Radeon HD 7770 vs Radeon R9 M395X

Intro

Compare those specs to the Radeon R9 M395X, which has clock speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
Radeon R9 M395X		125 Watts
	Difference: 45 Watts (56%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 M395X should be 122% quicker than the Radeon HD 7770 in general, because of its greater bandwidth. (explain)

Radeon R9 M395X		160000 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 88000 (122%)

Texel Rate

The Radeon R9 M395X will be much (about 131%) more effective at anisotropic filtering than the Radeon HD 7770. (explain)

Radeon R9 M395X		92544 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 52544 (131%)

Pixel Rate

The Radeon R9 M395X is quite a bit (about 45%) better at FSAA than the Radeon HD 7770, and able to handle higher screen resolutions better. (explain)

Radeon R9 M395X		23136 Mpixels/sec
Radeon HD 7770		16000 Mpixels/sec
	Difference: 7136 (45%)

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 information (measured in MB per second) that can be moved across the external memory interface in one second. It's worked out by multiplying the interface width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 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 texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.