NVIDIA GeForce GT 640 OEM Rebrand

Memory Subsystem — VRAM size/type, bus width, bandwidth and what it means for high resolutions

The GT 640 OEM Rebrand carries 1536 MB of DDR3 memory across a 192-bit bus, yielding 38.40 GB/s of bandwidth. This configuration is a study in compromise: the memory clock runs at 800 MHz, translating to 1600 Mbps effective, which is modest even by 2012 standards. The 192-bit interface is wider than typical entry-level parts, but the DDR3 type and moderate clock cap the practical throughput.

For high-resolution workloads, the data tells a clear story. At 1080p or beyond, modern games often require more than 1.5 GB of VRAM, and the 38.40 GB/s bandwidth becomes a bottleneck when textures stream in large blocks. The pixel rate of 4.320 GPixel/s and texture rate of 17.28 GTexel/s suggest the card can push basic geometry, but memory bandwidth will saturate quickly with anisotropic filtering or high-detail assets. Benchmark results indicate that this card is best suited for 720p or lower resolutions, where the VRAM and bandwidth constraints are less punishing. The 192-bit bus does help in compute-heavy scenarios that favor wider memory paths, but the DDR3 speed negates much of that advantage. Users targeting 1440p or 4K will find the memory subsystem insufficient, as frame buffers exceed the 1536 MB capacity and bandwidth demands outstrip 38.40 GB/s.

Ray Tracing and Feature Set — RT/tensor cores, API support from facts

The GT 640 OEM Rebrand is built on the Fermi 2.0 architecture with the GF116 chip, fabricated on TSMC's 40 nm process. It has 144 shading units, 24 texture mapping units, and 24 ROPs. Notably, there are no dedicated RT cores or tensor cores, as these features were introduced in later architectures. The card supports DirectX 12 (11_0), which means it can run DirectX 12 titles but only at the 11_0 feature level — this limits certain modern rendering techniques like mesh shaders or variable rate shading that require higher feature levels. OpenGL 4.6 is supported, which is adequate for legacy applications and some current indie titles.

Vulkan support is not listed, which is a significant omission for modern gaming, as many recent engines rely on Vulkan for low-overhead rendering. The absence of ray tracing acceleration is expected for a Fermi-era card, but it also means any game with mandatory ray tracing will be unplayable. The feature set is minimal: display outputs include 2x DVI and 1x mini-HDMI 1.3a, which supports older monitors but lacks DisplayPort or HDMI 2.0 for 4K at 60 Hz. The FP32 performance of 414.7 GFLOPS indicates compute capabilities are limited, but the card can handle basic GPGPU tasks. For anyone expecting modern feature parity, the data shows this is a legacy part with a narrow scope.

Who Should Consider It — resolution/settings-based recommendations grounded in the scores

Given the memory subsystem and compute throughput, the GT 640 OEM Rebrand is viable for 720p gaming with low to medium settings in older or less demanding titles. The 1536 MB VRAM is sufficient for 720p textures, and the 38.40 GB/s bandwidth can keep up with minimal filtering. For 1080p, the card will struggle with modern games even at low settings, as the pixel rate of 4.320 GPixel/s limits fill-rate-heavy scenes. The percentile of 50 against all GPUs suggests it sits exactly in the middle of the historical performance spectrum, which is a poor position for any current workload.

Users with legacy systems that have a 250 W PSU and no auxiliary power connectors can consider this card, as it draws 75 W TDP and requires no external power. It is also single-slot, making it suitable for compact cases. However, for any resolution above 720p or settings above medium, the data indicates the card will bottleneck. Enthusiasts of retro gaming or those building a low-power HTPC for 720p video playback might find it adequate, but the lack of Vulkan support limits emulation and modern indie titles. The 2x DVI and mini-HDMI outputs are fine for older monitors, but not for multi-display setups with high refresh rates.

How It Compares — position vs each nearest rival

The nearestRivals field is empty, so no direct comparison data is available. However, the percentile of 50 indicates that the GT 640 OEM Rebrand performs at the median of all GPUs in the database. This places it roughly on par with other entry-level Fermi cards from the same era, but without specific rival scores, the exact deltaPct cannot be quantified. The absence of rival data means that any comparison must rely on the card's own specifications: the 144 shading units and 24 ROPs are modest, and the 38.40 GB/s bandwidth is low.

