Radeon HD 4850 2GB vs Radeon R7 250

Intro

Compare that to the Radeon R7 250, which has core clock speeds of 1000 MHz on the GPU, and 1150 MHz on the 1024 MB of GDDR5 memory. It features 384 SPUs along with 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 4850 2GB		110 Watts
	Difference: 45 Watts (69%)

Memory Bandwidth

In theory, the Radeon R7 250 will be 16% quicker than the Radeon HD 4850 2GB overall, due to its greater bandwidth. (explain)

Radeon R7 250		73600 MB/sec
Radeon HD 4850 2GB		63552 MB/sec
	Difference: 10048 (16%)

Texel Rate

The Radeon HD 4850 2GB is a little bit (approximately 4%) more effective at AF than the Radeon R7 250. (explain)

Radeon HD 4850 2GB		25000 Mtexels/sec
Radeon R7 250		24000 Mtexels/sec
	Difference: 1000 (4%)

Pixel Rate

The Radeon HD 4850 2GB is a lot (about 25%) more effective at FSAA than the Radeon R7 250, and also should be capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 4850 2GB		10000 Mpixels/sec
Radeon R7 250		8000 Mpixels/sec
	Difference: 2000 (25%)

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 largest amount of information (in units of megabytes per second) that can be transported across the external memory interface in one second. It is worked out by multiplying the interface width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen 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 by the core speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its 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 card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called 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 memory bandwidth is, the lower the potential to reach the max fill rate.