GeForce 930M vs Radeon HD 4870 2GB

Intro

Compare those specs to the Radeon HD 4870 2GB, which features a GPU core clock speed of 750 MHz, and 2048 MB of GDDR5 RAM running at 900 MHz through a 256-bit bus. It also is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 4870 2GB should theoretically be much faster than the GeForce 930M in general. (explain)

Radeon HD 4870 2GB		115200 MB/sec
GeForce 930M		14400 MB/sec
	Difference: 100800 (700%)

Texel Rate

The Radeon HD 4870 2GB should be much (about 35%) better at texture filtering than the GeForce 930M. (explain)

Radeon HD 4870 2GB		30000 Mtexels/sec
GeForce 930M		22272 Mtexels/sec
	Difference: 7728 (35%)

Pixel Rate

The Radeon HD 4870 2GB will be much (approximately 62%) faster with regards to FSAA than the GeForce 930M, and also should be able to handle higher resolutions more effectively. (explain)

Radeon HD 4870 2GB		12000 Mpixels/sec
GeForce 930M		7424 Mpixels/sec
	Difference: 4576 (62%)

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 information (measured in megabytes per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.