GeForce GT 240 GDDR5 vs Radeon R9 380 4G

Intro

Compare all of that to the Radeon R9 380 4G, which uses a 28 nm design. AMD has set the core speed at 970 MHz. The GDDR5 RAM is set to run at a frequency of 1425 MHz on this particular card. It features 1792 SPUs as well as 112 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 240 GDDR5		70 Watts
Radeon R9 380 4G		190 Watts
	Difference: 120 Watts (171%)

Memory Bandwidth

The Radeon R9 380 4G, in theory, should be quite a bit faster than the GeForce GT 240 GDDR5 overall. (explain)

Radeon R9 380 4G		182400 MB/sec
GeForce GT 240 GDDR5		54400 MB/sec
	Difference: 128000 (235%)

Texel Rate

The Radeon R9 380 4G will be a lot (approximately 517%) faster with regards to AF than the GeForce GT 240 GDDR5. (explain)

Radeon R9 380 4G		108640 Mtexels/sec
GeForce GT 240 GDDR5		17600 Mtexels/sec
	Difference: 91040 (517%)

Pixel Rate

The Radeon R9 380 4G is a lot (more or less 605%) more effective at FSAA than the GeForce GT 240 GDDR5, and also will be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon R9 380 4G		31040 Mpixels/sec
GeForce GT 240 GDDR5		4400 Mpixels/sec
	Difference: 26640 (605%)

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 information (in units of megabytes per second) that can be transported over the external memory interface in a second. It's calculated by multiplying the interface width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 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 anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.