NVIDIA GeForce 615 vs NVIDIA GeForce 820A
Graphics Processor
| GPU model | GF108 | GF117 |
|---|---|---|
| Architecture | Fermi | Fermi 2.0 |
| Foundry | TSMC | TSMC |
| Manufacturing process | 40 nm | 28 nm |
| Number of transistors | 585 million | 585 million |
| Die size | 116 mm² | 116 mm² |
| GPU variant | — | N15V-GM |
Mobile graphics
| Release date | May 15th, 2012 | Mar 17th, 2014 |
|---|---|---|
| Generation | GeForce 600A | GeForce 800A |
| Production | End-of-life | End-of-life |
| Interface | PCIe 2.0 x16 | PCIe 2.0 x16 |
| Successor | GeForce 700A | GeForce 900A |
| Predecessor | — | GeForce 700A |
Clocks
| GPU clock | 660 MHz | 775 MHz |
|---|---|---|
| Shader clock | 1320 MHz | 1550 MHz |
| Memory clock | 900 MHz 1800 Mbps effective | 900 MHz 1800 Mbps effective |
Memory Configuration
| Memory size | 1024 MB | 1024 MB |
|---|---|---|
| Memory type | DDR3 | DDR3 |
| Memory bus width | 128 bit | 64 bit |
| Bandwidth | 28.80 GB/s | 14.40 GB/s |
Render Configuration
| Shading units | 48 | 96 |
|---|---|---|
| TMUs | 8 | 16 |
| ROPs | 4 | 8 |
| SM count | 1 | 2 |
| Cache L1 | 64 KB (per SM) | 64 KB (per SM) |
| Cache L2 | 256 KB | 128 KB |
Performance
| Pixel rate | 1.320 GPixel/s | 3.100 GPixel/s |
|---|---|---|
| Texture rate | 5.280 GTexel/s | 12.40 GTexel/s |
| FP32 (float) performance | 126.7 GFLOPS | 297.6 GFLOPS |
| FP64 (double) performance | 10.56 GFLOPS (1:12) | 24.80 GFLOPS (1:12) |
Dimensions & Outputs
| Slot width | Single-slot | — |
|---|---|---|
| TDP | 49 W | 15 W |
| Outputs | No outputs | No outputs |
API Support & Features
| DirectX | 12 (11_0) | 12 (11_0) |
|---|---|---|
| OpenGL | 4.6 | 4.6 |
| OpenCL | 1.1 | 1.1 |
| Vulkan | — | — |
| CUDA | 2.1 | 2.1 |
| Shader model | 5.1 | 5.1 |
