Radeon HD 6770 1GB vs Radeon R5 M255

Intro

Compare those specifications to the Radeon R5 M255, which uses a 28 nm design. AMD has set the core frequency at 940 MHz. The DDR3 RAM runs at a speed of 1000 MHz on this card. It features 320 SPUs along with 20 Texture Address Units and 8 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 6770 1GB, in theory, should be much faster than the Radeon R5 M255 overall. (explain)

Radeon HD 6770 1GB		67200 MB/sec
Radeon R5 M255		16000 MB/sec
	Difference: 51200 (320%)

Texel Rate

The Radeon HD 6770 1GB is much (about 91%) better at anisotropic filtering than the Radeon R5 M255. (explain)

Radeon HD 6770 1GB		36000 Mtexels/sec
Radeon R5 M255		18800 Mtexels/sec
	Difference: 17200 (91%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 6770 1GB is superior to the Radeon R5 M255, by far. (explain)

Radeon HD 6770 1GB		14400 Mpixels/sec
Radeon R5 M255		7520 Mpixels/sec
	Difference: 6880 (91%)

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 megabytes per second) that can be transferred across the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better 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 can be processed per second. This number is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics 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 most pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.