NVIDIA GeForce GT 645 OEM
NVIDIA graphics card specifications and benchmark scores
At a Glance
NVIDIANVIDIA GeForce GT 645 OEM Specifications
GeForce GT 645 OEM GPU Core
Shader units and compute resources
The NVIDIA GeForce GT 645 OEM 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 645 OEM Clock Speeds
GPU and memory frequencies
Clock speeds directly impact the GeForce GT 645 OEM'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 645 OEM by NVIDIA dynamically adjusts frequencies based on workload, temperature, and power limits to maximize performance while maintaining stability.
NVIDIA's GeForce GT 645 OEM Memory
VRAM capacity and bandwidth
VRAM (Video RAM) is dedicated memory for storing textures, frame buffers, and shader data. The GeForce GT 645 OEM'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 645 OEM by NVIDIA Cache
On-chip cache hierarchy
On-chip cache provides ultra-fast data access for the GT 645 OEM, 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 645 OEM Theoretical Performance
Compute and fill rates
Theoretical performance metrics provide a baseline for comparing the NVIDIA GeForce GT 645 OEM 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.
Fermi 2.0 Architecture & Process
Manufacturing and design details
The NVIDIA GeForce GT 645 OEM is built on NVIDIA's Fermi 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 645 OEM will perform in GPU benchmarks compared to previous generations.
NVIDIA's GeForce GT 645 OEM Power & Thermal
TDP and power requirements
Power specifications for the NVIDIA GeForce GT 645 OEM 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 645 OEM to maintain boost clocks without throttling.
GeForce GT 645 OEM by NVIDIA Physical & Connectivity
Dimensions and outputs
Physical dimensions of the NVIDIA GeForce GT 645 OEM 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 645 OEM. 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 645 OEM Product Information
Release and pricing details
The NVIDIA GeForce GT 645 OEM 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 645 OEM by NVIDIA represents good value at current market prices. Predecessor and successor information aids in tracking generational improvements and planning future upgrades.
GeForce GT 645 OEM Benchmark Scores
No benchmark data available for this GPU.
About NVIDIA GeForce GT 645 OEM
Who Should Consider It
The NVIDIA GeForce GT 645 OEM is a 2012-era graphics card built on the Fermi 2.0 architecture with a 40 nm TSMC process. The benchmark data places it at the 50th percentile of all GPUs, meaning it sits exactly at the median of the performance distribution. This is not a card for high-refresh-rate gaming or for driving modern titles at maximum detail settings; rather, it targets users whose workloads are modest and whose expectations align with 1080p-class gaming at medium to low presets.
The card’s 1024 MB of GDDR5 memory on a 192-bit bus yields 91.87 GB/s of bandwidth. That figure is sufficient for older DirectX 11-era games and for esports titles that are not memory-hungry. The 288 shading units and 24 ROPs deliver a pixel rate of 9.312 GPixel/s and a texture rate of 37.25 GTexel/s. In practice, this means the card can handle 1080p resolution in less demanding games, but users should plan for reduced texture quality and lower draw distances. At 1440p or higher, the frame rates will likely drop below playable thresholds in most 3D applications. A 50th percentile rank suggests that half of all GPUs in the benchmark database outperform it, so it is best suited for secondary PCs, HTPC builds, or as a stop-gap solution for light gaming.
For users running legacy software, the card supports DirectX 12 (11_0) and OpenGL 4.6, which covers a wide range of older applications. The 40 nm process and 1,950 million transistors on a 332 mm² die mean the card is not power-sipping by modern standards, but it is also not a power-hungry monster. The 102 W TDP is modest enough for basic desktop systems, but the dual-slot cooler means case airflow should be reasonable. In summary, this is a card for someone who needs basic 3D acceleration, plays older or undemanding games at 1080p, and does not expect to run recent AAA releases.
How It Compares
The FACT PACK lists no nearest rivals for the GeForce GT 645 OEM. Consequently, a direct performance comparison against specific competing GPUs cannot be made from the available data. The only positional reference is the 50th percentile rank, which indicates that the card is squarely in the middle of the performance spectrum for all GPUs in the benchmark database. Without rival scores or deltaPct values, no quantitative statements about relative performance can be made. Benchmark results indicate that the card’s average score is zero, which is an artifact of the data set rather than a meaningful performance metric. The absence of rival data means the card’s position must be inferred from its absolute specifications: 894.0 GFLOPS FP32 performance, 91.87 GB/s memory bandwidth, and 24 ROPs. These figures place it in the lower-middle tier of GPUs from its era, but no specific rival can be cited as being ahead or behind by a given percentage.
The card’s predecessor is the GeForce 500 series, and its successor is the GeForce 700 series, per the FACT PACK. This generational context suggests that the GT 645 OEM was an OEM-only part, likely used in pre-built systems, and it would have been positioned against entry-level cards of its own time. However, since no rival names or scores are provided, the analysis must stop at qualitative statements: the card is a mid-pack performer at the 50th percentile, and its architecture (Fermi 2.0) is older than what modern users would encounter.
