AMD Stream Processor vs NVIDIA GeForce 945A
Graphics Processor
| GPU model | R580 | GM108 |
|---|---|---|
| GPU variant | R580 XTX | — |
| Architecture | R500 | Maxwell |
| Foundry | TSMC | TSMC |
| Manufacturing process | 90 nm | 28 nm |
| Number of transistors | 384 million | unknown |
| Die size | 352 mm² | unknown |
Graphics Card
| Release date | 2006 | — |
|---|---|---|
| Generation | FireStream | — |
| Production | End-of-life | — |
| Interface | PCIe 1.0 x16 | — |
Clocks
| GPU clock | 594 MHz | — |
|---|---|---|
| Memory clock | 648 MHz 1296 Mbps effective | 1253 MHz 5 Gbps effective |
| Base clock | — | 1006 MHz |
| Boost clock | — | 1189 MHz |
Memory Configuration
| Memory size | 1024 MB | 1024 MB |
|---|---|---|
| Memory type | GDDR3 | GDDR5 |
| Memory bus width | 256 bit | 64 bit |
| Bandwidth | 41.47 GB/s | 40.10 GB/s |
Render Configuration
| Pixel shaders | 48 | — |
|---|---|---|
| Vertex shaders | 8 | — |
| TMUs | 16 | 24 |
| ROPs | 16 | 8 |
| Shading units | — | 384 |
| SMM count | — | 3 |
| Cache L1 | — | 64 KB (per SMM) |
| Cache L2 | — | 1024 KB |
Performance
| Pixel rate | 9.504 GPixel/s | 9.512 GPixel/s |
|---|---|---|
| Vertex rate | 1.188 GVertices/s | — |
| Texture rate | 9.504 GTexel/s | 28.54 GTexel/s |
| FP32 (float) performance | — | 913.2 GFLOPS |
| FP64 (double) performance | — | 28.54 GFLOPS (1:32) |
Dimensions & Outputs
| Slot width | Dual-slot | MXM Module |
|---|---|---|
| Length | 241 mm 9.5 inches | — |
| Width | 111 mm 4.4 inches | — |
| TDP | 165 W | 33 W |
| Suggested PSU | 450 W | — |
| Outputs | 2x DVI1x S-Video | No outputs |
| Power connectors | 1x 6-pin | — |
API Support & Features
| DirectX | 9.0c (9_3) | 12 (11_0) |
|---|---|---|
| OpenGL | 2.1 (full) 3.0 (partial) | 4.6 |
| OpenCL | — | 3.0 |
| Vulkan | — | 1.1 |
| Shader model | 3.0 | 5.1 |
| CUDA | — | 5.0 |
Other Features
Mobile graphics
| Release date | — | Mar 13th, 2015 |
|---|---|---|
| Generation | — | GeForce 900A |
| Production | — | End-of-life |
| Interface | — | PCIe 3.0 x8 |
| Predecessor | — | GeForce 800A |
