GeForce GT 240 GDDR5 vs Radeon HD 7790

Intro

Compare those specifications to the Radeon HD 7790, which has core clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 1024 MB of GDDR5 memory. It features 896 SPUs along with 56 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Performance-wise, the Radeon HD 7790 should theoretically be much better than the GeForce GT 240 GDDR5 overall. (explain)

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

Texel Rate

The Radeon HD 7790 is quite a bit (approximately 218%) more effective at texture filtering than the GeForce GT 240 GDDR5. (explain)

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

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 7790 is a better choice, and very much so. (explain)

Radeon HD 7790		16000 Mpixels/sec
GeForce GT 240 GDDR5		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: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be transported past the external memory interface within a second. It's worked out by multiplying the interface width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 again. If it uses 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, High Dynamic Range and higher screen resolutions.

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

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