AMD Radeon HD 7970 vs AMD Radeon R9 M395 Mac Edition
Graphics Processor
| GPU model | Tahiti | Amethyst |
|---|---|---|
| GPU variant | Tahiti XT (215-0821060) | Amethyst PRO (216-0872004) |
| Architecture | GCN 1.0 | GCN 3.0 |
| Foundry | TSMC | TSMC |
| Manufacturing process | 28 nm | 28 nm |
| Number of transistors | 4,313 million | 5,000 million |
| Die size | 352 mm² | 366 mm² |
Graphics Card
| Release date | Dec 22nd, 2011 | — |
|---|---|---|
| Generation | Southern Islands | — |
| Production | End-of-life | — |
| Launch price | 549 USD | — |
| Interface | PCIe 3.0 x16 | — |
| Reviews | 191 in our database | — |
| gpu.details.availability | Jan 9th, 2012 | — |
| Predecessor | Northern Islands | — |
| Successor | Sea Islands | — |
Clocks
| GPU clock | 925 MHz | 834 MHz |
|---|---|---|
| Memory clock | 1375 MHz 5.5 Gbps effective | 1365 MHz 5.5 Gbps effective |
Memory Configuration
| Memory size | 3 GB | 2 GB |
|---|---|---|
| Memory type | GDDR5 | GDDR5 |
| Memory bus width | 384 bit | 256 bit |
| Bandwidth | 264.0 GB/s | 174.7 GB/s |
Render Configuration
| Shading units | 2048 | 1792 |
|---|---|---|
| TMUs | 128 | 112 |
| ROPs | 32 | 32 |
| Compute units | 32 | 28 |
| Cache L1 | 16 KB (per CU) | — |
| Cache L2 | 768 KB | — |
Performance
| Pixel rate | 29.60 GPixel/s | 26.69 GPixel/s |
|---|---|---|
| Texture rate | 118.4 GTexel/s | 93.41 GTexel/s |
| FP32 (float) performance | 3.789 TFLOPS | 2.989 TFLOPS |
| FP64 (double) performance | 947.2 GFLOPS (1:4) | 373.6 GFLOPS (1:8) |
Dimensions & Outputs
| Slot width | Dual-slot | MXM Module |
|---|---|---|
| Length | 275 mm 10.8 inches | — |
| Width | 111 mm 4.4 inches | — |
| Height | 38 mm 1.5 inches | — |
| TDP | 250 W | 250 W |
| Suggested PSU | 600 W | — |
| Outputs | 1x DVI1x HDMI2x mini-DisplayPort | No outputs |
| Power connectors | 1x 6-pin + 1x 8-pin | None |
| Board number | C386-37 | — |
API Support & Features
| DirectX | 12 (11_1) | 12 (12_0) |
|---|---|---|
| OpenGL | 4.6 | 4.6 |
| OpenCL | 1.2 | 2.0 |
| Vulkan | 1.2 | 1.2 |
| Shader model | 5.1 | 6.3 |
Other Features
Mobile graphics
| Release date | — | May 5th, 2015 |
|---|---|---|
| Generation | — | Crystal System (R9 M300) |
| Production | — | End-of-life |
| Interface | — | MXM-B (3.0) |
| Predecessor | — | Solar System |
| Successor | — | Mobility Radeon |
