Radeon HD 3650 256MB vs Radeon HD 4670 512MB

Intro

Compare those specifications to the Radeon HD 4670 512MB, which has GPU clock 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 is comprised of 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

The Radeon HD 4670 512MB should in theory perform quite a bit faster 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 will be quite a bit (more or less 314%) faster with regards to AF 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

The Radeon HD 4670 512MB is a lot (more or less 107%) faster with regards to AA than the Radeon HD 3650 256MB, and also should be capable of handling higher resolutions without slowing down too much. (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: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be transported over the external memory interface in a second. It's calculated by multiplying the interface width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the clock 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 rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.