Radeon HD 4870 2GB vs Radeon R5 M330

Intro

Compare those specifications to the Radeon R5 M330, which uses a 28 nm design. AMD has set the core speed at 1030 MHz. The DDR3 memory works at a frequency of 900 MHz on this particular card. It features 320 SPUs as well as 20 Texture Address Units and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 4870 2GB should be 700% faster than the Radeon R5 M330 overall, because of its higher bandwidth. (explain)

Radeon HD 4870 2GB		115200 MB/sec
Radeon R5 M330		14400 MB/sec
	Difference: 100800 (700%)

Texel Rate

The Radeon HD 4870 2GB should be much (about 46%) more effective at anisotropic filtering than the Radeon R5 M330. (explain)

Radeon HD 4870 2GB		30000 Mtexels/sec
Radeon R5 M330		20600 Mtexels/sec
	Difference: 9400 (46%)

Pixel Rate

The Radeon HD 4870 2GB is quite a bit (approximately 46%) more effective at full screen anti-aliasing than the Radeon R5 M330, and capable of handling higher screen resolutions better. (explain)

Radeon HD 4870 2GB		12000 Mpixels/sec
Radeon R5 M330		8240 Mpixels/sec
	Difference: 3760 (46%)

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 max amount of data (measured in MB per second) that can be transported over the external memory interface within a second. It is worked out by multiplying the bus width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock 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 processed in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.