NVIDIA GeForce 7900 GX2 vs NVIDIA GeForce GT 620
Graphics Processor
| GPU model | G71 | GF108 |
|---|---|---|
| Architecture | Curie | Fermi |
| Foundry | TSMC | TSMC |
| Manufacturing process | 90 nm | 40 nm |
| Number of transistors | 278 million | 585 million |
| Die size | 196 mm² | 116 mm² |
| GPU variant | — | GF108-100-KB-A1 |
Graphics Card
| Release date | Apr 30th, 2006 | May 15th, 2012 |
|---|---|---|
| Generation | GeForce 7 PCIe | GeForce 600 |
| Production | End-of-life | End-of-life |
| Launch price | 599 USD | — |
| Interface | PCIe 1.0 x16 | PCIe 2.0 x16 |
| Reviews | 145 in our database | — |
| Predecessor | GeForce 6 PCIe | GeForce 500 |
| Successor | GeForce 8 | GeForce 700 |
Clocks
| GPU clock | 500 MHz | 700 MHz |
|---|---|---|
| Memory clock | 600 MHz 1200 Mbps effective | 900 MHz 1800 Mbps effective |
| Shader clock | — | 1400 MHz |
Memory Configuration
| Memory size | 512 MB | 1024 MB |
|---|---|---|
| Memory type | GDDR3 | DDR3 |
| Memory bus width | 256 bit | 64 bit |
| Bandwidth | 38.40 GB/s | 14.40 GB/s |
Render Configuration
| Pixel shaders | 24 | — |
|---|---|---|
| Vertex shaders | 8 | — |
| TMUs | 24 | 16 |
| ROPs | 16 | 4 |
| Shading units | — | 96 |
| SM count | — | 2 |
| Cache L1 | — | 64 KB (per SM) |
| Cache L2 | — | 128 KB |
Performance
| Pixel rate | 8.000 GPixel/s | 2.800 GPixel/s |
|---|---|---|
| Vertex rate | 1.000 GVertices/s | — |
| Texture rate | 12.00 GTexel/s | 11.20 GTexel/s |
| FP32 (float) performance | — | 268.8 GFLOPS |
| FP64 (double) performance | — | 22.40 GFLOPS (1:12) |
Dimensions & Outputs
| Slot width | Dual-slot | Single-slot |
|---|---|---|
| Length | 312 mm 12.3 inches | 145 mm 5.7 inches |
| TDP | 110 W | 49 W |
| Suggested PSU | 300 W | 200 W |
| Outputs | 2x DVI1x S-Video | 1x DVI1x HDMI1x VGA |
| Power connectors | 2x 6-pin | None |
| Board number | P278, P378 | P1071 |
API Support & Features
| DirectX | 9.0c (9_3) | 12 (11_0) |
|---|---|---|
| OpenGL | 2.1 | 4.6 |
| OpenCL | — | 1.1 |
| Vulkan | — | — |
| Shader model | 3.0 | 5.1 |
| CUDA | — | 2.1 |
