Radeon R7 250 vs Radeon RX 470 4GB

Intro

Compare those specs to the Radeon RX 470 4GB, which makes use of a 14 nm design. AMD has set the core frequency at 926 MHz. The GDDR5 memory runs at a frequency of 1650 MHz on this specific card. It features 2048 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250		65 Watts
Radeon RX 470 4GB		120 Watts
	Difference: 55 Watts (85%)

Memory Bandwidth

Performance-wise, the Radeon RX 470 4GB should in theory be quite a bit better than the Radeon R7 250 overall. (explain)

Radeon RX 470 4GB		211200 MB/sec
Radeon R7 250		73600 MB/sec
	Difference: 137600 (187%)

Texel Rate

The Radeon RX 470 4GB should be quite a bit (approximately 394%) better at anisotropic filtering than the Radeon R7 250. (explain)

Radeon RX 470 4GB		118528 Mtexels/sec
Radeon R7 250		24000 Mtexels/sec
	Difference: 94528 (394%)

Pixel Rate

The Radeon RX 470 4GB should be quite a bit (more or less 270%) more effective at FSAA than the Radeon R7 250, and able to handle higher resolutions more effectively. (explain)

Radeon RX 470 4GB		29632 Mpixels/sec
Radeon R7 250		8000 Mpixels/sec
	Difference: 21632 (270%)

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: Memory bandwidth is the max amount of information (in units of MB per second) that can be transported over the external memory interface in a second. It's calculated by multiplying the bus width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 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, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the video 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 worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called 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 potential to get to the maximum fill rate.