Power and Cooling
The NVIDIA GeForce GT 645 OEM has a thermal design power (TDP) of 102 W. This is a relatively low figure for a dual-slot card, indicating that the cooling solution does not need to be elaborate. The FACT PACK does not specify the power connector type, so the card may rely solely on the PCIe slot power delivery, though that cannot be confirmed from the data. The suggested power supply rating is 300 W, which is a modest requirement and should be met by most standard desktop power supplies from the era. Users with modern power supplies will have no issue, as even a low-end 300 W PSU provides sufficient headroom for this card when paired with a typical CPU.
The card’s slot width is dual-slot, meaning it occupies two expansion brackets in a PC case. The physical length is 210 mm or 8.3 inches, which is standard for a card of this class and should fit in most mid-tower cases. The bus interface is PCIe 2.0 x16, which is backward compatible with PCIe 3.0 and PCIe 4.0 slots, though the card will run at the lower PCIe 2.0 bandwidth. That bandwidth is not a bottleneck for a card with 91.87 GB/s of memory bandwidth and under 1 TFLOPS of compute. The memory clock is 957 MHz, with an effective data rate of 3.8 Gbps. The 102 W TDP means that power consumption is not a concern for most users; however, the 40 nm process node is less efficient than modern nodes, so the card will run warmer than a comparable modern low-end GPU. The dual-slot cooler is adequate for the 102 W TDP, but users should ensure unobstructed airflow around the card.
The display outputs are 2x DVI and 1x mini-HDMI 1.3a. This limits connectivity to older monitors or requires adapters for modern DisplayPort-only displays. The card does not support the latest display standards, so users with high-refresh-rate or 4K monitors will be constrained by the HDMI 1.3a and DVI outputs, which do not support the bandwidth needed for such displays. Power delivery is straightforward given the 300 W PSU recommendation, but the absence of a specified power connector means the card draws its power from the PCIe slot, which provides up to 75 W. Since the TDP is 102 W, this is a discrepancy that suggests the card may have a supplementary power connector that is simply not listed in the FACT PACK. Without that data, users should assume the card requires a 6-pin PCIe power cable, but that is an inference outside the provided facts.
FAQ
Q: What is the memory size and type of the GT 645 OEM?
A: The card has 1024 MB of GDDR5 memory on a 192-bit bus, providing 91.87 GB/s of bandwidth.
Q: What is the thermal design power (TDP) of this GPU?
A: The TDP is 102 W, and the suggested power supply rating is 300 W.
Q: What DirectX version does the card support?
A: It supports DirectX 12 (11_0), which means it can run DirectX 11 titles and has partial DirectX 12 support at the feature level 11_0.
Q: Is this card suitable for modern gaming?
A: The 50th percentile rank and 894.0 GFLOPS FP32 performance indicate it is a mid-pack card, suitable for older games or low-settings 1080p play, but not for modern AAA titles at high detail.
Q: What is the release date of the GT 645 OEM?
A: The release date is 2012-04-23, and the production status is end-of-life.
Q: Which architecture does this GPU use?
A: It uses the Fermi 2.0 architecture on a 40 nm process node, with 1,950 million transistors on a 332 mm² die.
Q: What display outputs are available?
A: The card has 2x DVI and 1x mini-HDMI 1.3a outputs.
Ray Tracing and Feature Set
The NVIDIA GeForce GT 645 OEM does not include any ray tracing cores or tensor cores, as those features were not part of the Fermi 2.0 architecture. The FACT PACK lists both rtCores and tensorCores as null, confirming that hardware-accelerated ray tracing and AI-based tensor operations are not supported. This is expected for a 2012-era card, as ray tracing acceleration only became a mainstream feature in much later GPU generations. Users who require ray tracing will need a different card, as this GPU has no dedicated hardware for that workload.
The card’s API support includes DirectX 12 (11_0) and OpenGL 4.6. DirectX 12 (11_0) means the card can run DirectX 12 applications but only at the 11_0 feature level, which lacks many of the advanced features of full DirectX 12 Ultimate. Vulkan support is not listed in the FACT PACK, so it is unknown whether the card can run Vulkan titles. OpenGL 4.6 support is solid for legacy applications and for some productivity software. The absence of tensor cores means no DLSS or other AI-based upscaling is available. The feature set is otherwise basic: no hardware video encoding or decoding is mentioned, and the display outputs (2x DVI, 1x mini-HDMI 1.3a) limit modern connectivity. The card’s pixel rate of 9.312 GPixel/s and texture rate of 37.25 GTexel/s define its rasterization throughput, which is adequate for the era but not for modern workloads. Overall, the GT 645 OEM is a straightforward rasterization card with no ray tracing, no AI acceleration, and a limited feature set that predates many of the technologies now standard in GPUs.
The AMD Equivalent of GeForce GT 645 OEM
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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