GeForce 8800 GT 256MB vs Radeon R9 380 2G

Intro

Compare those specs to the Radeon R9 380 2G, which has a clock speed of 970 MHz and a GDDR5 memory speed of 1425 MHz. It also makes use of a 256-bit bus, and uses a 28 nm design. It features 1792 SPUs, 112 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GT 256MB		105 Watts
Radeon R9 380 2G		190 Watts
	Difference: 85 Watts (81%)

Memory Bandwidth

The Radeon R9 380 2G, in theory, should be quite a bit faster than the GeForce 8800 GT 256MB overall. (explain)

Radeon R9 380 2G		182400 MB/sec
GeForce 8800 GT 256MB		44800 MB/sec
	Difference: 137600 (307%)

Texel Rate

The Radeon R9 380 2G should be much (approximately 223%) more effective at texture filtering than the GeForce 8800 GT 256MB. (explain)

Radeon R9 380 2G		108640 Mtexels/sec
GeForce 8800 GT 256MB		33600 Mtexels/sec
	Difference: 75040 (223%)

Pixel Rate

The Radeon R9 380 2G will be quite a bit (more or less 223%) better at AA than the GeForce 8800 GT 256MB, and also will be capable of handling higher screen resolutions better. (explain)

Radeon R9 380 2G		31040 Mpixels/sec
GeForce 8800 GT 256MB		9600 Mpixels/sec
	Difference: 21440 (223%)

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 information (counted in MB per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.