Radeon HD 5770 vs Radeon R7 250

Intro

Compare all that to the Radeon R7 250, which comes with a clock speed of 1000 MHz and a GDDR5 memory speed of 1150 MHz. It also uses a 128-bit bus, and makes use of a 28 nm design. It is made up of 384 SPUs, 24 Texture Address Units, and 8 ROPs.

Display Graphs

Hide Graphs

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

Theoretically, the Radeon HD 5770 should perform a little bit faster 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 quite a bit (approximately 42%) more effective at AF 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 should be much (approximately 70%) better at AA than the Radeon R7 250, and will be able to handle higher resolutions more effectively. (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 maximum amount of data (measured in MB per second) that can be transferred across the external memory interface within a second. The number is calculated by multiplying the bus width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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