GeForce GT 640 DDR3 vs GeForce GTX 295

Intro

Compare all that to the GeForce GTX 295, which features GPU clock speed of 576 MHz, and 896 MB of GDDR3 RAM set to run at 999 MHz through a 448-bit bus. It also features 240 Stream Processors, 80 TAUs, and 28 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce GTX 295		289 Watts
	Difference: 224 Watts (345%)

Memory Bandwidth

The GeForce GTX 295 should in theory perform much faster than the GeForce GT 640 DDR3 in general. (explain)

GeForce GTX 295		223776 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 166752 (292%)

Texel Rate

The GeForce GTX 295 is much (about 220%) faster with regards to texture filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX 295		92160 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 63360 (220%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce GTX 295 is superior to the GeForce GT 640 DDR3, by a large margin. (explain)

GeForce GTX 295		32256 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 17856 (124%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the largest amount of data (counted in MB per second) that can be transferred across the external memory interface in one second. The number is calculated by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.