Radeon HD 4890 1GB vs Radeon R7 250

Intro

Compare all that to the Radeon R7 250, which features 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 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250		65 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 125 Watts (192%)

Memory Bandwidth

In theory, the Radeon HD 4890 1GB will be 70% quicker than the Radeon R7 250 overall, due to its greater data rate. (explain)

Radeon HD 4890 1GB		124800 MB/sec
Radeon R7 250		73600 MB/sec
	Difference: 51200 (70%)

Texel Rate

The Radeon HD 4890 1GB will be quite a bit (about 67%) more effective at AF than the Radeon R7 250. (explain)

Radeon HD 4890 1GB		40000 Mtexels/sec
Radeon R7 250		24000 Mtexels/sec
	Difference: 16000 (67%)

Pixel Rate

The Radeon HD 4890 1GB will be much (more or less 100%) more effective at AA than the Radeon R7 250, and also will be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 4890 1GB		16000 Mpixels/sec
Radeon R7 250		8000 Mpixels/sec
	Difference: 8000 (100%)

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 maximum amount of data (in units of megabytes per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied 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 higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card could 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 Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.