CPU
GPU
GeForce GT 645M
Popular choices:
Radeon R5 340
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 R5 340 is on rank 136, 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 R5 340
Performance Comparison
About G3D Mark🏆 Chipversus Verdict
🚀 Performance Leadership
The GeForce GT 645M is the superior choice for raw performance. It leads with a 1.1% higher G3D Mark score and 300% more VRAM (2 GB vs 512 MB). This advantage makes it significantly better for higher resolutions (1440p/4K) and graphic-intensive titles compared to the Radeon R5 340.
| Insight | GeForce GT 645M | Radeon R5 340 |
|---|---|---|
| Performance | ✅Leading raw performance (+1.1%) | ❌Lower raw frame rates (-1.1%) |
| Longevity | 🛑Obsolete Architecture (2012 / Kepler (2012−2018)) | 🛑Obsolete Architecture (2017 / GCN 4.0 (2016−2020)) |
| 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 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 645M and Radeon R5 340
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 R5 340
The Radeon R5 340 is manufactured by AMD. It was released in April 20 2017. It features the GCN 4.0 architecture. The core clock ranges from 1183 MHz to 1124 MHz. It has 384 shading units. The thermal design power (TDP) is 50W. Manufactured using 14 nm process technology. G3D Mark benchmark score: 935 points. Launch price was $79.
Graphics Performance
The GeForce GT 645M scores 945 and the Radeon R5 340 reaches 935 in the G3D Mark benchmark — just a 1.1% difference, making them near-identical in rasterization performance. The GeForce GT 645M is built on Kepler while the Radeon R5 340 uses GCN 4.0, both on 28 nm vs 14 nm. Shader units: 384 (GeForce GT 645M) vs 384 (Radeon R5 340). Raw compute: 0.5445 TFLOPS (GeForce GT 645M) vs 0.9085 TFLOPS (Radeon R5 340).
| Feature | GeForce GT 645M | Radeon R5 340 |
|---|---|---|
| G3D Mark Score | 945+1% | 935 |
| Architecture | Kepler | GCN 4.0 |
| Process Node | 28 nm | 14 nm |
| Shading Units | 384 | 384 |
| Compute (TFLOPS) | 0.5445 TFLOPS | 0.9085 TFLOPS+67% |
| ROPs | 16 | 16 |
| TMUs | 32+33% | 24 |
| L1 Cache | 32 KB | 96 KB+200% |
| L2 Cache | 256 KB | 512 KB+100% |
Advanced Features (DLSS/FSR)
| Feature | GeForce GT 645M | Radeon R5 340 |
|---|---|---|
| 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 R5 340 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 512 KB (Radeon R5 340) — the Radeon R5 340 has significantly larger on-die cache to reduce VRAM reliance.
| Feature | GeForce GT 645M | Radeon R5 340 |
|---|---|---|
| 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 | 512 KB+100% |
Power & Dimensions
The GeForce GT 645M draws 32W versus the Radeon R5 340's 50W — a 43.9% difference. The GeForce GT 645M is more power-efficient. Recommended PSU: 350W (GeForce GT 645M) vs 300W (Radeon R5 340). Power connectors: PCIe-powered vs None.
| Feature | GeForce GT 645M | Radeon R5 340 |
|---|---|---|
| TDP | 32W-36% | 50W |
| Recommended PSU | 350W | 300W-14% |
| Power Connector | PCIe-powered | None |
| Length | 0mm | — |
| Height | 0mm | — |
| Slots | 0 | — |
| Temp (Load) | 70°C | — |
| Perf/Watt | 29.5+58% | 18.7 |
Value Analysis
The Radeon R5 340 is the newer GPU (2017 vs 2012).
| Feature | GeForce GT 645M | Radeon R5 340 |
|---|---|---|
| MSRP | — | $99 |
| Avg Price (30d) | — | $25 |
| Codename | GK107 | Lexa |
| Release | October 1 2012 | April 20 2017 |
| Ranking | #903 | #773 |
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