Radeon HD 4890 2GB vs Radeon R9 M295X

Intro

Compare all of that to the Radeon R9 M295X, which has GPU core speed of 750 MHz, and 4096 MB of GDDR5 RAM running at 1375 MHz through a 256-bit bus. It also is made up of 2048 SPUs, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M295X		125 Watts
Radeon HD 4890 2GB		190 Watts
	Difference: 65 Watts (52%)

Memory Bandwidth

The Radeon R9 M295X should theoretically be much faster than the Radeon HD 4890 2GB in general. (explain)

Radeon R9 M295X		176000 MB/sec
Radeon HD 4890 2GB		124800 MB/sec
	Difference: 51200 (41%)

Texel Rate

The Radeon R9 M295X will be much (more or less 140%) faster with regards to AF than the Radeon HD 4890 2GB. (explain)

Radeon R9 M295X		96000 Mtexels/sec
Radeon HD 4890 2GB		40000 Mtexels/sec
	Difference: 56000 (140%)

Pixel Rate

The Radeon R9 M295X will be much (about 50%) faster with regards to full screen anti-aliasing than the Radeon HD 4890 2GB, and also should be capable of handling higher resolutions more effectively. (explain)

Radeon R9 M295X		24000 Mpixels/sec
Radeon HD 4890 2GB		16000 Mpixels/sec
	Difference: 8000 (50%)

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 data (measured in megabytes per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the interface width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better 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 are processed in one second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory in a 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 - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.