Radeon HD 5770 vs Radeon R7 250

Intro

Compare those specifications to the Radeon R7 250, which features clock speeds of 1000 MHz on the GPU, and 1150 MHz on the 1024 MB of GDDR5 RAM. It features 384 SPUs as well as 24 TAUs and 8 Rasterization Operator 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

The Radeon HD 5770 should theoretically perform a small 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 is quite a bit (about 42%) faster with regards to 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 is quite a bit (more or less 70%) more effective at AA than the Radeon R7 250, and will be capable of handling higher screen 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 largest amount of information (counted in megabytes per second) that can be transferred over the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.