AMD Radeon HD 8670M vs ATI Radeon HD 3870 X2
Graphics Processor
| GPU model | Mars | R680 |
|---|---|---|
| GPU variant | Mars XT | R680 XT (215-0708017) |
| Architecture | GCN 1.0 | TeraScale |
| Foundry | TSMC | TSMC |
| Manufacturing process | 28 nm | 55 nm |
| Number of transistors | 950 million | 666 million |
| Die size | 77 mm² | 192 mm² |
Mobile graphics
| Release date | Mar 1st, 2013 | — |
|---|---|---|
| Generation | Solar System (HD 8600M) | — |
| Production | End-of-life | — |
| Interface | PCIe 3.0 x8 | — |
| Predecessor | London | — |
| Successor | Crystal System | — |
Clocks
| Base clock | 775 MHz | — |
|---|---|---|
| Boost clock | 825 MHz | — |
| Memory clock | 900 MHz 1800 Mbps effective | 901 MHz 1802 Mbps effective |
| GPU clock | — | 825 MHz |
Memory Configuration
| Memory size | 1024 MB | 512 MB |
|---|---|---|
| Memory type | DDR3 | GDDR3 |
| Memory bus width | 64 bit | 256 bit |
| Bandwidth | 14.40 GB/s | 57.66 GB/s |
Render Configuration
| Shading units | 384 | 320 |
|---|---|---|
| TMUs | 24 | 16 |
| ROPs | 8 | 16 |
| Compute units | 6 | 4 |
| Cache L1 | 16 KB (per CU) | — |
| Cache L2 | 128 KB | 256 KB |
Performance
| Pixel rate | 6.600 GPixel/s | 13.20 GPixel/s |
|---|---|---|
| Texture rate | 19.80 GTexel/s | 13.20 GTexel/s |
| FP32 (float) performance | 633.6 GFLOPS | 528.0 GFLOPS |
| FP64 (double) performance | — | 105.6 GFLOPS (1:5) |
Dimensions & Outputs
| TDP | unknown | 165 W |
|---|---|---|
| Outputs | No outputs | 2x DVI1x S-Video |
| Slot width | — | Dual-slot |
| Length | — | 267 mm 10.5 inches |
| Width | — | 113 mm 4.4 inches |
| Height | — | 39 mm 1.5 inches |
| Suggested PSU | — | 450 W |
| Power connectors | — | 1x 6-pin + 1x 8-pin |
| Board number | — | B400 |
API Support & Features
| DirectX | 12 (11_1) | 10.1 (10_1) |
|---|---|---|
| OpenGL | 4.6 | 3.3 (full) 4.0 (partial) |
| OpenCL | 1.2 | — |
| Vulkan | 1.2 | — |
| Shader model | 5.1 | 4.1 |
Other Features
Graphics Card
| Release date | — | Jan 26th, 2008 |
|---|---|---|
| Generation | — | Radeon R600 |
| Production | — | End-of-life |
| Launch price | — | 449 USD |
| Interface | — | PCIe 2.0 x16 |
| Reviews | — | 72 in our database |
| Predecessor | — | Radeon R500 PCIe |
| Successor | — | Radeon R700 |
