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Gaming Performance Comparison
In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GT 640 are significantly better than the Intel HD Graphics 4600 Desktop.
The GeForce GT 640 has a 502 MHz higher core clock speed and 28 more Texture Mapping Units than the Graphics 4600. This results in the GeForce GT 640 providing 27.3 GTexel/s better texturing performance. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.
The GeForce GT 640 has a 502 MHz higher core clock speed and 14 more Render Output Units than the Graphics 4600. This results in the GeForce GT 640 providing 13.6 GPixel/s better pixeling performance. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.
The Graphics 4600 was released less than a year after the GeForce GT 640, and so they are likely to have similar driver support for optimizing performance when running the latest games.
The GeForce GT 640 has 2048 MB video memory, but the Graphics 4600 does not have an entry, so the two GPUs cannot be reliably compared in this area.
The HD Graphics 4600 Desktop has 80 Shader Processing Units and the GeForce GT 640 has 384. However, the actual shader performance of the Graphics 4600 is 157 and the actual shader performance of the GeForce GT 640 is 346. The GeForce GT 640 having 189 better shader performance and an altogether better performance when taking into account other relevant data means that the GeForce GT 640 delivers a noticeably smoother and more efficient experience when processing graphical data than the Graphics 4600.
The Graphics 4600 transistor size technology is 6 nm (nanometers) smaller than the GeForce GT 640. This means that the Graphics 4600 is expected to run very slightly cooler and achieve higher clock frequencies than the GeForce GT 640.
The GeForce GT 640 requires 65 Watts to run but there is no entry for the Graphics 4600. We would recommend a PSU with at least 350 Watts for the GeForce GT 640, but we do not have a recommended PSU wattage for the Graphics 4600.
|Mini Review||Intel HD Graphics 4600 Desktop is the successor to Intel HD 4000 Desktop that's featured in the Haswell based desktop CPUs. |
It features 20 Execution Units (80 Shader Processing Units) and its central-unit speed will range between 400MHz and 1250MHz (Turbo Boost) and that the fastest memory supported is DDR3-1600 meaning its memory-clock will operate at 800MHz, at the most.
Benchmarks indicate its performance is up to 25% better than previous Intel HD 4000. However, only Iris Graphics offer performance good enough to play all modern demanding games, some even with extremely fluent frame rates.
GeForce GT 640 is a Middle-Class Graphics Card based on the first revision of the Kepler Architecture.
The Kepler Architecture was NVIDIA's big step to power efficiency. Each Stream Multiprocessor (SMX) now hosts 192 Shader Processing Units - against the 48 of older Fermi Architecture, and has been redesigned being now clocked at the same speed of the Central Unit. This means they are more energy efficient and will consequently lead to cooler operating temperatures. However, it also means they are weaker. It can be said that one Fermi SMX is as fast as 2 Kepler SMXs.
Additionally, and not available in all GPUs, Kepler also introduced the Boost Clock Feature. The Boost Clock is an even higher Clock Speed activated when in gaming mode and becomes the effective speed of the GPU.
It equips a GPU Codenamed GK107-300-A2 which has 2 Stream Multiprocessor activated and thus offers 384 Shader Processing Units, 32 TMUs and 16 ROPs. The Central Unit is clocked at 902MHz.
The GPU accesses a 2GB frame buffer of DDR3, through a 128-bit memory interface. The size of the frame buffer is exaggerated and in no way benefits the GPU. The Memory Clock Operates at 891MHz.
DirectX 11.0 Support (11.0 Hardware Default) and support for Optimus, CUDA, OpenCL, DirectCompute, 3D Vision Surround, PhysX, Realtime Raytracing and other technologies
With a rated board TDP of 65W, it requires at least a 350W PSU and it relies entirely on the PCI Slot for power, meaning no extra connectors are required.
Gaming benchmarks put its performance on average with Radeon HD 6670.
We recommend a Modest Processor (Intel Core i3) and 8GB of RAM for a system with GeForce GT 640.