AMD Radeon HD 6850 X2 vs AMD Radeon HD 6950
Graphics Processor
| GPU model | Barts | Cayman |
|---|---|---|
| GPU variant | Barts PRO (215-0798006) | Cayman PRO (215-0807019) |
| Architecture | TeraScale 2 | TeraScale 3 |
| Foundry | TSMC | TSMC |
| Manufacturing process | 40 nm | 40 nm |
| Number of transistors | 1,700 million | 2,640 million |
| Die size | 255 mm² | 389 mm² |
Graphics Card
| Release date | Sep 19th, 2011 | Dec 14th, 2010 |
|---|---|---|
| Generation | Northern Islands | Northern Islands |
| Production | End-of-life | End-of-life |
| Interface | PCIe 2.0 x16 | PCIe 2.0 x16 |
| Reviews | 105 in our database | 111 in our database |
| Predecessor | Evergreen | Evergreen |
| Successor | Southern Islands | Southern Islands |
| Launch price | — | 299 USD |
Clocks
| GPU clock | 800 MHz | 800 MHz |
|---|---|---|
| Memory clock | 1050 MHz 4.2 Gbps effective | 1250 MHz 5 Gbps effective |
Memory Configuration
| Memory size | 2 GB | 2 GB |
|---|---|---|
| Memory type | GDDR5 | GDDR5 |
| Memory bus width | 256 bit | 256 bit |
| Bandwidth | 134.4 GB/s | 160.0 GB/s |
Render Configuration
| Shading units | 960 | 1408 |
|---|---|---|
| TMUs | 48 | 88 |
| ROPs | 32 | 32 |
| Compute units | 12 | 22 |
| Cache L1 | 8 KB (per CU) | 8 KB (per CU) |
| Cache L2 | 512 KB | 512 KB |
Performance
| Pixel rate | 25.60 GPixel/s | 25.60 GPixel/s |
|---|---|---|
| Texture rate | 38.40 GTexel/s | 70.40 GTexel/s |
| FP32 (float) performance | 1.536 TFLOPS | 2.253 TFLOPS |
| FP64 (double) performance | — | 563.2 GFLOPS (1:4) |
Dimensions & Outputs
| Slot width | Dual-slot | Dual-slot |
|---|---|---|
| TDP | 254 W | 200 W |
| Suggested PSU | 600 W | 550 W |
| Outputs | 2x DVI1x HDMI1x DisplayPort | 2x DVI1x HDMI2x mini-DisplayPort |
| Power connectors | 2x 8-pin | 2x 6-pin |
| Length | — | 286 mm 11.3 inches |
| Width | — | 126 mm 5 inches |
| Height | — | 42 mm 1.7 inches |
| Board number | — | C216-47 |
API Support & Features
| DirectX | 11.2 (11_0) | 11.2 (11_0) |
|---|---|---|
| OpenGL | 4.4 | 4.4 |
| OpenCL | 1.2 | 1.2 |
| Vulkan | — | — |
| Shader model | 5.0 | 5.0 |
