GeForce 9800 GTX vs GeForce GT 240 GDDR5 1GB

Intro

Compare all that to the GeForce GT 240 GDDR5 1GB, which comes with a clock speed of 550 MHz and a GDDR5 memory frequency of 850 MHz. It also makes use of a 128-bit bus, and uses a 40 nm design. It is made up of 96 SPUs, 32 TAUs, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 240 GDDR5 1GB		70 Watts
GeForce 9800 GTX		140 Watts
	Difference: 70 Watts (100%)

Memory Bandwidth

In theory, the GeForce 9800 GTX is 29% quicker than the GeForce GT 240 GDDR5 1GB overall, because of its greater data rate. (explain)

GeForce 9800 GTX		70400 MB/sec
GeForce GT 240 GDDR5 1GB		54400 MB/sec
	Difference: 16000 (29%)

Texel Rate

The GeForce 9800 GTX should be much (approximately 145%) more effective at AF than the GeForce GT 240 GDDR5 1GB. (explain)

GeForce 9800 GTX		43200 Mtexels/sec
GeForce GT 240 GDDR5 1GB		17600 Mtexels/sec
	Difference: 25600 (145%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce 9800 GTX is superior to the GeForce GT 240 GDDR5 1GB, and very much so. (explain)

GeForce 9800 GTX		10800 Mpixels/sec
GeForce GT 240 GDDR5 1GB		4400 Mpixels/sec
	Difference: 6400 (145%)

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 (counted in megabytes per second) that can be transported past the external memory interface in one second. The number is calculated by multiplying the interface width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling 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 that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called 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 of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.