Radeon HD 4670 1GB vs Radeon R7 250

Intro

Compare those specifications to the Radeon R7 250, which comes with a GPU core clock speed of 1000 MHz, and 1024 MB of GDDR5 memory set to run at 1150 MHz through a 128-bit bus. It also is comprised of 384 Stream Processors, 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 4670 1GB		70 Watts
	Difference: 5 Watts (8%)

Memory Bandwidth

In theory, the Radeon R7 250 will be 109% quicker than the Radeon HD 4670 1GB overall, because of its higher bandwidth. (explain)

Radeon R7 250		73600 MB/sec
Radeon HD 4670 1GB		35200 MB/sec
	Difference: 38400 (109%)

Texel Rate

Both cards have the exact same texel fill rate, so in theory they should be equally good at at AF. (explain)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R7 250 is a better choice, and very much so. (explain)

Radeon R7 250		8000 Mpixels/sec
Radeon HD 4670 1GB		6000 Mpixels/sec
	Difference: 2000 (33%)

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 maximum amount of information (in units of megabytes per second) that can be transported over the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 can be processed per second. This number is calculated by multiplying the total number of texture units of the card 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 processed per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. 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 get to the maximum fill rate.