GeForce GT 640 DDR3 vs Radeon HD 3650 512MB

Intro

Compare those specs to the Radeon HD 3650 512MB, which has GPU core speed of 725 MHz, and 512 MB of GDDR3 RAM running at 800 MHz through a 128-bit bus. It also is made up of 120(24x5) Stream Processors, 8 Texture Address Units, and 4 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
Radeon HD 3650 512MB		78 Watts
	Difference: 13 Watts (20%)

Memory Bandwidth

The GeForce GT 640 DDR3 should in theory be much faster than the Radeon HD 3650 512MB overall. (explain)

GeForce GT 640 DDR3		57024 MB/sec
Radeon HD 3650 512MB		25600 MB/sec
	Difference: 31424 (123%)

Texel Rate

The GeForce GT 640 DDR3 should be a lot (approximately 397%) more effective at anisotropic filtering than the Radeon HD 3650 512MB. (explain)

GeForce GT 640 DDR3		28800 Mtexels/sec
Radeon HD 3650 512MB		5800 Mtexels/sec
	Difference: 23000 (397%)

Pixel Rate

The GeForce GT 640 DDR3 is quite a bit (about 397%) more effective at FSAA than the Radeon HD 3650 512MB, and also will be able to handle higher screen resolutions while still performing well. (explain)

GeForce GT 640 DDR3		14400 Mpixels/sec
Radeon HD 3650 512MB		2900 Mpixels/sec
	Difference: 11500 (397%)

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 largest amount of data (counted in megabytes per second) that can be transferred across the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.