Radeon HD 4770 vs Radeon R7 250X 2GB

Intro

Compare all of that to the Radeon R7 250X 2GB, which comes with clock speeds of 1000 MHz on the GPU, and 1125 MHz on the 2048 MB of GDDR5 memory. It features 640 SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
Radeon R7 250X 2GB		95 Watts
	Difference: 15 Watts (19%)

Memory Bandwidth

In theory, the Radeon R7 250X 2GB should be much faster than the Radeon HD 4770 overall. (explain)

Radeon R7 250X 2GB		72000 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 20800 (41%)

Texel Rate

The Radeon R7 250X 2GB should be much (approximately 67%) faster with regards to AF than the Radeon HD 4770. (explain)

Radeon R7 250X 2GB		40000 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 16000 (67%)

Pixel Rate

The Radeon R7 250X 2GB is quite a bit (approximately 33%) more effective at AA than the Radeon HD 4770, and also will be capable of handling higher resolutions while still performing well. (explain)

Radeon R7 250X 2GB		16000 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 4000 (33%)

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 max amount of data (in units of megabytes 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 RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's 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 amount of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.