Radeon HD 4890 2GB vs Radeon R5 M330

Intro

Compare those specifications to the Radeon R5 M330, which makes use of a 28 nm design. AMD has set the core frequency at 1030 MHz. The DDR3 RAM works at a speed of 900 MHz on this particular model. It features 320 SPUs along with 20 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon HD 4890 2GB should be quite a bit faster than the Radeon R5 M330 in general. (explain)

Radeon HD 4890 2GB		124800 MB/sec
Radeon R5 M330		14400 MB/sec
	Difference: 110400 (767%)

Texel Rate

The Radeon HD 4890 2GB is much (approximately 94%) more effective at anisotropic filtering than the Radeon R5 M330. (explain)

Radeon HD 4890 2GB		40000 Mtexels/sec
Radeon R5 M330		20600 Mtexels/sec
	Difference: 19400 (94%)

Pixel Rate

The Radeon HD 4890 2GB should be much (about 94%) better at AA than the Radeon R5 M330, and capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 4890 2GB		16000 Mpixels/sec
Radeon R5 M330		8240 Mpixels/sec
	Difference: 7760 (94%)

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 largest amount of information (measured in MB per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory speed. If the card has DDR memory, 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, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the video 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 maximum amount of pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka 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, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.