Radeon HD 4870 2GB vs Radeon R5 M230

Intro

Compare all of that to the Radeon R5 M230, which features a GPU core clock speed of 780 MHz, and 2048 MB of DDR3 memory running at 1000 MHz through a 64-bit bus. It also is comprised of 320 SPUs, 20 TAUs, and 4 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 4870 2GB should perform much faster than the Radeon R5 M230 overall. (explain)

Radeon HD 4870 2GB		115200 MB/sec
Radeon R5 M230		16000 MB/sec
	Difference: 99200 (620%)

Texel Rate

The Radeon HD 4870 2GB will be quite a bit (about 92%) more effective at anisotropic filtering than the Radeon R5 M230. (explain)

Radeon HD 4870 2GB		30000 Mtexels/sec
Radeon R5 M230		15600 Mtexels/sec
	Difference: 14400 (92%)

Pixel Rate

The Radeon HD 4870 2GB is quite a bit (approximately 285%) faster with regards to AA than the Radeon R5 M230, and able to handle higher screen resolutions more effectively. (explain)

Radeon HD 4870 2GB		12000 Mpixels/sec
Radeon R5 M230		3120 Mpixels/sec
	Difference: 8880 (285%)

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 data (in units of MB per second) that can be transferred past the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher 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 number of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total texture units by the core speed of the chip. The higher 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 maximum number of pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.