GeForce 9800 GTX vs Radeon R9 M395X

Intro

Compare those specs to the Radeon R9 M395X, which features a clock frequency of 723 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 256-bit bus, and uses a 28 nm design. It is comprised of 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M395X		125 Watts
GeForce 9800 GTX		140 Watts
	Difference: 15 Watts (12%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 M395X should be 127% faster than the GeForce 9800 GTX overall, because of its higher bandwidth. (explain)

Radeon R9 M395X		160000 MB/sec
GeForce 9800 GTX		70400 MB/sec
	Difference: 89600 (127%)

Texel Rate

The Radeon R9 M395X will be quite a bit (more or less 114%) better at anisotropic filtering than the GeForce 9800 GTX. (explain)

Radeon R9 M395X		92544 Mtexels/sec
GeForce 9800 GTX		43200 Mtexels/sec
	Difference: 49344 (114%)

Pixel Rate

The Radeon R9 M395X should be a lot (approximately 114%) faster with regards to FSAA than the GeForce 9800 GTX, and should be capable of handling higher screen resolutions better. (explain)

Radeon R9 M395X		23136 Mpixels/sec
GeForce 9800 GTX		10800 Mpixels/sec
	Difference: 12336 (114%)

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: Bandwidth is the max amount of information (measured in MB per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at 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 card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends 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.