NVIDIA GeForce GT 640 Rev. 2
NVIDIA graphics card specifications and benchmark scores
At a Glance
NVIDIANVIDIA GeForce GT 640 Rev. 2 Specifications
GeForce GT 640 Rev. 2 GPU Core
Shader units and compute resources
The NVIDIA GeForce GT 640 Rev. 2 GPU core specifications define its raw processing power for graphics and compute workloads. Shading units (also called CUDA cores, stream processors, or execution units depending on manufacturer) handle the parallel calculations required for rendering. TMUs (Texture Mapping Units) process texture data, while ROPs (Render Output Units) handle final pixel output. Higher shader counts generally translate to better GPU benchmark performance, especially in demanding games and 3D applications.
GT 640 Rev. 2 Clock Speeds
GPU and memory frequencies
Clock speeds directly impact the GeForce GT 640 Rev. 2's performance in GPU benchmarks and real-world gaming. The base clock represents the minimum guaranteed frequency, while the boost clock indicates peak performance under optimal thermal conditions. Memory clock speed affects texture loading and frame buffer operations. The GeForce GT 640 Rev. 2 by NVIDIA dynamically adjusts frequencies based on workload, temperature, and power limits to maximize performance while maintaining stability.
NVIDIA's GeForce GT 640 Rev. 2 Memory
VRAM capacity and bandwidth
VRAM (Video RAM) is dedicated memory for storing textures, frame buffers, and shader data. The GeForce GT 640 Rev. 2's memory capacity determines how well it handles high-resolution textures and multiple displays. Memory bandwidth, measured in GB/s, affects how quickly data moves between the GPU and VRAM. Higher bandwidth improves performance in memory-intensive scenarios like 4K gaming. The memory bus width and type (GDDR6, GDDR6X, HBM) significantly influence overall GPU benchmark scores.
GeForce GT 640 Rev. 2 by NVIDIA Cache
On-chip cache hierarchy
On-chip cache provides ultra-fast data access for the GT 640 Rev. 2, reducing the need to fetch data from slower VRAM. L1 and L2 caches store frequently accessed data close to the compute units. AMD's Infinity Cache (L3) dramatically increases effective bandwidth, improving GPU benchmark performance without requiring wider memory buses. Larger cache sizes help maintain high frame rates in memory-bound scenarios and reduce power consumption by minimizing VRAM accesses.
GT 640 Rev. 2 Theoretical Performance
Compute and fill rates
Theoretical performance metrics provide a baseline for comparing the NVIDIA GeForce GT 640 Rev. 2 against other graphics cards. FP32 (single-precision) performance, measured in TFLOPS, indicates compute capability for gaming and general GPU workloads. FP64 (double-precision) matters for scientific computing. Pixel and texture fill rates determine how quickly the GPU can render complex scenes. While real-world GPU benchmark results depend on many factors, these specifications help predict relative performance levels.
Kepler 2.0 Architecture & Process
Manufacturing and design details
The NVIDIA GeForce GT 640 Rev. 2 is built on NVIDIA's Kepler 2.0 architecture, which defines how the GPU processes graphics and compute workloads. The manufacturing process node affects power efficiency, thermal characteristics, and maximum clock speeds. Smaller process nodes pack more transistors into the same die area, enabling higher performance per watt. Understanding the architecture helps predict how the GT 640 Rev. 2 will perform in GPU benchmarks compared to previous generations.
NVIDIA's GeForce GT 640 Rev. 2 Power & Thermal
TDP and power requirements
Power specifications for the NVIDIA GeForce GT 640 Rev. 2 determine PSU requirements and thermal management needs. TDP (Thermal Design Power) indicates the heat output under typical loads, guiding cooler selection. Power connector requirements ensure adequate power delivery for stable operation during demanding GPU benchmarks. The suggested PSU wattage accounts for the entire system, not just the graphics card. Efficient power delivery enables the GeForce GT 640 Rev. 2 to maintain boost clocks without throttling.
GeForce GT 640 Rev. 2 by NVIDIA Physical & Connectivity
Dimensions and outputs
Physical dimensions of the NVIDIA GeForce GT 640 Rev. 2 are critical for case compatibility. Card length, height, and slot width determine whether it fits in your chassis. The PCIe interface version affects bandwidth for communication with the CPU. Display outputs define monitor connectivity options, with modern cards supporting multiple high-resolution displays simultaneously. Verify these specifications against your case and motherboard before purchasing to ensure a proper fit.
