered | PCIe-powered |
| Length | 0mm | 0mm |
| Height | 0mm | 0mm |
| Slots | 0 | 0 |
| Temp (Load) | 70°C | 70°C |
| Perf/Watt | 28.3 | 29.5+4% |
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