Radeon HD 4650 512MB vs Radeon R9 380 2G

Intro

Compare all of that to the Radeon R9 380 2G, which comes with a clock frequency of 970 MHz and a GDDR5 memory speed of 1425 MHz. It also makes use of a 256-bit memory bus, and makes use of a 28 nm design. It features 1792 SPUs, 112 Texture Address Units, and 32 Raster Operation 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 2G		190 Watts
	Difference: 135 Watts (245%)

Memory Bandwidth

As far as performance goes, the Radeon R9 380 2G should in theory be much better than the Radeon HD 4650 512MB overall. (explain)

Radeon R9 380 2G		182400 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 166400 (1040%)

Texel Rate

The Radeon R9 380 2G is much (more or less 466%) better at AF than the Radeon HD 4650 512MB. (explain)

Radeon R9 380 2G		108640 Mtexels/sec
Radeon HD 4650 512MB		19200 Mtexels/sec
	Difference: 89440 (466%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon R9 380 2G is a better choice, by a large margin. (explain)

Radeon R9 380 2G		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: Memory bandwidth is the maximum amount of information (measured in megabytes per second) that can be moved past the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.