GeForce GT 640 DDR3 vs GeForce GTX 295

Intro

Compare all of that to the GeForce GTX 295, which has core speeds of 576 MHz on the GPU, and 999 MHz on the 896 MB of GDDR3 RAM. It features 240 SPUs along with 80 TAUs and 28 Rasterization Operator 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 theoretically be much faster than the GeForce GT 640 DDR3 overall. (explain)

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

Texel Rate

The GeForce GTX 295 will be much (more or less 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

The GeForce GTX 295 should be a lot (about 124%) faster with regards to anti-aliasing than the GeForce GT 640 DDR3, and also should be capable of handling higher resolutions without slowing down too much. (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 information (counted in MB per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster 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 applied per second. This is worked out by multiplying the total number of texture units of the card 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 a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of 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 quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.