GeForce 8800 GT 512MB vs GeForce GT 240 GDDR5

Intro

Compare those specs to the GeForce GT 240 GDDR5, which has GPU clock speed of 550 MHz, and 512 MB of GDDR5 memory running at 850 MHz through a 128-bit bus. It also 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		70 Watts
GeForce 8800 GT 512MB		105 Watts
	Difference: 35 Watts (50%)

Memory Bandwidth

Performance-wise, the GeForce 8800 GT 512MB should in theory be just a bit better than the GeForce GT 240 GDDR5 in general. (explain)

GeForce 8800 GT 512MB		57600 MB/sec
GeForce GT 240 GDDR5		54400 MB/sec
	Difference: 3200 (6%)

Texel Rate

The GeForce 8800 GT 512MB should be much (about 91%) faster with regards to AF than the GeForce GT 240 GDDR5. (explain)

GeForce 8800 GT 512MB		33600 Mtexels/sec
GeForce GT 240 GDDR5		17600 Mtexels/sec
	Difference: 16000 (91%)

Pixel Rate

The GeForce 8800 GT 512MB will be a lot (approximately 118%) more effective at full screen anti-aliasing than the GeForce GT 240 GDDR5, and also will be able to handle higher resolutions while still performing well. (explain)

GeForce 8800 GT 512MB		9600 Mpixels/sec
GeForce GT 240 GDDR5		4400 Mpixels/sec
	Difference: 5200 (118%)

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 maximum amount of data (in units of megabytes per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.