AMD Radeon HD 6870 X2 vs AMD Radeon HD 7770 GHz Edition
Graphics Processor
| GPU model | Barts | Cape Verde |
|---|---|---|
| GPU variant | Barts XT (215-0798000) | Cape Verde XT |
| Architecture | TeraScale 2 | GCN 1.0 |
| Foundry | TSMC | TSMC |
| Manufacturing process | 40 nm | 28 nm |
| Number of transistors | 1,700 million | 1,500 million |
| Die size | 255 mm² | 123 mm² |
Graphics Card
| Release date | Jul 8th, 2011 | Feb 15th, 2012 |
|---|---|---|
| Generation | Northern Islands | Southern Islands |
| Production | End-of-life | End-of-life |
| Launch price | 520 USD | 159 USD |
| Interface | PCIe 2.0 x16 | PCIe 3.0 x16 |
| Reviews | 170 in our database | 97 in our database |
| Predecessor | Evergreen | Northern Islands |
| Successor | Southern Islands | Sea Islands |
Clocks
| GPU clock | 900 MHz | 1000 MHz |
|---|---|---|
| Memory clock | 1050 MHz 4.2 Gbps effective | 1125 MHz 4.5 Gbps effective |
Memory Configuration
| Memory size | 1024 MB | 1024 MB |
|---|---|---|
| Memory type | GDDR5 | GDDR5 |
| Memory bus width | 256 bit | 128 bit |
| Bandwidth | 134.4 GB/s | 72.00 GB/s |
Render Configuration
| Shading units | 1120 | 640 |
|---|---|---|
| TMUs | 56 | 40 |
| ROPs | 32 | 16 |
| Compute units | 14 | 10 |
| Cache L1 | 8 KB (per CU) | 16 KB (per CU) |
| Cache L2 | 512 KB | 256 KB |
Performance
| Pixel rate | 28.80 GPixel/s | 16.00 GPixel/s |
|---|---|---|
| Texture rate | 50.40 GTexel/s | 40.00 GTexel/s |
| FP32 (float) performance | 2.016 TFLOPS | 1,280 GFLOPS |
| FP64 (double) performance | — | 80.00 GFLOPS (1:16) |
Dimensions & Outputs
| Slot width | Dual-slot | Dual-slot |
|---|---|---|
| Length | 304 mm 12 inches | 210 mm 8.3 inches |
| TDP | 300 W | 80 W |
| Suggested PSU | 700 W | 250 W |
| Outputs | 2x DVI1x HDMI2x mini-DisplayPort | 1x DVI1x HDMI2x mini-DisplayPort |
| Power connectors | — | 1x 6-pin |
| Board number | — | C441, C468 |
API Support & Features
| DirectX | 11.2 (11_0) | 12 (11_1) |
|---|---|---|
| OpenGL | 4.4 | 4.6 |
| OpenCL | 1.2 | 1.2 |
| Vulkan | — | 1.2 |
| Shader model | 5.0 | 5.1 |
