Radeon HD 6770 1GB vs Radeon R9 295X2

Intro

Compare all of that to the Radeon R9 295X2, which has clock speeds of 1018 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 RAM. It features 2816 SPUs along with 176 TAUs and 64 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB		108 Watts
Radeon R9 295X2		500 Watts
	Difference: 392 Watts (363%)

Memory Bandwidth

As far as performance goes, the Radeon R9 295X2 should theoretically be much superior to the Radeon HD 6770 1GB in general. (explain)

Radeon R9 295X2		640000 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 572800 (852%)

Texel Rate

The Radeon R9 295X2 will be much (more or less 895%) more effective at anisotropic filtering than the Radeon HD 6770 1GB. (explain)

Radeon R9 295X2		358336 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 322336 (895%)

Pixel Rate

The Radeon R9 295X2 will be quite a bit (about 805%) more effective at full screen anti-aliasing than the Radeon HD 6770 1GB, and should be capable of handling higher screen resolutions better. (explain)

Radeon R9 295X2		130304 Mpixels/sec
Radeon HD 6770 1GB		14400 Mpixels/sec
	Difference: 115904 (805%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be moved past the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total amount of texture units 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 processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as 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 memory bandwidth is, the lower the ability to get to the max fill rate.