AMD Radeon R9 255 OEM vs NVIDIA GeForce 845M
Graphics Processor
| GPU model | Cape Verde | GM107 |
|---|---|---|
| GPU variant | Cape Verde PRX | N15S-GT1R |
| Architecture | GCN 1.0 | Maxwell |
| Foundry | TSMC | TSMC |
| Manufacturing process | 28 nm | 28 nm |
| Number of transistors | 1,500 million | 1,870 million |
| Die size | 123 mm² | 148 mm² |
Graphics Card
| Release date | Dec 21st, 2013 | — |
|---|---|---|
| Generation | Volcanic Islands | — |
| Production | End-of-life | — |
| Interface | PCIe 3.0 x16 | — |
| Predecessor | Sea Islands | — |
| Successor | Pirate Islands | — |
Clocks
| Base clock | 900 MHz | — |
|---|---|---|
| Boost clock | 930 MHz | — |
| Memory clock | 1150 MHz 4.6 Gbps effective | 1001 MHz 2 Gbps effective |
| GPU clock | — | 863 MHz |
Memory Configuration
| Memory size | 2 GB | 2 GB |
|---|---|---|
| Memory type | GDDR5 | DDR3 |
| Memory bus width | 128 bit | 64 bit |
| Bandwidth | 73.60 GB/s | 16.02 GB/s |
Render Configuration
| Shading units | 512 | 512 |
|---|---|---|
| TMUs | 32 | 32 |
| ROPs | 16 | 16 |
| Compute units | 8 | — |
| Cache L1 | 16 KB (per CU) | 64 KB (per SMM) |
| Cache L2 | 256 KB | 1024 KB |
| SMM count | — | 4 |
Performance
| Pixel rate | 14.88 GPixel/s | 13.81 GPixel/s |
|---|---|---|
| Texture rate | 29.76 GTexel/s | 27.62 GTexel/s |
| FP32 (float) performance | 952.3 GFLOPS | 883.7 GFLOPS |
| FP64 (double) performance | 59.52 GFLOPS (1:16) | 27.62 GFLOPS (1:32) |
Dimensions & Outputs
| Slot width | Dual-slot | IGP |
|---|---|---|
| TDP | 65 W | 45 W |
| Suggested PSU | 250 W | — |
| Outputs | No outputs | No outputs |
| Power connectors | 1x 6-pin | — |
| Board number | C750 | — |
API Support & Features
| DirectX | 12 (11_1) | 12 (11_0) |
|---|---|---|
| OpenGL | 4.6 | 4.6 |
| OpenCL | 1.2 | 3.0 |
| Vulkan | 1.2 | 1.1 |
| Shader model | 5.1 | 5.1 |
| CUDA | — | 5.0 |
Other Features
Mobile graphics
| Release date | — | Feb 7th, 2015 |
|---|---|---|
| Generation | — | GeForce 800M |
| Production | — | End-of-life |
| Interface | — | PCIe 3.0 x16 |
| Predecessor | — | GeForce 700M |
| Successor | — | GeForce 900M |
