ATI Radeon HD 4870 Mac Edition vs Intel Iris Plus Graphics 640
Graphics Processor
| GPU model | RV770 | Kaby Lake GT3e |
|---|---|---|
| GPU variant | RV770 XT Mac (215-0669080) | — |
| Architecture | TeraScale | Generation 9.5 |
| Foundry | TSMC | Intel |
| Manufacturing process | 55 nm | 14 nm++ |
| Number of transistors | 956 million | unknown |
| Die size | 256 mm² | unknown |
Graphics Card
| Release date | Jan 6th, 2009 | — |
|---|---|---|
| Generation | Radeon R700 | — |
| Production | End-of-life | — |
| Interface | PCIe 2.0 x16 | — |
| Reviews | 135 in our database | — |
| Predecessor | Radeon R600 | — |
| Successor | Evergreen | — |
Clocks
| GPU clock | 750 MHz | — |
|---|---|---|
| Memory clock | 850 MHz 3.4 Gbps effective | System Shared |
| Base clock | — | 300 MHz |
| Boost clock | — | 1100 MHz |
Memory Configuration
| Memory size | 512 MB | System Shared |
|---|---|---|
| Memory type | GDDR5 | System Shared |
| Memory bus width | 256 bit | System Shared |
| Bandwidth | 108.8 GB/s | System Dependent |
Render Configuration
| Shading units | 800 | 384 |
|---|---|---|
| TMUs | 40 | 48 |
| ROPs | 16 | 6 |
| Compute units | 10 | — |
| Cache L1 | 16 KB (per CU) | — |
| Cache L2 | 256 KB | — |
| Execution units | — | 48 |
Performance
| Pixel rate | 12.00 GPixel/s | 6.600 GPixel/s |
|---|---|---|
| Texture rate | 30.00 GTexel/s | 52.80 GTexel/s |
| FP32 (float) performance | 1,200 GFLOPS | 844.8 GFLOPS |
| FP64 (double) performance | 240.0 GFLOPS (1:5) | 211.2 GFLOPS (1:4) |
| FP16 (half) performance | — | 1.690 TFLOPS (2:1) |
Dimensions & Outputs
| Slot width | Dual-slot | IGP |
|---|---|---|
| Length | 250 mm 9.8 inches | — |
| TDP | 150 W | 15 W |
| Suggested PSU | 450 W | — |
| Outputs | 1x DVI1x mini-DisplayPort | No outputs |
| Power connectors | 2x 6-pin | — |
| Board number | B771 | — |
API Support & Features
| DirectX | 10.1 (10_1) | 12 (12_1) |
|---|---|---|
| OpenGL | 3.3 | 4.6 |
| OpenCL | 1.1 | 3.0 |
| Vulkan | — | 1.2 |
| Shader model | 4.1 | 6.4 |
Other Features
Integrated Graphics
| Release date | — | Jan 3rd, 2017 |
|---|---|---|
| Generation | — | HD Graphics-M (Kaby Lake) |
| Production | — | Active |
| Interface | — | Ring Bus |
| Reviews | — | 1 in our database |
