GeForce 8800 GTS 640 vs 7900 GTX
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | 1105 | not rated |
| Place by popularity | not in top-100 | not in top-100 |
| Power efficiency | 0.82 | no data |
| Architecture | Curie (2003−2013) | Tesla (2006−2010) |
| GPU code name | G71 | G80 |
| Market segment | Desktop | Desktop |
| Release date | 9 March 2006 (18 years ago) | 8 November 2006 (18 years ago) |
| Launch price (MSRP) | no data | $449 |
Detailed specifications
General parameters such as number of shaders, GPU core base clock and boost clock speeds, manufacturing process, texturing and calculation speed. Note that power consumption of some graphics cards can well exceed their nominal TDP, especially when overclocked.
| Pipelines / CUDA cores | no data | 96 |
| Core clock speed | 650 MHz | 513 MHz |
| Number of transistors | 278 million | 681 million |
| Manufacturing process technology | 90 nm | 90 nm |
| Power consumption (TDP) | 84 Watt | 143 Watt |
| Texture fill rate | 15.60 | 24.62 |
| Floating-point processing power | no data | 0.2281 TFLOPS |
| ROPs | 16 | 20 |
| TMUs | 24 | 24 |
Form factor & compatibility
Information on compatibility with other computer components. Useful when choosing a future computer configuration or upgrading an existing one. For desktop graphics cards it's interface and bus (motherboard compatibility), additional power connectors (power supply compatibility).
| Interface | PCIe 1.0 x16 | PCIe 1.0 x16 |
| Length | no data | 267 mm |
| Width | 1-slot | 2-slot |
| Supplementary power connectors | 1x 6-pin | 1x 6-pin |
VRAM capacity and type
Parameters of VRAM installed: its type, size, bus, clock and resulting bandwidth. Integrated GPUs have no dedicated video RAM and use a shared part of system RAM.
| Memory type | GDDR3 | GDDR3 |
| Maximum RAM amount | 512 MB | 640 MB |
| Memory bus width | 256 Bit | 320 Bit |
| Memory clock speed | 800 MHz | 792 MHz |
| Memory bandwidth | 51.2 GB/s | 63.36 GB/s |
Connectivity and outputs
Types and number of video connectors present on the reviewed GPUs. As a rule, data in this section is precise only for desktop reference ones (so-called Founders Edition for NVIDIA chips). OEM manufacturers may change the number and type of output ports, while for notebook cards availability of certain video outputs ports depends on the laptop model rather than on the card itself.
| Display Connectors | 2x DVI, 1x S-Video | 2x DVI, 1x S-Video |
API compatibility
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 9.0c (9_3) | 11.1 (10_0) |
| Shader Model | 3.0 | 4.0 |
| OpenGL | 2.1 | 3.3 |
| OpenCL | N/A | 1.1 |
| Vulkan | N/A | N/A |
| CUDA | - | + |
Pros & cons summary
| Recency | 9 March 2006 | 8 November 2006 |
| Maximum RAM amount | 512 MB | 640 MB |
| Power consumption (TDP) | 84 Watt | 143 Watt |
7900 GTX has 70.2% lower power consumption.
8800 GTS 640, on the other hand, has an age advantage of 7 months, and a 25% higher maximum VRAM amount.
We couldn't decide between GeForce 7900 GTX and GeForce 8800 GTS 640. We've got no test results to judge.
Should you still have questions concerning choice between the reviewed GPUs, ask them in Comments section, and we shall answer.
Comparisons with similar GPUs
We selected several comparisons of graphics cards with performance close to those reviewed, providing you with more options to consider.
