Radeon HD 4770 vs Radeon R9 M295X

Intro

Compare those specifications to the Radeon R9 M295X, which has a GPU core clock speed of 750 MHz, and 4096 MB of GDDR5 memory set to run at 1375 MHz through a 256-bit bus. It also is made up 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 4770		80 Watts
Radeon R9 M295X		125 Watts
	Difference: 45 Watts (56%)

Memory Bandwidth

Performance-wise, the Radeon R9 M295X should in theory be a lot superior to the Radeon HD 4770 overall. (explain)

Radeon R9 M295X		176000 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 124800 (244%)

Texel Rate

The Radeon R9 M295X is a lot (about 300%) more effective at anisotropic filtering than the Radeon HD 4770. (explain)

Radeon R9 M295X		96000 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 72000 (300%)

Pixel Rate

The Radeon R9 M295X is much (approximately 100%) more effective at AA than the Radeon HD 4770, and will be able to handle higher resolutions while still performing well. (explain)

Radeon R9 M295X		24000 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 12000 (100%)

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 max amount of information (counted in MB per second) that can be transported across the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's 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 texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units 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 many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.