GeForce GT 640 DDR3 vs Radeon HD 5750 1GB

Intro

Compare all that to the Radeon HD 5750 1GB, which uses a 40 nm design. AMD has set the core frequency at 700 MHz. The GDDR5 memory runs at a frequency of 1150 MHz on this specific model. It features 720(144x5) SPUs along with 36 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Radeon HD 5750 1GB		86 Watts
	Difference: 21 Watts (32%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5750 1GB will be 29% faster than the GeForce GT 640 DDR3 overall, because of its greater data rate. (explain)

Radeon HD 5750 1GB		73600 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 16576 (29%)

Texel Rate

The GeForce GT 640 DDR3 should be a bit (more or less 14%) faster with regards to anisotropic filtering than the Radeon HD 5750 1GB. (explain)

GeForce GT 640 DDR3		28800 Mtexels/sec
Radeon HD 5750 1GB		25200 Mtexels/sec
	Difference: 3600 (14%)

Pixel Rate

The GeForce GT 640 DDR3 should be a lot (approximately 29%) better at anti-aliasing than the Radeon HD 5750 1GB, and also capable of handling higher screen resolutions without slowing down too much. (explain)

GeForce GT 640 DDR3		14400 Mpixels/sec
Radeon HD 5750 1GB		11200 Mpixels/sec
	Difference: 3200 (29%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of megabytes per second) that can be transferred over the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.