Radeon HD 4670 1GB vs Radeon R7 250

Intro

Compare all of that to the Radeon R7 250, which comes with core speeds of 1000 MHz on the GPU, and 1150 MHz on the 1024 MB of GDDR5 memory. It features 384 SPUs as well as 24 Texture Address Units and 8 ROPs.

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

Theoretically speaking, the Radeon R7 250 should perform quite a bit faster than the Radeon HD 4670 1GB in general. (explain)

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

Texel Rate

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

Pixel Rate

If running with a high 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 largest amount of data (in units of megabytes per second) that can be transferred across the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory speed. If it uses DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. The number 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 is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.