Radeon HD 6770 1GB vs Radeon R7 250

Intro

Compare those specs to the Radeon R7 250, which features a core clock speed of 1000 MHz and a GDDR5 memory speed of 1150 MHz. It also makes use of a 128-bit bus, and uses a 28 nm design. It features 384 SPUs, 24 TAUs, and 8 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250		65 Watts
Radeon HD 6770 1GB		108 Watts
	Difference: 43 Watts (66%)

Memory Bandwidth

Theoretically, the Radeon R7 250 should be a little bit faster than the Radeon HD 6770 1GB overall. (explain)

Radeon R7 250		73600 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 6400 (10%)

Texel Rate

The Radeon HD 6770 1GB should be quite a bit (more or less 50%) more effective at anisotropic filtering than the Radeon R7 250. (explain)

Radeon HD 6770 1GB		36000 Mtexels/sec
Radeon R7 250		24000 Mtexels/sec
	Difference: 12000 (50%)

Pixel Rate

The Radeon HD 6770 1GB should be much (more or less 80%) better at full screen anti-aliasing than the Radeon R7 250, and should be able to handle higher screen resolutions better. (explain)

Radeon HD 6770 1GB		14400 Mpixels/sec
Radeon R7 250		8000 Mpixels/sec
	Difference: 6400 (80%)

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 largest amount of data (counted in MB per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory speed. If the card has DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

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