Radeon HD 6770 vs Radeon R9 M395X

Intro

Compare those specifications to the Radeon R9 M395X, which comes with a clock speed of 723 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 256-bit memory bus, and makes use of a 28 nm design. It is made up 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

The Radeon R9 M395X should in theory perform much faster than the Radeon HD 6770 overall. (explain)

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

Texel Rate

The Radeon R9 M395X is much (about 157%) more effective 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 is a lot (approximately 61%) better at FSAA than the Radeon HD 6770, and also capable of handling higher resolutions better. (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: Bandwidth is the maximum amount of data (in units of MB per second) that can be moved over the external memory interface in one second. It is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total number 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 in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.