Radeon HD 4850 512MB vs Radeon R9 380 4G

Intro

Compare all that to the Radeon R9 380 4G, which features clock speeds of 970 MHz on the GPU, and 1425 MHz on the 4096 MB of GDDR5 RAM. It features 1792 SPUs as well as 112 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 512MB		110 Watts
Radeon R9 380 4G		190 Watts
	Difference: 80 Watts (73%)

Memory Bandwidth

Theoretically, the Radeon R9 380 4G should perform much faster than the Radeon HD 4850 512MB overall. (explain)

Radeon R9 380 4G		182400 MB/sec
Radeon HD 4850 512MB		63552 MB/sec
	Difference: 118848 (187%)

Texel Rate

The Radeon R9 380 4G should be much (more or less 335%) faster with regards to texture filtering than the Radeon HD 4850 512MB. (explain)

Radeon R9 380 4G		108640 Mtexels/sec
Radeon HD 4850 512MB		25000 Mtexels/sec
	Difference: 83640 (335%)

Pixel Rate

The Radeon R9 380 4G will be much (more or less 210%) faster with regards to full screen anti-aliasing than the Radeon HD 4850 512MB, and capable of handling higher resolutions without slowing down too much. (explain)

Radeon R9 380 4G		31040 Mpixels/sec
Radeon HD 4850 512MB		10000 Mpixels/sec
	Difference: 21040 (210%)

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 maximum amount of information (measured in megabytes per second) that can be transported past the external memory interface in a second. It's worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, it must 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 anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total amount of texture units by the core clock 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 maximum amount of pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the clock 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 fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.