GeForce GTX 285 1GB vs Geforce GTX 690

Intro

Compare those specifications to the Geforce GTX 690, which has core speeds of 915 MHz on the GPU, and 1502 MHz on the 2048 MB of GDDR5 RAM. It features 1536 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 285 1GB		204 Watts
Geforce GTX 690		300 Watts
	Difference: 96 Watts (47%)

Memory Bandwidth

Theoretically speaking, the Geforce GTX 690 will be 142% faster than the GeForce GTX 285 1GB overall, because of its greater data rate. (explain)

Geforce GTX 690		384512 MB/sec
GeForce GTX 285 1GB		158976 MB/sec
	Difference: 225536 (142%)

Texel Rate

The Geforce GTX 690 will be much (approximately 352%) more effective at texture filtering than the GeForce GTX 285 1GB. (explain)

Geforce GTX 690		234240 Mtexels/sec
GeForce GTX 285 1GB		51840 Mtexels/sec
	Difference: 182400 (352%)

Pixel Rate

The Geforce GTX 690 will be quite a bit (about 182%) more effective at FSAA than the GeForce GTX 285 1GB, and also capable of handling higher screen resolutions without slowing down too much. (explain)

Geforce GTX 690		58560 Mpixels/sec
GeForce GTX 285 1GB		20736 Mpixels/sec
	Difference: 37824 (182%)

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 max amount of data (measured in megabytes per second) that can be transferred past the external memory interface in one second. The number is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher 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 a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.