Radeon HD 4650 512MB vs Radeon R9 380 4G

Intro

Compare that to the Radeon R9 380 4G, which comes with clock speeds of 970 MHz on the GPU, and 1425 MHz on the 4096 MB of GDDR5 RAM. It features 1792 SPUs as well as 112 TAUs and 32 ROPs.

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

The Radeon R9 380 4G should in theory perform a lot faster than the Radeon HD 4650 512MB in general. (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 (about 466%) faster with regards to anisotropic 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 a lot (about 547%) more effective at AA than the Radeon HD 4650 512MB, and also will be able to handle higher screen resolutions without losing too much performance. (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 max amount of data (counted in MB per second) that can be moved across the external memory interface within a second. It's calculated by multiplying the bus width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

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