Radeon HD 6770 vs Radeon R9 M395X

Intro

Compare those specs to the Radeon R9 M395X, which comes with a GPU core clock speed of 723 MHz, and 4096 MB of GDDR5 memory set to run at 1250 MHz through a 256-bit bus. It also is comprised of 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770		108 Watts
Radeon R9 M395X		125 Watts
	Difference: 17 Watts (16%)

Memory Bandwidth

In theory, the Radeon R9 M395X should be much faster than the Radeon HD 6770 in general. (explain)

Radeon R9 M395X		160000 MB/sec
Radeon HD 6770		67200 MB/sec
	Difference: 92800 (138%)

Texel Rate

The Radeon R9 M395X is a lot (about 157%) better at anisotropic filtering than the Radeon HD 6770. (explain)

Radeon R9 M395X		92544 Mtexels/sec
Radeon HD 6770		36000 Mtexels/sec
	Difference: 56544 (157%)

Pixel Rate

The Radeon R9 M395X should be much (more or less 61%) more effective at FSAA than the Radeon HD 6770, and able to handle higher screen resolutions while still performing well. (explain)

Radeon R9 M395X		23136 Mpixels/sec
Radeon HD 6770		14400 Mpixels/sec
	Difference: 8736 (61%)

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 (measured in megabytes per second) that can be transported past the external memory interface within a second. It's calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total number of texture units by the core clock 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 most pixels that the graphics chip 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 colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.