Radeon HD 4890 1GB vs Radeon R9 M295X

Intro

Compare all of that to the Radeon R9 M295X, which features a GPU core clock speed of 750 MHz, and 4096 MB of GDDR5 memory running at 1375 MHz through a 256-bit bus. It also is comprised of 2048 Stream Processors, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M295X		125 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 65 Watts (52%)

Memory Bandwidth

As far as performance goes, the Radeon R9 M295X should theoretically be much superior to the Radeon HD 4890 1GB overall. (explain)

Radeon R9 M295X		176000 MB/sec
Radeon HD 4890 1GB		124800 MB/sec
	Difference: 51200 (41%)

Texel Rate

The Radeon R9 M295X will be quite a bit (about 140%) better at anisotropic filtering than the Radeon HD 4890 1GB. (explain)

Radeon R9 M295X		96000 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 56000 (140%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R9 M295X is the winner, and very much so. (explain)

Radeon R9 M295X		24000 Mpixels/sec
Radeon HD 4890 1GB		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 largest amount of data (in units of megabytes per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.