AMD Radeon HD 8790M vs ATI Mobility Radeon HD 4870 X2
Graphics Processor
| GPU model | Mars | M98 |
|---|---|---|
| GPU variant | Mars XTX | M98 XT (216-0732023) |
| Architecture | GCN 1.0 | TeraScale |
| Foundry | TSMC | TSMC |
| Manufacturing process | 28 nm | 55 nm |
| Number of transistors | 950 million | 956 million |
| Die size | 77 mm² | 256 mm² |
Mobile graphics
| Release date | Apr 1st, 2013 | Jan 9th, 2009 |
|---|---|---|
| Generation | Solar System (HD 8700M) | M9x (Mobility HD 4800) |
| Production | End-of-life | End-of-life |
| Interface | MXM-A (3.0) | PCIe 2.0 x16 |
| Predecessor | London | M8x |
| Successor | Crystal System | Manhattan |
| Reviews | — | 2 in our database |
Clocks
| Base clock | 850 MHz | — |
|---|---|---|
| Boost clock | 900 MHz | — |
| Memory clock | 1000 MHz 4 Gbps effective | 700 MHz 2.8 Gbps effective |
| GPU clock | — | 550 MHz |
Memory Configuration
| Memory size | 2 GB | 1024 MB |
|---|---|---|
| Memory type | GDDR5 | GDDR5 |
| Memory bus width | 128 bit | 256 bit |
| Bandwidth | 64.00 GB/s | 89.60 GB/s |
Render Configuration
| Shading units | 384 | 800 |
|---|---|---|
| TMUs | 24 | 40 |
| ROPs | 8 | 16 |
| Compute units | 6 | 10 |
| Cache L1 | 16 KB (per CU) | 16 KB (per CU) |
| Cache L2 | 256 KB | 256 KB |
Performance
| Pixel rate | 7.200 GPixel/s | 8.800 GPixel/s |
|---|---|---|
| Texture rate | 21.60 GTexel/s | 22.00 GTexel/s |
| FP32 (float) performance | 691.2 GFLOPS | 880.0 GFLOPS |
| FP64 (double) performance | 43.20 GFLOPS (1:16) | 176.0 GFLOPS (1:5) |
Dimensions & Outputs
| Slot width | MXM Module | — |
|---|---|---|
| TDP | unknown | unknown |
| Outputs | No outputs | No outputs |
| Power connectors | None | — |
| Board number | C615 | — |
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 |
