Radeon HD 4650 512MB vs Radeon R9 380 4G

Intro

Compare all that to the Radeon R9 380 4G, which features clock speeds of 970 MHz on the GPU, and 1425 MHz on the 4096 MB of GDDR5 memory. It features 1792 SPUs along with 112 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 512MB		55 Watts
Radeon R9 380 4G		190 Watts
	Difference: 135 Watts (245%)

Memory Bandwidth

In theory, the Radeon R9 380 4G is 1040% faster than the Radeon HD 4650 512MB in general, due to its higher data rate. (explain)

Radeon R9 380 4G		182400 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 166400 (1040%)

Texel Rate

The Radeon R9 380 4G should be much (more or less 466%) more effective at texture filtering than the Radeon HD 4650 512MB. (explain)

Radeon R9 380 4G		108640 Mtexels/sec
Radeon HD 4650 512MB		19200 Mtexels/sec
	Difference: 89440 (466%)

Pixel Rate

The Radeon R9 380 4G is quite a bit (more or less 547%) faster with regards to anti-aliasing than the Radeon HD 4650 512MB, and also should be able to handle higher screen resolutions more effectively. (explain)

Radeon R9 380 4G		31040 Mpixels/sec
Radeon HD 4650 512MB		4800 Mpixels/sec
	Difference: 26240 (547%)

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 data (in units of megabytes per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster 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 worked out by multiplying the total amount of texture units by the core 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 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. Pixel rate is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.