GeForce 930M vs Radeon HD 4870 X2

Intro

Compare that to the Radeon HD 4870 X2, which features clock speeds of 750 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR5 memory. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 4870 X2 should perform much faster than the GeForce 930M overall. (explain)

Radeon HD 4870 X2		230400 MB/sec
GeForce 930M		14400 MB/sec
	Difference: 216000 (1500%)

Texel Rate

The Radeon HD 4870 X2 will be a lot (about 169%) faster with regards to anisotropic filtering than the GeForce 930M. (explain)

Radeon HD 4870 X2		60000 Mtexels/sec
GeForce 930M		22272 Mtexels/sec
	Difference: 37728 (169%)

Pixel Rate

The Radeon HD 4870 X2 should be quite a bit (approximately 223%) better at anti-aliasing than the GeForce 930M, and able to handle higher resolutions while still performing well. (explain)

Radeon HD 4870 X2		24000 Mpixels/sec
GeForce 930M		7424 Mpixels/sec
	Difference: 16576 (223%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be moved past the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory speed. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 are processed per second. This is worked out by multiplying the total amount of texture units of the card 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 most pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the clock 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, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.