Radeon HD 7770 vs Radeon R9 M395X

Intro

Compare those specifications to the Radeon R9 M395X, which has core clock speeds of 723 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs along with 128 TAUs and 32 Rasterization Operator Units.

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

Performance-wise, the Radeon R9 M395X should theoretically be much better than the Radeon HD 7770 overall. (explain)

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

Texel Rate

The Radeon R9 M395X will be quite a bit (about 131%) better 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

If using a high resolution is important to you, then the Radeon R9 M395X is superior to the Radeon HD 7770, by far. (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: Memory bandwidth is the largest amount of information (in units of megabytes per second) that can be transferred past the external memory interface in one second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the 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 are applied in one second. This number is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.