CPU
GPU
GeForce GT 645M
Popular choices:
Radeon 620
Popular choices:
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 645M is positioned at rank 80 and the Radeon 620 is on rank 375, 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 645M
Performance Per Dollar Radeon 620
Performance Comparison
About G3D Mark🏆 Chipversus Verdict
⚠️ Generational Difference
The Radeon 620 is significantly newer (2019 vs 2012). The Radeon 620 likely supports modern features like Ray Tracing, Tensor Cores, and DLSS/FSR upscaling, which act as force multipliers for performance. The GeForce GT 645M lacks this hardware feature set, limiting its longevity in modern titles despite any raw power similarities.
🚀 Performance Leadership
The Radeon 620 is the superior choice for raw performance. It leads with a 1% higher G3D Mark score. However, the GeForce GT 645M offers more VRAM, which may be beneficial for texture-heavy scenarios at higher resolutions.
| Insight | GeForce GT 645M | Radeon 620 |
|---|---|---|
| Performance | ❌Lower raw frame rates (-1%) | ✅Leading raw performance (+1%) |
| Longevity | 🛑Obsolete Architecture (2012 / Kepler (2012−2018)) | GCN 3.0 (2014−2019) (28nm) |
| Ecosystem | Supports FSR Upscaling | Supports FSR Upscaling |
| VRAM | ✅ More VRAM (+300%) | ❌ Less VRAM capacity |
| Efficiency | 💡 Excellent Perf/Watt | ⚡ Higher Power Consumption |
| Case Fit | — | — |
💎 Value Proposition
While current pricing data is unavailable, the Radeon 620 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 645M and Radeon 620
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.
Radeon 620
The Radeon 620 is manufactured by AMD. It was released in May 13 2019. It features the GCN 3.0 architecture. The core clock ranges from 730 MHz to 1024 MHz. It has 384 shading units. The thermal design power (TDP) is 50W. Manufactured using 28 nm process technology. G3D Mark benchmark score: 954 points.
Graphics Performance
The GeForce GT 645M scores 945 and the Radeon 620 reaches 954 in the G3D Mark benchmark — just a 1% difference, making them near-identical in rasterization performance. The GeForce GT 645M is built on Kepler while the Radeon 620 uses GCN 3.0, both on a 28 nm process. Shader units: 384 (GeForce GT 645M) vs 384 (Radeon 620). Raw compute: 0.5445 TFLOPS (GeForce GT 645M) vs 0.7864 TFLOPS (Radeon 620).
| Feature | GeForce GT 645M | Radeon 620 |
|---|---|---|
| G3D Mark Score | 945 | 954 |
| Architecture | Kepler | GCN 3.0 |
| Process Node | 28 nm | 28 nm |
| Shading Units | 384 | 384 |
| Compute (TFLOPS) | 0.5445 TFLOPS | 0.7864 TFLOPS+44% |
| ROPs | 16+100% | 8 |
| TMUs | 32+33% | 24 |
| L1 Cache | 32 KB | 96 KB+200% |
| L2 Cache | 256 KB+100% | 128 KB |
Advanced Features (DLSS/FSR)
| Feature | GeForce GT 645M | Radeon 620 |
|---|---|---|
| Upscaling Tech | FSR 1.0 (Software) | FSR 1.0 (Software) |
| Frame Generation | Not Supported | Not Supported |
| Ray Reconstruction | No | No |
| Low Latency | Standard | AMD Anti-Lag |
Video Memory (VRAM)
The GeForce GT 645M comes with 2 GB of VRAM, while the Radeon 620 has 512 MB. The GeForce GT 645M offers 300% more capacity, crucial for higher resolutions and texture-heavy games. Bus width: 128-bit vs 128-bit. L2 Cache: 256 KB (GeForce GT 645M) vs 128 KB (Radeon 620) — the GeForce GT 645M has significantly larger on-die cache to reduce VRAM reliance.
| Feature | GeForce GT 645M | Radeon 620 |
|---|---|---|
| VRAM Capacity | 2 GB+300% | 0.5 GB |
| Memory Type | GDDR5 | GDDR5 |
| Memory Bandwidth | Unknown | Unknown |
| Bus Width | 128-bit | 128-bit |
| L2 Cache | 256 KB+100% | 128 KB |
Power & Dimensions
The GeForce GT 645M draws 32W versus the Radeon 620's 50W — a 43.9% difference. The GeForce GT 645M is more power-efficient. Recommended PSU: 350W (GeForce GT 645M) vs 350W (Radeon 620). Power connectors: PCIe-powered vs PCIe-powered.
| Feature | GeForce GT 645M | Radeon 620 |
|---|---|---|
| TDP | 32W-36% | 50W |
| Recommended PSU | 350W | 350W |
| Power Connector | PCIe-powered | PCIe-powered |
| Length | 0mm | — |
| Height | 0mm | — |
| Slots | 0 | — |
| Temp (Load) | 70°C | — |
| Perf/Watt | 29.5+54% | 19.1 |
Value Analysis
The Radeon 620 is the newer GPU (2019 vs 2012).
| Feature | GeForce GT 645M | Radeon 620 |
|---|---|---|
| MSRP | — | $100 |
| Avg Price (30d) | — | $50 |
| Codename | GK107 | Polaris 24 |
| Release | October 1 2012 | May 13 2019 |
| Ranking | #903 | #898 |
Top Performing GPUs
The most powerful gpus ranked by G3D Mark benchmark scores.
You May Also Compare
Similar GPU comparisons based on GeForce GT 645M and Radeon 620
