Radeon HD 4670 512MB vs Radeon R7 250X

Intro

Compare all that to the Radeon R7 250X, which has a clock speed of 1000 MHz and a GDDR5 memory frequency of 1125 MHz. It also uses a 128-bit bus, and uses a 28 nm design. It is made up of 640 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Performance-wise, the Radeon R7 250X should theoretically be quite a bit superior to the Radeon HD 4670 512MB in general. (explain)

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

Texel Rate

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

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

Pixel Rate

The Radeon R7 250X is quite a bit (more or less 167%) better at FSAA than the Radeon HD 4670 512MB, and also able to handle higher screen resolutions without losing too much performance. (explain)

Radeon R7 250X		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: Bandwidth is the max amount of data (in units of MB per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the interface width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.