ATI Radeon HD 4870 Mac Edition vs NVIDIA GeForce GTX 275 PhysX Edition
Graphics Processor
| GPU model | RV770 | G92B |
|---|---|---|
| GPU variant | RV770 XT Mac (215-0669080) | G92-421-B1 |
| Architecture | TeraScale | Tesla |
| Foundry | TSMC | TSMC |
| Manufacturing process | 55 nm | 55 nm |
| Number of transistors | 956 million | 754 million |
| Die size | 256 mm² | 260 mm² |
Graphics Card
| Release date | Jan 6th, 2009 | Feb 16th, 2010 |
|---|---|---|
| Generation | Radeon R700 | GeForce 200 |
| Production | End-of-life | End-of-life |
| Interface | PCIe 2.0 x16 | PCIe 2.0 x16 |
| Reviews | 135 in our database | 61 in our database |
| Predecessor | Radeon R600 | GeForce 9 |
| Successor | Evergreen | GeForce 400 |
Clocks
| GPU clock | 750 MHz | 633 MHz |
|---|---|---|
| Memory clock | 850 MHz 3.4 Gbps effective | 1134 MHz 2.3 Gbps effective |
| Shader clock | — | 1296 MHz |
Memory Configuration
| Memory size | 512 MB | 896 MB |
|---|---|---|
| Memory type | GDDR5 | GDDR3 |
| Memory bus width | 256 bit | 448 bit |
| Bandwidth | 108.8 GB/s | 127.0 GB/s |
Render Configuration
| Shading units | 800 | 240 |
|---|---|---|
| TMUs | 40 | 80 |
| ROPs | 16 | 28 |
| Compute units | 10 | — |
| Cache L1 | 16 KB (per CU) | — |
| Cache L2 | 256 KB | 224 KB |
| SM count | — | 30 |
Performance
| Pixel rate | 12.00 GPixel/s | 17.72 GPixel/s |
|---|---|---|
| Texture rate | 30.00 GTexel/s | 50.64 GTexel/s |
| FP32 (float) performance | 1,200 GFLOPS | 622.1 GFLOPS |
| FP64 (double) performance | 240.0 GFLOPS (1:5) | 77.76 GFLOPS (1:8) |
Dimensions & Outputs
| Slot width | Dual-slot | Dual-slot |
|---|---|---|
| Length | 250 mm 9.8 inches | 267 mm 10.5 inches |
| TDP | 150 W | 219 W |
| Suggested PSU | 450 W | 550 W |
| Outputs | 1x DVI1x mini-DisplayPort | 2x DVI |
| Power connectors | 2x 6-pin | 1x 6-pin + 1x 8-pin |
| Board number | B771 | — |
API Support & Features
| DirectX | 10.1 (10_1) | 11.1 (10_0) |
|---|---|---|
| OpenGL | 3.3 | 3.3 |
| OpenCL | 1.1 | 1.1 |
| Vulkan | — | — |
| Shader model | 4.1 | 4.0 |
| CUDA | — | 1.3 |
