Radeon HD 5770 vs Radeon R7 250

Intro

Compare all that to the Radeon R7 250, which has a core clock frequency of 1000 MHz and a GDDR5 memory frequency of 1150 MHz. It also features a 128-bit bus, and uses a 28 nm design. It is made up of 384 SPUs, 24 TAUs, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250		65 Watts
Radeon HD 5770		108 Watts
	Difference: 43 Watts (66%)

Memory Bandwidth

As far as performance goes, the Radeon HD 5770 should in theory be a bit better than the Radeon R7 250 overall. (explain)

Radeon HD 5770		76800 MB/sec
Radeon R7 250		73600 MB/sec
	Difference: 3200 (4%)

Texel Rate

The Radeon HD 5770 will be much (approximately 42%) more effective at anisotropic filtering than the Radeon R7 250. (explain)

Radeon HD 5770		34000 Mtexels/sec
Radeon R7 250		24000 Mtexels/sec
	Difference: 10000 (42%)

Pixel Rate

The Radeon HD 5770 will be quite a bit (about 70%) more effective at full screen anti-aliasing than the Radeon R7 250, and also should be able to handle higher screen resolutions better. (explain)

Radeon HD 5770		13600 Mpixels/sec
Radeon R7 250		8000 Mpixels/sec
	Difference: 5600 (70%)

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 data (in units of MB per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the interface width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the 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 amount of pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.