Radeon HD 3650 256MB vs Radeon HD 4670 512MB

Intro

Compare all that to the Radeon HD 4670 512MB, which has GPU core speed of 750 MHz, and 512 MB of GDDR4/GDDR3/DDR3/DDR2 RAM set to run at 1000 MHz through a 128-bit bus. It also features 320(64x5) Stream Processors, 32 Texture Address Units, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 512MB		70 Watts
Radeon HD 3650 256MB		78 Watts
	Difference: 8 Watts (11%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4670 512MB should in theory be quite a bit better than the Radeon HD 3650 256MB in general. (explain)

Radeon HD 4670 512MB		32000 MB/sec
Radeon HD 3650 256MB		25600 MB/sec
	Difference: 6400 (25%)

Texel Rate

The Radeon HD 4670 512MB should be quite a bit (approximately 314%) better at texture filtering than the Radeon HD 3650 256MB. (explain)

Radeon HD 4670 512MB		24000 Mtexels/sec
Radeon HD 3650 256MB		5800 Mtexels/sec
	Difference: 18200 (314%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 4670 512MB is superior to the Radeon HD 3650 256MB, by far. (explain)

Radeon HD 4670 512MB		6000 Mpixels/sec
Radeon HD 3650 256MB		2900 Mpixels/sec
	Difference: 3100 (107%)

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 largest amount of data (counted in megabytes per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number 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 better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.