GeForce GTX 285 2GB vs GeForce GTX 480

Intro

Compare all of that to the GeForce GTX 480, which features GPU core speed of 700 MHz, and 1536 MB of GDDR5 memory set to run at 924 MHz through a 384-bit bus. It also is comprised of 480 Stream Processors, 60 Texture Address Units, and 48 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 285 2GB		204 Watts
GeForce GTX 480		250 Watts
	Difference: 46 Watts (23%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 480 should in theory be a bit better than the GeForce GTX 285 2GB in general. (explain)

GeForce GTX 480		177408 MB/sec
GeForce GTX 285 2GB		158976 MB/sec
	Difference: 18432 (12%)

Texel Rate

The GeForce GTX 285 2GB will be quite a bit (approximately 23%) more effective at texture filtering than the GeForce GTX 480. (explain)

GeForce GTX 285 2GB		51840 Mtexels/sec
GeForce GTX 480		42000 Mtexels/sec
	Difference: 9840 (23%)

Pixel Rate

The GeForce GTX 480 is quite a bit (more or less 62%) faster with regards to anti-aliasing than the GeForce GTX 285 2GB, and will be capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 480		33600 Mpixels/sec
GeForce GTX 285 2GB		20736 Mpixels/sec
	Difference: 12864 (62%)

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 largest amount of data (in units of MB per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This is worked out 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 graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called 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 potential to reach the max fill rate.