GeForce 8800 GTS (G80) 640MB vs Radeon R9 380 4G

Intro

Compare those specifications to the Radeon R9 380 4G, which makes use of a 28 nm design. AMD has set the core speed at 970 MHz. The GDDR5 memory runs at a speed of 1425 MHz on this card. It features 1792 SPUs as well as 112 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GTS (G80) 640MB		143 Watts
Radeon R9 380 4G		190 Watts
	Difference: 47 Watts (33%)

Memory Bandwidth

In theory, the Radeon R9 380 4G should be a lot faster than the GeForce 8800 GTS (G80) 640MB overall. (explain)

Radeon R9 380 4G		182400 MB/sec
GeForce 8800 GTS (G80) 640MB		63360 MB/sec
	Difference: 119040 (188%)

Texel Rate

The Radeon R9 380 4G will be much (more or less 341%) better at anisotropic filtering than the GeForce 8800 GTS (G80) 640MB. (explain)

Radeon R9 380 4G		108640 Mtexels/sec
GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
	Difference: 84016 (341%)

Pixel Rate

The Radeon R9 380 4G should be much (approximately 203%) better at anti-aliasing than the GeForce 8800 GTS (G80) 640MB, and also should be able to handle higher resolutions without slowing down too much. (explain)

Radeon R9 380 4G		31040 Mpixels/sec
GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
	Difference: 20780 (203%)

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 largest amount of data (measured in MB per second) that can be transferred over the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 once 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 AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.