ATI Radeon HD 4870 Mac Edition vs ATI Radeon HD 5770
Graphics Processor
| GPU model | RV770 | Juniper |
|---|---|---|
| GPU variant | RV770 XT Mac (215-0669080) | Juniper XT (215-0754013) |
| Architecture | TeraScale | TeraScale 2 |
| Foundry | TSMC | TSMC |
| Manufacturing process | 55 nm | 40 nm |
| Number of transistors | 956 million | 1,040 million |
| Die size | 256 mm² | 166 mm² |
Graphics Card
| Release date | Jan 6th, 2009 | Oct 13th, 2009 |
|---|---|---|
| Generation | Radeon R700 | Evergreen |
| Production | End-of-life | End-of-life |
| Interface | PCIe 2.0 x16 | PCIe 2.0 x16 |
| Reviews | 135 in our database | 142 in our database |
| Predecessor | Radeon R600 | Radeon R700 |
| Successor | Evergreen | Northern Islands |
| Launch price | — | 159 USD |
Clocks
| GPU clock | 750 MHz | 850 MHz |
|---|---|---|
| Memory clock | 850 MHz 3.4 Gbps effective | 1200 MHz 4.8 Gbps effective |
Memory Configuration
| Memory size | 512 MB | 1024 MB |
|---|---|---|
| Memory type | GDDR5 | GDDR5 |
| Memory bus width | 256 bit | 128 bit |
| Bandwidth | 108.8 GB/s | 76.80 GB/s |
Render Configuration
| Shading units | 800 | 800 |
|---|---|---|
| TMUs | 40 | 40 |
| ROPs | 16 | 16 |
| Compute units | 10 | 10 |
| Cache L1 | 16 KB (per CU) | 8 KB (per CU) |
| Cache L2 | 256 KB | 256 KB |
Performance
| Pixel rate | 12.00 GPixel/s | 13.60 GPixel/s |
|---|---|---|
| Texture rate | 30.00 GTexel/s | 34.00 GTexel/s |
| FP32 (float) performance | 1,200 GFLOPS | 1,360 GFLOPS |
| FP64 (double) performance | 240.0 GFLOPS (1:5) | — |
Dimensions & Outputs
| Slot width | Dual-slot | Dual-slot |
|---|---|---|
| Length | 250 mm 9.8 inches | 208 mm 8.2 inches |
| TDP | 150 W | 108 W |
| Suggested PSU | 450 W | 300 W |
| Outputs | 1x DVI1x mini-DisplayPort | 2x DVI1x HDMI1x DisplayPort |
| Power connectors | 2x 6-pin | 1x 6-pin |
| Board number | B771 | C010 |
API Support & Features
| DirectX | 10.1 (10_1) | 11.2 (11_0) |
|---|---|---|
| OpenGL | 3.3 | 4.4 |
| OpenCL | 1.1 | 1.2 |
| Vulkan | — | — |
| Shader model | 4.1 | 5.0 |
