Radeon HD 3650 vs Radeon HD 4670 512MB

Intro

Compare all that to the Radeon HD 4670 512MB, which uses a 55 nm design. AMD has clocked the core frequency at 750 MHz. The GDDR4/GDDR3/DDR3/DDR2 memory works at a speed of 1000 MHz on this particular model. It features 320(64x5) SPUs as well as 32 Texture Address Units and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

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

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

Texel Rate

The Radeon HD 4670 512MB will be a lot (more or less 314%) better at anisotropic filtering than the Radeon HD 3650. (explain)

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

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 4670 512MB is the winner, by a large margin. (explain)

Radeon HD 4670 512MB		6000 Mpixels/sec
Radeon HD 3650		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 maximum amount of information (measured in megabytes per second) that can be moved across the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, 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 are processed in one second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.