Radeon HD 4670 512MB vs Radeon R7 250X 2GB

Intro

Compare those specs to the Radeon R7 250X 2GB, which comes with core clock speeds of 1000 MHz on the GPU, and 1125 MHz on the 2048 MB of GDDR5 RAM. It features 640 SPUs as well as 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 512MB		70 Watts
Radeon R7 250X 2GB		95 Watts
	Difference: 25 Watts (36%)

Memory Bandwidth

Theoretically speaking, the Radeon R7 250X 2GB should be 125% faster than the Radeon HD 4670 512MB overall, due to its greater data rate. (explain)

Radeon R7 250X 2GB		72000 MB/sec
Radeon HD 4670 512MB		32000 MB/sec
	Difference: 40000 (125%)

Texel Rate

The Radeon R7 250X 2GB is much (more or less 67%) faster with regards to texture filtering than the Radeon HD 4670 512MB. (explain)

Radeon R7 250X 2GB		40000 Mtexels/sec
Radeon HD 4670 512MB		24000 Mtexels/sec
	Difference: 16000 (67%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon R7 250X 2GB is a better choice, by a large margin. (explain)

Radeon R7 250X 2GB		16000 Mpixels/sec
Radeon HD 4670 512MB		6000 Mpixels/sec
	Difference: 10000 (167%)

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 largest amount of information (measured in MB per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the interface width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total number of texture units of the card 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.