Radeon HD 3870 512MB vs Radeon R5 M330

Intro

Compare all of that to the Radeon R5 M330, which has GPU core speed of 1030 MHz, and 2048 MB of DDR3 memory running at 900 MHz through a 64-bit bus. It also is comprised of 320 SPUs, 20 TAUs, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 3870 512MB should in theory perform a lot faster than the Radeon R5 M330 overall. (explain)

Radeon HD 3870 512MB		57600 MB/sec
Radeon R5 M330		14400 MB/sec
	Difference: 43200 (300%)

Texel Rate

The Radeon R5 M330 is quite a bit (more or less 66%) more effective at anisotropic filtering than the Radeon HD 3870 512MB. (explain)

Radeon R5 M330		20600 Mtexels/sec
Radeon HD 3870 512MB		12400 Mtexels/sec
	Difference: 8200 (66%)

Pixel Rate

The Radeon HD 3870 512MB will be much (approximately 50%) better at anti-aliasing than the Radeon R5 M330, and will be capable of handling higher screen resolutions better. (explain)

Radeon HD 3870 512MB		12400 Mpixels/sec
Radeon R5 M330		8240 Mpixels/sec
	Difference: 4160 (50%)

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 transported over the external memory interface in a second. The number is worked out by multiplying the bus width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 number of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the video 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 the video card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units 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 rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.