Radeon R7 250X 2GB vs Radeon R9 270

Intro

Compare those specifications to the Radeon R9 270, which comes with a core clock frequency of 900 MHz and a GDDR5 memory frequency of 1400 MHz. It also makes use of a 256-bit memory bus, and makes use of a 28 nm design. It features 1280 SPUs, 80 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250X 2GB		95 Watts
Radeon R9 270		150 Watts
	Difference: 55 Watts (58%)

Memory Bandwidth

In theory, the Radeon R9 270 should be much faster than the Radeon R7 250X 2GB in general. (explain)

Radeon R9 270		179200 MB/sec
Radeon R7 250X 2GB		72000 MB/sec
	Difference: 107200 (149%)

Texel Rate

The Radeon R9 270 is a lot (about 80%) better at anisotropic filtering than the Radeon R7 250X 2GB. (explain)

Radeon R9 270		72000 Mtexels/sec
Radeon R7 250X 2GB		40000 Mtexels/sec
	Difference: 32000 (80%)

Pixel Rate

The Radeon R9 270 should be quite a bit (more or less 80%) faster with regards to anti-aliasing than the Radeon R7 250X 2GB, and able to handle higher screen resolutions more effectively. (explain)

Radeon R9 270		28800 Mpixels/sec
Radeon R7 250X 2GB		16000 Mpixels/sec
	Difference: 12800 (80%)

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 max amount of information (counted in megabytes per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the interface width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

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