GeForce 930M vs Radeon HD 5870

Intro

Compare those specs to the Radeon HD 5870, which features a core clock speed of 850 MHz and a GDDR5 memory frequency of 1200 MHz. It also makes use of a 256-bit bus, and makes use of a 40 nm design. It is comprised of 1600(320x5) SPUs, 80 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 5870 should in theory be quite a bit superior to the GeForce 930M overall. (explain)

Radeon HD 5870		153600 MB/sec
GeForce 930M		14400 MB/sec
	Difference: 139200 (967%)

Texel Rate

The Radeon HD 5870 will be quite a bit (approximately 205%) more effective at texture filtering than the GeForce 930M. (explain)

Radeon HD 5870		68000 Mtexels/sec
GeForce 930M		22272 Mtexels/sec
	Difference: 45728 (205%)

Pixel Rate

The Radeon HD 5870 will be a lot (about 266%) faster with regards to full screen anti-aliasing than the GeForce 930M, and also will be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 5870		27200 Mpixels/sec
GeForce 930M		7424 Mpixels/sec
	Difference: 19776 (266%)

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 largest amount of information (measured in megabytes per second) that can be transported across the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster 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 per second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.