AMD Radeon HD 6770 vs AMD Radeon HD 7970
Graphics Processor
| GPU model | Juniper | Tahiti |
|---|---|---|
| GPU variant | Juniper XT (215-0754013) | Tahiti XT (215-0821060) |
| Architecture | TeraScale 2 | GCN 1.0 |
| Foundry | TSMC | TSMC |
| Manufacturing process | 40 nm | 28 nm |
| Number of transistors | 1,040 million | 4,313 million |
| Die size | 166 mm² | 352 mm² |
Graphics Card
| Release date | Jan 21st, 2011 | Dec 22nd, 2011 |
|---|---|---|
| Generation | Northern Islands | Southern Islands |
| Production | End-of-life | End-of-life |
| Launch price | 129 USD | 549 USD |
| Interface | PCIe 2.0 x16 | PCIe 3.0 x16 |
| Reviews | 35 in our database | 191 in our database |
| Predecessor | Evergreen | Northern Islands |
| Successor | Southern Islands | Sea Islands |
| gpu.details.availability | — | Jan 9th, 2012 |
Clocks
| GPU clock | 850 MHz | 925 MHz |
|---|---|---|
| Memory clock | 1200 MHz 4.8 Gbps effective | 1375 MHz 5.5 Gbps effective |
Memory Configuration
| Memory size | 1024 MB | 3 GB |
|---|---|---|
| Memory type | GDDR5 | GDDR5 |
| Memory bus width | 128 bit | 384 bit |
| Bandwidth | 76.80 GB/s | 264.0 GB/s |
Render Configuration
| Shading units | 800 | 2048 |
|---|---|---|
| TMUs | 40 | 128 |
| ROPs | 16 | 32 |
| Compute units | 10 | 32 |
| Cache L1 | 8 KB (per CU) | 16 KB (per CU) |
| Cache L2 | 256 KB | 768 KB |
Performance
| Pixel rate | 13.60 GPixel/s | 29.60 GPixel/s |
|---|---|---|
| Texture rate | 34.00 GTexel/s | 118.4 GTexel/s |
| FP32 (float) performance | 1,360 GFLOPS | 3.789 TFLOPS |
| FP64 (double) performance | — | 947.2 GFLOPS (1:4) |
Dimensions & Outputs
| Slot width | Dual-slot | Dual-slot |
|---|---|---|
| Length | 198 mm 7.8 inches | 275 mm 10.8 inches |
| TDP | 108 W | 250 W |
| Suggested PSU | 300 W | 600 W |
| Outputs | 2x DVI1x HDMI2x mini-DisplayPort | 1x DVI1x HDMI2x mini-DisplayPort |
| Power connectors | 1x 6-pin | 1x 6-pin + 1x 8-pin |
| Board number | C010 | C386-37 |
| Width | — | 111 mm 4.4 inches |
| Height | — | 38 mm 1.5 inches |
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 |
