GeForce GTX 285 1GB vs GeForce GTX 465

Intro

Compare that to the GeForce GTX 465, which has a core clock frequency of 607 MHz and a GDDR5 memory speed of 802 MHz. It also makes use of a 256-bit bus, and uses a 40 nm design. It features 352 SPUs, 44 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 465		200 Watts
GeForce GTX 285 1GB		204 Watts
	Difference: 4 Watts (2%)

Memory Bandwidth

In theory, the GeForce GTX 285 1GB should be quite a bit faster than the GeForce GTX 465 in general. (explain)

GeForce GTX 285 1GB		158976 MB/sec
GeForce GTX 465		102592 MB/sec
	Difference: 56384 (55%)

Texel Rate

The GeForce GTX 285 1GB will be a lot (approximately 94%) more effective at anisotropic filtering than the GeForce GTX 465. (explain)

GeForce GTX 285 1GB		51840 Mtexels/sec
GeForce GTX 465		26708 Mtexels/sec
	Difference: 25132 (94%)

Pixel Rate

The GeForce GTX 285 1GB will be a small bit (about 7%) more effective at full screen anti-aliasing than the GeForce GTX 465, and able to handle higher resolutions more effectively. (explain)

GeForce GTX 285 1GB		20736 Mpixels/sec
GeForce GTX 465		19424 Mpixels/sec
	Difference: 1312 (7%)

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 information (in units of MB per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This number is worked out by multiplying the total number of texture units by the core clock 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core speed of the card. 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 fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.