NVIDIA GeForce 820A vs NVIDIA GeForce 8800 GTX
Graphics Processor
| GPU model | GF117 | G80 |
|---|---|---|
| GPU variant | N15V-GM | G80-300-A2 |
| Architecture | Fermi 2.0 | Tesla |
| Foundry | TSMC | TSMC |
| Manufacturing process | 28 nm | 90 nm |
| Number of transistors | 585 million | 681 million |
| Die size | 116 mm² | 484 mm² |
Mobile graphics
| Release date | Mar 17th, 2014 | — |
|---|---|---|
| Generation | GeForce 800A | — |
| Production | End-of-life | — |
| Interface | PCIe 2.0 x16 | — |
| Predecessor | GeForce 700A | — |
| Successor | GeForce 900A | — |
Clocks
| GPU clock | 775 MHz | 576 MHz |
|---|---|---|
| Shader clock | 1550 MHz | 1350 MHz |
| Memory clock | 900 MHz 1800 Mbps effective | 900 MHz 1800 Mbps effective |
Memory Configuration
| Memory size | 1024 MB | 768 MB |
|---|---|---|
| Memory type | DDR3 | GDDR3 |
| Memory bus width | 64 bit | 384 bit |
| Bandwidth | 14.40 GB/s | 86.40 GB/s |
Render Configuration
| Shading units | 96 | 128 |
|---|---|---|
| TMUs | 16 | 32 |
| ROPs | 8 | 24 |
| SM count | 2 | 16 |
| Cache L1 | 64 KB (per SM) | — |
| Cache L2 | 128 KB | 96 KB |
Performance
| Pixel rate | 3.100 GPixel/s | 13.82 GPixel/s |
|---|---|---|
| Texture rate | 12.40 GTexel/s | 36.86 GTexel/s |
| FP32 (float) performance | 297.6 GFLOPS | 345.6 GFLOPS |
| FP64 (double) performance | 24.80 GFLOPS (1:12) | — |
Dimensions & Outputs
| TDP | 15 W | 155 W |
|---|---|---|
| Outputs | No outputs | 2x DVI1x S-Video |
| Slot width | — | Dual-slot |
| Length | — | 270 mm 10.6 inches |
| Suggested PSU | — | 450 W |
| Power connectors | — | 2x 6-pin |
| Board number | — | P355 |
API Support & Features
| DirectX | 12 (11_0) | 11.1 (10_0) |
|---|---|---|
| OpenGL | 4.6 | 3.3 |
| OpenCL | 1.1 | 1.1 (1.0) |
| Vulkan | — | — |
| CUDA | 2.1 | 1.0 |
| Shader model | 5.1 | 4.0 |
Other Features
Graphics Card
| Release date | — | Nov 8th, 2006 |
|---|---|---|
| Generation | — | GeForce 8 |
| Production | — | End-of-life |
| Launch price | — | 599 USD |
| Interface | — | PCIe 1.0 x16 |
| Reviews | — | 73 in our database |
| Predecessor | — | GeForce 7 PCIe |
| Successor | — | GeForce 9 |
