GeForce 8800 GT 256MB vs Radeon R9 M385X

Intro

Compare all of that to the Radeon R9 M385X, which has core clock speeds of 1100 MHz on the GPU, and 1500 MHz on the 4096 MB of GDDR5 RAM. It features 896 SPUs along with 56 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon R9 M385X should be 114% quicker than the GeForce 8800 GT 256MB overall, due to its higher data rate. (explain)

Radeon R9 M385X		96000 MB/sec
GeForce 8800 GT 256MB		44800 MB/sec
	Difference: 51200 (114%)

Texel Rate

The Radeon R9 M385X will be much (approximately 83%) better at anisotropic filtering than the GeForce 8800 GT 256MB. (explain)

Radeon R9 M385X		61600 Mtexels/sec
GeForce 8800 GT 256MB		33600 Mtexels/sec
	Difference: 28000 (83%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 M385X is the winner, and very much so. (explain)

Radeon R9 M385X		17600 Mpixels/sec
GeForce 8800 GT 256MB		9600 Mpixels/sec
	Difference: 8000 (83%)

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 megabytes per second) that can be transferred 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. In the case of DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is calculated by multiplying the total number of texture units by the core 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 in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.