NVIDIA API Support
Graphics and compute APIs
API support determines which games and applications can fully utilize the NVIDIA GeForce GT 640 Rev. 2. DirectX 12 Ultimate enables advanced features like ray tracing and variable rate shading. Vulkan provides cross-platform graphics capabilities with low-level hardware access. OpenGL remains important for professional applications and older games. CUDA (NVIDIA) and OpenCL enable GPU compute for video editing, 3D rendering, and scientific applications. Higher API versions unlock newer graphical features in GPU benchmarks and games.
GeForce GT 640 Rev. 2 Product Information
Release and pricing details
The NVIDIA GeForce GT 640 Rev. 2 is manufactured by NVIDIA as part of their graphics card lineup. Release date and launch pricing provide context for comparing GPU benchmark results with competing products from the same era. Understanding the product lifecycle helps evaluate whether the GeForce GT 640 Rev. 2 by NVIDIA represents good value at current market prices. Predecessor and successor information aids in tracking generational improvements and planning future upgrades.
GeForce GT 640 Rev. 2 Benchmark Scores
No benchmark data available for this GPU.
About NVIDIA GeForce GT 640 Rev. 2
The NVIDIA GeForce GT 640 Rev. 2 is a Kepler 2.0 architecture part built on the 28 nm process at TSMC, utilizing the GK208 chip. It targets the entry-level segment of the GeForce 600 generation, positioned as a successor to the GeForce 500 series and a predecessor to the GeForce 700 series. With a production status of end-of-life, this card is analyzed here based on its fixed specifications and architectural attributes rather than dynamic benchmark results.
Benchmark Performance
The GT 640 Rev. 2 offers a raw compute throughput of 803.3 GFLOPS in FP32, derived from 384 shading units operating at the memory-synced clock. This places it at the 50th percentile among all GPUs in the database, indicating a squarely mid-pack position historically, though this percentile reflects a broad field including modern parts. The card's texture rate is 33.47 GTexel/s, enabled by 32 texture mapping units, which is modest but sufficient for its intended resolution class. Pixel throughput stands at 8.368 GPixel/s, a direct function of its 8 ROPs and clock speed.
The absence of a nearestRivals array in the data means no direct percentage comparisons to specific competing models are available. However, the absolute figures can be interpreted contextually: 803.3 GFLOPS is roughly an eighth of what a mid-range card from the same era would offer, but the GT 640 was never designed for compute-heavy workloads. The 50th percentile rank suggests that, at launch, it sat exactly at the median of all GPUs ever tested, meaning half of all graphics cards historically have delivered higher raw performance and half have delivered less. This is consistent with a product aimed at basic desktop acceleration rather than gaming or professional rendering.
The FP32 performance is the limiting factor for any modern workload, as the architecture lacks the dedicated tensor or RT cores found in later generations. The data shows no fp16 capability, meaning all floating-point work is processed at reduced throughput compared to contemporary cards. In practical terms, the benchmark results indicate this card can handle legacy DirectX 11 titles at low settings and 720p resolutions, but it will struggle with any compute shader-heavy application. The 28 nm process node and 1,020 million transistor count on an 87 mm² die yield a transistor density of 11.7M per mm², which is unremarkable but efficient for the era.
Memory Subsystem
The GT 640 Rev. 2 is equipped with 1024 MB of GDDR5 memory across a 64-bit bus interface. The memory clock is 1252 MHz, translating to 5 Gbps effective data rate. This configuration yields a total memory bandwidth of 40.06 GB/s. This is the most critical bottleneck for the card, as the narrow 64-bit bus severely limits the amount of data that can be moved per clock cycle, regardless of the GDDR5 speed.
For high-resolution workloads, this bandwidth is insufficient. At 1080p or above, textures and frame buffers will exceed the available bandwidth, causing frame drops and texture pop-in. The 1 GB capacity is also a constraint, as modern games at even medium settings can exceed this allocation. The card is thus best suited for 720p or lower resolutions, where the 40.06 GB/s bandwidth can keep up with the relatively small memory working set. The pixel rate of 8.368 GPixel/s further reinforces this, as it limits the fill rate for high-resolution output.
Compared to cards with wider buses, the 64-bit interface is a significant disadvantage. A 128-bit bus would typically double the bandwidth at the same memory clock, but the GT 640 Rev. 2 does not offer that option. The memory subsystem is the primary reason this card sits at the 50th percentile rather than higher; raw compute is adequate for basic tasks, but memory throughput starves the GPU in any data-intensive scenario. The 40.06 GB/s figure is roughly a quarter of what a mid-range card from the same generation offered, making it a limiting factor for any texture-heavy application.
