Radeon HD 7770 vs Radeon R9 M390X

Intro

Compare those specs to the Radeon R9 M390X, which features a GPU core clock speed of 723 MHz, and 4096 MB of GDDR5 RAM set to run at 1250 MHz through a 256-bit bus. It also is comprised of 2048 Stream Processors, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
Radeon R9 M390X		125 Watts
	Difference: 45 Watts (56%)

Memory Bandwidth

The Radeon R9 M390X should in theory perform a lot faster than the Radeon HD 7770 in general. (explain)

Radeon R9 M390X		160000 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 88000 (122%)

Texel Rate

The Radeon R9 M390X is a lot (more or less 131%) more effective at texture filtering than the Radeon HD 7770. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 52544 (131%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon R9 M390X is a better choice, by a large margin. (explain)

Radeon R9 M390X		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 data (counted in MB per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the bus width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This figure 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill 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.