Radeon HD 4830 512MB vs Radeon R7 M265

Intro

Compare those specifications to the Radeon R7 M265, which features a clock frequency of 725 MHz and a DDR3 memory speed of 1000 MHz. It also uses a 128-bit bus, and makes use of a 28 nm design. It is made up of 384 SPUs, 24 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 4830 512MB should be 80% faster than the Radeon R7 M265 overall, because of its higher data rate. (explain)

Radeon HD 4830 512MB		57600 MB/sec
Radeon R7 M265		32000 MB/sec
	Difference: 25600 (80%)

Texel Rate

The Radeon HD 4830 512MB will be a little bit (more or less 6%) faster with regards to texture filtering than the Radeon R7 M265. (explain)

Radeon HD 4830 512MB		18400 Mtexels/sec
Radeon R7 M265		17400 Mtexels/sec
	Difference: 1000 (6%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 4830 512MB is superior to the Radeon R7 M265, by a large margin. (explain)

Radeon HD 4830 512MB		9200 Mpixels/sec
Radeon R7 M265		5800 Mpixels/sec
	Difference: 3400 (59%)

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 max amount of information (measured in megabytes per second) that can be moved past the external memory interface within a second. The number is calculated by multiplying the interface width by its memory speed. If the card has DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the 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 amount of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka 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 of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.