Radeon HD 4650 512MB vs Radeon R5 M230

Intro

Compare those specifications to the Radeon R5 M230, which features GPU core speed of 780 MHz, and 2048 MB of DDR3 RAM set to run at 1000 MHz through a 64-bit bus. It also is made up of 320 SPUs, 20 TAUs, and 4 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Both cards have the exact same memory bandwidth, so theoretically they should have the same performance. (explain)

Texel Rate

The Radeon HD 4650 512MB is a lot (more or less 23%) better at anisotropic filtering than the Radeon R5 M230. (explain)

Radeon HD 4650 512MB		19200 Mtexels/sec
Radeon R5 M230		15600 Mtexels/sec
	Difference: 3600 (23%)

Pixel Rate

The Radeon HD 4650 512MB should be much (more or less 54%) better at full screen anti-aliasing than the Radeon R5 M230, and will be able to handle higher screen resolutions better. (explain)

Radeon HD 4650 512MB		4800 Mpixels/sec
Radeon R5 M230		3120 Mpixels/sec
	Difference: 1680 (54%)

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 largest amount of data (counted in MB per second) that can be transported past the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory speed. If it uses DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

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