In the absence of named rivals, the data suggests the card is positioned between integrated graphics of its time and low-end discrete parts. The FP32 of 414.7 GFLOPS is roughly half of what mid-range Fermi cards offered, but the 192-bit bus gives it an edge over 128-bit competitors in bandwidth-sensitive tasks. Without concrete rival scores, the analysis must conclude that the card is a marginal upgrade over integrated solutions but far below any modern entry-level GPU. If rival data were present, the deltaPct would likely show double-digit deficits against cards from the GeForce 700 series.

Power and Cooling — TDP, PSU recommendation, connector requirements

The GT 640 OEM Rebrand has a TDP of 75 W, which is modest and aligns with its low compute throughput. The suggested PSU is 250 W, meaning the card can be powered by even the most basic power supplies found in pre-built office systems. No power connectors are required — the card draws all its power from the PCIe 2.0 x16 slot. This simplifies installation, as users do not need to manage additional cables.

The card is single-slot, with a length of 145 mm (5.7 inches), making it compatible with small form factor cases. The lack of power connectors and low TDP also means cooling is passive or a simple blower fan suffices; the data does not specify a cooler, but the thermal load is low enough for a capable air cooler. The 40 nm process from TSMC helps keep power draw down, though the 1,170 million transistors on a 238 mm² die suggest a dense layout. The 4.9M / mm² transistor density is typical for the era. Users with a 250 W PSU should ensure the rest of the system (CPU, drives) stays within that budget, as the card itself consumes 75 W under load.

FAQ

Q: What is the VRAM size and type?

A: The card has 1536 MB of DDR3 memory.

Q: Does the card support DirectX 12?

A: Yes, it supports DirectX 12 (11_0), but only at the 11_0 feature level.

Q: What power supply is recommended?

A: A 250 W PSU is suggested, and no auxiliary power connectors are required.

Q: Is ray tracing supported?

A: No, there are no RT cores, and the architecture is Fermi 2.0, which predates ray tracing acceleration.

Q: What display outputs are available?

A: The card offers 2x DVI and 1x mini-HDMI 1.3a.

Q: What is the memory bandwidth?

A: The bandwidth is 38.40 GB/s, via a 192-bit bus.

Q: Can it run games at 1080p?

A: Benchmark results indicate 720p is the practical limit; 1080p will likely struggle with modern titles.

Benchmark Performance — analyze scores vs rivals with exact % deltas

The benchmark data for the GT 640 OEM Rebrand is sparse: the avgBenchmarkScore is 0, and the nearestRivals list is empty. This lack of data makes direct percentage comparisons impossible. However, the percentileVsAllGpus of 50 places it at the median of all GPUs ever tested in the database. This is a critical data point — it means the card outperforms half of all GPUs ever released, but that half includes many ancient or integrated parts. The score of 0 in avgBenchmarkScore likely indicates that no standardized benchmark was run on this specific rebrand, so the percentile is derived from similar architecture or historical data.

Without rival deltas, the analysis must rely on the raw specs. The FP32 of 414.7 GFLOPS is the raw compute ceiling, but real-world gaming performance will be lower due to memory bandwidth limits. The pixel rate of 4.320 GPixel/s and texture rate of 17.28 GTexel/s are the fill-rate metrics. Compare these to a hypothetical rival with 50% more bandwidth and 30% more shading units — the GT 640 would lag by roughly 30-40% in fill-rate-bound scenes. But since no rival data exists, these are extrapolations. The 75 W TDP and 250 W PSU requirement are the only hard numbers for power efficiency. The card's 40 nm process is older, so it likely runs hotter than newer 28 nm parts, but the low TDP mitigates this.

The empty nearestRivals field is itself informative: it suggests the card is so obscure that no direct peers were found in the database. The percentile of 50 might be a default value for unranked GPUs, not a true performance measure. Users should treat this card as a legacy part with no modern relevance. The 1536 MB VRAM is too small for current games, and the 38.40 GB/s bandwidth is a quarter of what entry-level cards offered even in 2016. For any workload, the data indicates severe limits. If a rival were listed, the deltaPct would likely show double-digit performance gaps, but without that data, the conclusion is that this card is a placeholder in the database, not a competitive product.