GeForce GT 640 DDR3 vs Radeon HD 3470 512MB

Intro

Compare those specs to the Radeon HD 3470 512MB, which has GPU core speed of 800 MHz, and 512 MB of GDDR3 memory running at 950 MHz through a 128-bit bus. It also is made up of 40(8x5) Stream Processors, 4 TAUs, and 4 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce GT 640 DDR3 should perform much faster than the Radeon HD 3470 512MB in general. (explain)

GeForce GT 640 DDR3		57024 MB/sec
Radeon HD 3470 512MB		30400 MB/sec
	Difference: 26624 (88%)

Texel Rate

The GeForce GT 640 DDR3 should be quite a bit (about 800%) better at anisotropic filtering than the Radeon HD 3470 512MB. (explain)

GeForce GT 640 DDR3		28800 Mtexels/sec
Radeon HD 3470 512MB		3200 Mtexels/sec
	Difference: 25600 (800%)

Pixel Rate

The GeForce GT 640 DDR3 will be quite a bit (approximately 350%) faster with regards to AA than the Radeon HD 3470 512MB, and also should be capable of handling higher screen resolutions without slowing down too much. (explain)

GeForce GT 640 DDR3		14400 Mpixels/sec
Radeon HD 3470 512MB		3200 Mpixels/sec
	Difference: 11200 (350%)

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 past the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

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