AMD Radeon HD 6950 vs NVIDIA GeForce GTX 680
Graphics Processor
| GPU model | Cayman | GK104 |
|---|---|---|
| GPU variant | Cayman PRO (215-0807019) | GK104-400-A2 |
| Architecture | TeraScale 3 | Kepler |
| Foundry | TSMC | TSMC |
| Manufacturing process | 40 nm | 28 nm |
| Number of transistors | 2,640 million | 3,540 million |
| Die size | 389 mm² | 294 mm² |
Graphics Card
| Release date | Dec 14th, 2010 | Mar 22nd, 2012 |
|---|---|---|
| Generation | Northern Islands | GeForce 600 |
| Production | End-of-life | End-of-life |
| Launch price | 299 USD | 499 USD |
| Interface | PCIe 2.0 x16 | PCIe 3.0 x16 |
| Reviews | 111 in our database | 151 in our database |
| Predecessor | Evergreen | GeForce 500 |
| Successor | Southern Islands | GeForce 700 |
Clocks
| GPU clock | 800 MHz | — |
|---|---|---|
| Memory clock | 1250 MHz 5 Gbps effective | 1502 MHz 6 Gbps effective |
| Base clock | — | 1006 MHz |
| Boost clock | — | 1058 MHz |
Memory Configuration
| Memory size | 2 GB | 2 GB |
|---|---|---|
| Memory type | GDDR5 | GDDR5 |
| Memory bus width | 256 bit | 256 bit |
| Bandwidth | 160.0 GB/s | 192.3 GB/s |
Render Configuration
| Shading units | 1408 | 1536 |
|---|---|---|
| TMUs | 88 | 128 |
| ROPs | 32 | 32 |
| Compute units | 22 | — |
| Cache L1 | 8 KB (per CU) | 16 KB (per SMX) |
| Cache L2 | 512 KB | 512 KB |
| SMX count | — | 8 |
Performance
| Pixel rate | 25.60 GPixel/s | 33.86 GPixel/s |
|---|---|---|
| Texture rate | 70.40 GTexel/s | 135.4 GTexel/s |
| FP32 (float) performance | 2.253 TFLOPS | 3.250 TFLOPS |
| FP64 (double) performance | 563.2 GFLOPS (1:4) | 135.4 GFLOPS (1:24) |
Dimensions & Outputs
| Slot width | Dual-slot | Dual-slot |
|---|---|---|
| Length | 286 mm 11.3 inches | 256 mm 10.1 inches |
| Width | 126 mm 5 inches | 111 mm 4.4 inches |
| Height | 42 mm 1.7 inches | 38 mm 1.5 inches |
| TDP | 200 W | 195 W |
| Suggested PSU | 550 W | 450 W |
| Outputs | 2x DVI1x HDMI2x mini-DisplayPort | 2x DVI1x HDMI1x DisplayPort |
| Power connectors | 2x 6-pin | 2x 6-pin |
| Board number | C216-47 | P2002 |
API Support & Features
| DirectX | 11.2 (11_0) | 12 (11_0) |
|---|---|---|
| OpenGL | 4.4 | 4.6 |
| OpenCL | 1.2 | 3.0 |
| Vulkan | — | 1.1 |
| Shader model | 5.0 | 5.1 |
| CUDA | — | 3.0 |
