Radeon HD 4870 X2 vs Radeon R7 240

Intro

Compare all of that to the Radeon R7 240, which comes with GPU core speed of 730 MHz, and 2048 MB of DDR3 memory running at 900 MHz through a 128-bit bus. It also is comprised of 320 Stream Processors, 20 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 240		30 Watts
Radeon HD 4870 X2		350 Watts
	Difference: 320 Watts (1067%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4870 X2 is 700% quicker than the Radeon R7 240 overall, because of its higher data rate. (explain)

Radeon HD 4870 X2		230400 MB/sec
Radeon R7 240		28800 MB/sec
	Difference: 201600 (700%)

Texel Rate

The Radeon HD 4870 X2 will be a lot (approximately 311%) better at anisotropic filtering than the Radeon R7 240. (explain)

Radeon HD 4870 X2		60000 Mtexels/sec
Radeon R7 240		14600 Mtexels/sec
	Difference: 45400 (311%)

Pixel Rate

The Radeon HD 4870 X2 is much (approximately 311%) more effective at full screen anti-aliasing than the Radeon R7 240, and capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 4870 X2		24000 Mpixels/sec
Radeon R7 240		5840 Mpixels/sec
	Difference: 18160 (311%)

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: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be transported over the external memory interface in a second. The number is calculated by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The higher this number, 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 most pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant 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.