Radeon HD 4850 512MB vs Radeon R7 250

Intro

Compare those specs to the Radeon R7 250, which features a core clock speed of 1000 MHz and a GDDR5 memory frequency of 1150 MHz. It also uses a 128-bit memory bus, and uses a 28 nm design. It is made up of 384 SPUs, 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 512MB		110 Watts
	Difference: 45 Watts (69%)

Memory Bandwidth

The Radeon R7 250, in theory, should perform just a bit faster than the Radeon HD 4850 512MB in general. (explain)

Radeon R7 250		73600 MB/sec
Radeon HD 4850 512MB		63552 MB/sec
	Difference: 10048 (16%)

Texel Rate

The Radeon HD 4850 512MB should be a small bit (more or less 4%) better at anisotropic filtering than the Radeon R7 250. (explain)

Radeon HD 4850 512MB		25000 Mtexels/sec
Radeon R7 250		24000 Mtexels/sec
	Difference: 1000 (4%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 4850 512MB is superior to the Radeon R7 250, by a large margin. (explain)

Radeon HD 4850 512MB		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 MB per second) that can be moved over the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video card will be at 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 the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units 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 of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.