Radeon HD 4670 1GB vs Radeon R5 M255

Intro

Compare those specifications to the Radeon R5 M255, which comes with GPU clock speed of 940 MHz, and 2048 MB of DDR3 memory running at 1000 MHz through a 64-bit bus. It also is made up of 320 SPUs, 20 TAUs, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 4670 1GB should theoretically perform a lot faster than the Radeon R5 M255 overall. (explain)

Radeon HD 4670 1GB		35200 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 19200 (120%)

Texel Rate

The Radeon HD 4670 1GB is quite a bit (approximately 28%) better at texture filtering than the Radeon R5 M255. (explain)

Radeon HD 4670 1GB		24000 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 5200 (28%)

Pixel Rate

The Radeon R5 M255 should be quite a bit (more or less 25%) more effective at AA than the Radeon HD 4670 1GB, and will be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon R5 M255		7520 Mpixels/sec
Radeon HD 4670 1GB		6000 Mpixels/sec
	Difference: 1520 (25%)

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 megabytes per second) that can be moved across the external memory interface in one second. The number is calculated by multiplying the card's interface 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 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

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