Radeon HD 6770 1GB vs Radeon R7 260X

Intro

Compare all of that to the Radeon R7 260X, which features a GPU core clock speed of 1100 MHz, and 2048 MB of GDDR5 RAM set to run at 1625 MHz through a 128-bit bus. It also is comprised of 896 SPUs, 56 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB		108 Watts
Radeon R7 260X		115 Watts
	Difference: 7 Watts (6%)

Memory Bandwidth

Theoretically, the Radeon R7 260X should perform much faster than the Radeon HD 6770 1GB overall. (explain)

Radeon R7 260X		104000 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 36800 (55%)

Texel Rate

The Radeon R7 260X will be a lot (approximately 71%) better at AF than the Radeon HD 6770 1GB. (explain)

Radeon R7 260X		61600 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 25600 (71%)

Pixel Rate

The Radeon R7 260X is quite a bit (about 22%) faster with regards to full screen anti-aliasing than the Radeon HD 6770 1GB, and also will be able to handle higher resolutions more effectively. (explain)

Radeon R7 260X		17600 Mpixels/sec
Radeon HD 6770 1GB		14400 Mpixels/sec
	Difference: 3200 (22%)

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 max amount of information (measured in MB per second) that can be transported over the external memory interface within a second. It's worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel 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 ability to get to the max fill rate.