Radeon HD 6770 vs Radeon R9 M395X

Intro

Compare that to the Radeon R9 M395X, which features GPU core speed of 723 MHz, and 4096 MB of GDDR5 RAM running at 1250 MHz through a 256-bit bus. It also is made up of 2048 SPUs, 128 TAUs, and 32 ROPs.

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

Performance-wise, the Radeon R9 M395X should in theory be quite a bit better 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 should be a lot (approximately 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 is a lot (approximately 61%) better at AA than the Radeon HD 6770, and also capable of handling higher resolutions more effectively. (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 max amount of information (measured in megabytes per second) that can be transferred over the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs 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 output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.