GeForce GT 240 GDDR5 1GB vs Radeon HD 7790

Intro

Compare that to the Radeon HD 7790, which features core clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 1024 MB of GDDR5 RAM. It features 896 SPUs as well as 56 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 240 GDDR5 1GB		70 Watts
Radeon HD 7790		85 Watts
	Difference: 15 Watts (21%)

Memory Bandwidth

The Radeon HD 7790 should in theory perform a lot faster than the GeForce GT 240 GDDR5 1GB overall. (explain)

Radeon HD 7790		96000 MB/sec
GeForce GT 240 GDDR5 1GB		54400 MB/sec
	Difference: 41600 (76%)

Texel Rate

The Radeon HD 7790 is quite a bit (about 218%) better at anisotropic filtering than the GeForce GT 240 GDDR5 1GB. (explain)

Radeon HD 7790		56000 Mtexels/sec
GeForce GT 240 GDDR5 1GB		17600 Mtexels/sec
	Difference: 38400 (218%)

Pixel Rate

The Radeon HD 7790 will be a lot (more or less 264%) more effective at full screen anti-aliasing than the GeForce GT 240 GDDR5 1GB, and also should be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 7790		16000 Mpixels/sec
GeForce GT 240 GDDR5 1GB		4400 Mpixels/sec
	Difference: 11600 (264%)

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 data (counted in MB per second) that can be moved past the external memory interface in a second. It's calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 per second. This number is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the graphics card will be at 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 chip could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.