AMD Radeon HD 7670 OEM vs AMD Radeon R9 255 OEM
Graphics Processor
| GPU model | Turks | Cape Verde |
|---|---|---|
| GPU variant | Turks XT (215-0803000) | Cape Verde PRX |
| Architecture | TeraScale 2 | GCN 1.0 |
| Foundry | TSMC | TSMC |
| Manufacturing process | 40 nm | 28 nm |
| Number of transistors | 716 million | 1,500 million |
| Die size | 118 mm² | 123 mm² |
Graphics Card
| Release date | Jan 5th, 2012 | Dec 21st, 2013 |
|---|---|---|
| Generation | Southern Islands | Volcanic Islands |
| Production | End-of-life | End-of-life |
| Interface | PCIe 2.0 x16 | PCIe 3.0 x16 |
| Predecessor | Northern Islands | Sea Islands |
| Successor | Sea Islands | Pirate Islands |
Clocks
| GPU clock | 800 MHz | — |
|---|---|---|
| Memory clock | 1000 MHz 4 Gbps effective | 1150 MHz 4.6 Gbps effective |
| Base clock | — | 900 MHz |
| Boost clock | — | 930 MHz |
Memory Configuration
| Memory size | 512 MB | 2 GB |
|---|---|---|
| Memory type | GDDR5 | GDDR5 |
| Memory bus width | 128 bit | 128 bit |
| Bandwidth | 64.00 GB/s | 73.60 GB/s |
Render Configuration
| Shading units | 480 | 512 |
|---|---|---|
| TMUs | 24 | 32 |
| ROPs | 8 | 16 |
| Compute units | 6 | 8 |
| Cache L1 | 8 KB (per CU) | 16 KB (per CU) |
| Cache L2 | 256 KB | 256 KB |
Performance
| Pixel rate | 6.400 GPixel/s | 14.88 GPixel/s |
|---|---|---|
| Texture rate | 19.20 GTexel/s | 29.76 GTexel/s |
| FP32 (float) performance | 768.0 GFLOPS | 952.3 GFLOPS |
| FP64 (double) performance | — | 59.52 GFLOPS (1:16) |
Dimensions & Outputs
| Slot width | Single-slot | Dual-slot |
|---|---|---|
| Length | 145 mm 5.7 inches | — |
| TDP | 66 W | 65 W |
| Suggested PSU | 250 W | 250 W |
| Outputs | 1x DVI1x DisplayPort1x VGA | No outputs |
| Power connectors | None | 1x 6-pin |
| Board number | C243, C331, C337 | C750 |
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 |
