Radeon HD 4850 1GB vs Radeon R7 250

Intro

Compare all of that to the Radeon R7 250, which has core speeds of 1000 MHz on the GPU, and 1150 MHz on the 1024 MB of GDDR5 RAM. It features 384 SPUs along with 24 TAUs 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 1GB		110 Watts
	Difference: 45 Watts (69%)

Memory Bandwidth

Theoretically speaking, the Radeon R7 250 should be a little bit faster than the Radeon HD 4850 1GB overall. (explain)

Radeon R7 250		73600 MB/sec
Radeon HD 4850 1GB		63552 MB/sec
	Difference: 10048 (16%)

Texel Rate

The Radeon HD 4850 1GB will be a little bit (about 4%) faster with regards to texture filtering than the Radeon R7 250. (explain)

Radeon HD 4850 1GB		25000 Mtexels/sec
Radeon R7 250		24000 Mtexels/sec
	Difference: 1000 (4%)

Pixel Rate

The Radeon HD 4850 1GB will be much (more or less 25%) better at anti-aliasing than the Radeon R7 250, and should be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 4850 1GB		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 (counted in MB per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster 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 number of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.