GeForce GT 640 DDR3 vs Radeon HD 4550 512MB

Intro

Compare all that to the Radeon HD 4550 512MB, which uses a 55 nm design. AMD has set the core frequency at 600 MHz. The GDDR3 RAM works at a speed of 800 MHz on this card. It features 80(16x5) SPUs as well as 8 TAUs and 4 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4550 512MB		25 Watts
GeForce GT 640 DDR3		65 Watts
	Difference: 40 Watts (160%)

Memory Bandwidth

In theory, the GeForce GT 640 DDR3 will be 346% faster than the Radeon HD 4550 512MB in general, due to its greater data rate. (explain)

GeForce GT 640 DDR3		57024 MB/sec
Radeon HD 4550 512MB		12800 MB/sec
	Difference: 44224 (346%)

Texel Rate

The GeForce GT 640 DDR3 should be quite a bit (about 500%) more effective at texture filtering than the Radeon HD 4550 512MB. (explain)

GeForce GT 640 DDR3		28800 Mtexels/sec
Radeon HD 4550 512MB		4800 Mtexels/sec
	Difference: 24000 (500%)

Pixel Rate

The GeForce GT 640 DDR3 will be much (approximately 500%) faster with regards to anti-aliasing than the Radeon HD 4550 512MB, and able to handle higher resolutions better. (explain)

GeForce GT 640 DDR3		14400 Mpixels/sec
Radeon HD 4550 512MB		2400 Mpixels/sec
	Difference: 12000 (500%)

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: Bandwidth is the maximum amount of data (measured in MB per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster 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 per second. This is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.