Radeon HD 4850 X2 1GB vs Radeon R7 250

Intro

Compare that to the Radeon R7 250, which has a clock frequency of 1000 MHz and a GDDR5 memory speed of 1150 MHz. It also features a 128-bit memory bus, and makes use of a 28 nm design. It is made up of 384 SPUs, 24 Texture Address Units, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250		65 Watts
Radeon HD 4850 X2 1GB		250 Watts
	Difference: 185 Watts (285%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4850 X2 1GB should be a lot faster than the Radeon R7 250 in general. (explain)

Radeon HD 4850 X2 1GB		127104 MB/sec
Radeon R7 250		73600 MB/sec
	Difference: 53504 (73%)

Texel Rate

The Radeon HD 4850 X2 1GB is much (approximately 108%) better at AF than the Radeon R7 250. (explain)

Radeon HD 4850 X2 1GB		50000 Mtexels/sec
Radeon R7 250		24000 Mtexels/sec
	Difference: 26000 (108%)

Pixel Rate

The Radeon HD 4850 X2 1GB should be quite a bit (about 150%) better at full screen anti-aliasing than the Radeon R7 250, and also capable of handling higher resolutions more effectively. (explain)

Radeon HD 4850 X2 1GB		20000 Mpixels/sec
Radeon R7 250		8000 Mpixels/sec
	Difference: 12000 (150%)

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 data (in units of MB per second) that can be transported past the external memory interface in one second. It's worked out by multiplying the bus width by its memory clock speed. In the case of DDR type memory, it must 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 anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the video card will be at handling 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 video card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.