AMD Radeon HD 7870M vs ATI Radeon HD 4890
Graphics Processor
| GPU model | Heathrow | RV790 |
|---|---|---|
| GPU variant | Heathrow XT (216-0835033) | RV790 XT (215-0758016) |
| Architecture | GCN 1.0 | TeraScale |
| Foundry | TSMC | TSMC |
| Manufacturing process | 28 nm | 55 nm |
| Number of transistors | 1,500 million | 959 million |
| Die size | 123 mm² | 282 mm² |
Mobile graphics
| Release date | Apr 24th, 2012 | — |
|---|---|---|
| Generation | London (HD 7800M) | — |
| Production | End-of-life | — |
| Interface | PCIe 3.0 x16 | — |
| Predecessor | Vancouver | — |
| Successor | Solar System | — |
Clocks
| GPU clock | 800 MHz | 850 MHz |
|---|---|---|
| Memory clock | 1000 MHz 4 Gbps effective | 975 MHz 3.9 Gbps effective |
Memory Configuration
| Memory size | 2 GB | 1024 MB |
|---|---|---|
| Memory type | GDDR5 | GDDR5 |
| Memory bus width | 128 bit | 256 bit |
| Bandwidth | 64.00 GB/s | 124.8 GB/s |
Render Configuration
| Shading units | 640 | 800 |
|---|---|---|
| TMUs | 40 | 40 |
| ROPs | 16 | 16 |
| Compute units | 10 | 10 |
| Cache L1 | 16 KB (per CU) | 16 KB (per CU) |
| Cache L2 | 256 KB | 256 KB |
Performance
| Pixel rate | 12.80 GPixel/s | 13.60 GPixel/s |
|---|---|---|
| Texture rate | 32.00 GTexel/s | 34.00 GTexel/s |
| FP32 (float) performance | 1,024 GFLOPS | 1,360 GFLOPS |
| FP64 (double) performance | 64.00 GFLOPS (1:16) | 272.0 GFLOPS (1:5) |
Dimensions & Outputs
| TDP | 45 W | 190 W |
|---|---|---|
| Outputs | No outputs | 2x DVI1x S-Video |
| Slot width | — | Dual-slot |
| Length | — | 241 mm 9.5 inches |
| Width | — | 111 mm 4.4 inches |
| Height | — | 40 mm 1.6 inches |
| Suggested PSU | — | 450 W |
| Power connectors | — | 2x 6-pin |
| Board number | — | B790-31 |
API Support & Features
| DirectX | 12 (11_1) | 10.1 (10_1) |
|---|---|---|
| OpenGL | 4.6 | 3.3 |
| OpenCL | 1.2 | 1.1 |
| Vulkan | 1.2 | — |
| Shader model | 5.1 | 4.1 |
Other Features
Graphics Card
| Release date | — | Apr 2nd, 2009 |
|---|---|---|
| Generation | — | Radeon R700 |
| Production | — | End-of-life |
| Launch price | — | 249 USD |
| Interface | — | PCIe 2.0 x16 |
| Reviews | — | 114 in our database |
| Predecessor | — | Radeon R600 |
| Successor | — | Evergreen |
