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Gaming Performance Comparison
In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GTX 645 (OEM) are very slightly better than the AMD Radeon HD 7750 1GB GDDR5.
The GTX 645 has a 23 MHz higher core clock speed and 16 more Texture Mapping Units than the HD 7750. This results in the GTX 645 providing 13.9 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 GTX 645 has a 23 MHz higher core clock speed than the HD 7750 and the same number of Render Output Units. This results in the GTX 645 providing 0.4 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 GTX 645 was released over a year more recently than the HD 7750, and so the GTX 645 is likely to have better driver support, meaning it will be more optimized for running the latest games.
The GeForce GTX 645 (OEM) and the Radeon HD 7750 1GB GDDR5 have the same amount of video memory, but are likely to provide slightly different experiences when displaying game textures at high resolutions.
The HD 7750 has 8 GB/sec greater memory bandwidth than the GTX 645, which means that the memory performance of the HD 7750 is marginally better than the GTX 645.
The GeForce GTX 645 (OEM) has 576 Shader Processing Units and the Radeon HD 7750 1GB GDDR5 has 512. However, the actual shader performance of the GTX 645 is 511 and the actual shader performance of the HD 7750 is 348. The GTX 645 having 163 better shader performance and an altogether better performance when taking into account other relevant data means that the GTX 645 delivers a marginally smoother and more efficient experience when processing graphical data than the HD 7750.
The GeForce GTX 645 (OEM) requires 65 Watts to run and the Radeon HD 7750 1GB GDDR5 requires 55 Watts. We would recommend a PSU with at least 450 Watts for the GTX 645 and a PSU with at least 400 Watts for the HD 7750. The GTX 645 requires 10 Watts more than the HD 7750 to run. The difference is not significant enough for the GTX 645 to have a noticeably larger impact on your yearly electricity bills than the HD 7750.
|Mini Review||Overview |
GeForce GTX 645 is an OEM only, Fast-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 Kepler GK106 which has 3 Stream Multiprocessors activated and thus offers 576 Shader Processing Units, 48 TMUs and 16 ROPs. The Central Unit is Initially Clocked at 823 and goes up to 888MHz, in Turbo Mode.
The GPU accesses a 1GB frame buffer of fast GDDR5, through a 128-bit memory interface. The size of the frame buffer is adequate. The Memory Clock Operates at 1000MHz.
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 450W 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 GeForce GTX 650.
We recommend a Modest Processor (Intel Core i3) and 8GB of RAM for a system with GeForce GTX 645.
|Radeon HD 7750 1GB GDDR5 is a fast-middle-class GPU based on the 28nm GCN (Graphics Core Next) architecture. |
It's based on Cape Verde Chip (Pro variant) and offers 512 Shader Processing Units, 32 TMUs and 16 ROPs on a 128-bit memory interface of fast GDDR5 (though some DDR3 variants were also released). The central unit is clocked at 800MHz while the memory clock operates at 1125MHz. Expect a power consumption of up to 55 Watt.
Benchmarks indicate today's modern games can be played at high settings using a 1080p resolution while most modern demanding games such as Metro 2033 will require reduced resolutions to be played optimally.
This GPU can be paired with an average Quad Core.