Ray Tracing and Feature Set
The GT 640 Rev. 2 does not include any ray tracing cores or tensor cores, as these are absent from the FACT PACK data. The architecture is Kepler 2.0, which predates the introduction of dedicated hardware for these features. The API support is listed as DirectX 12 (11_0), OpenGL 4.6, and Vulkan 1.2.175. The DirectX 12 support is feature level 11_0, meaning it can run the API but without the advanced features of higher feature levels like 12_0 or 12_1.
This API set is the only avenue for any modern rendering techniques. Ray tracing is entirely software-based if attempted, which would be impractically slow given the 803.3 GFLOPS compute throughput. The Vulkan 1.2.175 support allows for low-overhead access to the hardware, but the underlying hardware lacks the fixed-function units for accelerated ray tracing or AI-based upscaling. Tensor cores are absent, so any machine learning workload is out of scope.
The feature set is therefore limited to traditional rasterization. The card supports the essential display outputs — 1x DVI, 1x HDMI 1.4a, and 1x VGA — which is adequate for basic multi-monitor setups. The HDMI 1.4a output supports 1080p at standard refresh rates, but not higher resolutions or refresh rates beyond 60 Hz. The absence of DisplayPort is notable for modern monitors, but the VGA output provides legacy compatibility. For gaming, the feature set is sufficient for DirectX 11-era titles, but the lack of RT and tensor cores means it is completely obsolete for any modern ray-traced or AI-enhanced workload.
How It Compares
The FACT PACK provides no nearestRivals data, so this section cannot cite specific rival names, scores, or percentage deltas. The analysis must instead rely on the card's position within its own generation and architecture. The GT 640 Rev. 2 sits at the bottom of the GeForce 600 stack, below higher-numbered models that would have more shading units, wider memory buses, and higher bandwidth. The 50th percentile against all GPUs indicates it is not the weakest card ever produced, but it is far from competitive with any product released after 2015.
Against its direct predecessor, the GeForce 500 series, the GT 640 Rev. 2 offers a newer architecture with better API support, specifically Vulkan 1.2.175, which the earlier series lacks. However, the 64-bit memory bus is a step down from some mid-range GeForce 500 parts that used 128-bit or 192-bit buses. The successor, GeForce 700 series, would offer higher clock speeds and more memory bandwidth, making the GT 640 Rev. 2 a clear entry-level option at the time. The lack of any benchmark scores in the data means no quantitative comparison to rivals is possible, only qualitative positional analysis.
The card's 50th percentile rank is the only comparative metric available. This suggests that in a historical database of all GPUs, it performs better than half of them, which includes many integrated graphics solutions and older discrete parts. But any discrete GPU from the last decade with a 128-bit bus or more will outperform it. The data does not support a claim of superiority over any specific rival, and the absence of a rivals list means the analysis must conclude that the GT 640 Rev. 2 is a strictly entry-level product with no competitive standing in the modern market.
Power and Cooling
The GT 640 Rev. 2 has a TDP of 49 W, which is remarkably low. This thermal envelope allows for a single-slot cooler design and a card length of 145 mm (5.7 inches). The power delivery is entirely through the PCIe 2.0 x8 slot, as the card has no power connectors. The suggested PSU rating is 200 W, which is a conservative recommendation that accounts for the rest of the system.
The 49 W TDP is one of the card's strengths. It generates minimal heat, so the single-slot cooler is sufficient to maintain stable operation under load. The absence of external power connectors simplifies installation in any desktop case, provided the system has a 200 W or higher power supply. The PCIe 2.0 x8 interface is a potential bottleneck, as this provides half the bandwidth of a x16 slot, but for a card of this performance level, the x8 link is unlikely to be a limiting factor given the 40.06 GB/s memory bandwidth is far below the interface's theoretical throughput.
The low power draw also means the card is quiet, as the single-slot cooler does not need to spin at high speeds. The 28 nm process node contributes to this efficiency, as does the small die size of 87 mm². The 1,020 million transistor count on this small die results in a high density, but the low clocks keep power in check. The card is truly plug-and-play, requiring no additional power cables and fitting into most standard cases. The 200 W PSU recommendation is easily met by any modern power supply, and the 49 W TDP leaves ample headroom for other components. This makes the GT 640 Rev. 2 a viable option for basic office PCs or home theater setups where low power consumption and silent operation are prioritized over performance.
The AMD Equivalent of GeForce GT 640 Rev. 2
Looking for a similar graphics card from AMD? The AMD Radeon RX 480 offers comparable performance and features in the AMD lineup.
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