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GeForce GTX 285 1GB vs Geforce GTX 680

Intro

The GeForce GTX 285 1GB has a GPU clock speed of 648 MHz, and the 1024 MB of GDDR3 RAM runs at 1242 MHz through a 512-bit bus. It also features 240 SPUs, 80 TAUs, and 32 ROPs.

Compare all of that to the Geforce GTX 680, which uses a 28 nm design. nVidia has set the core frequency at 1006 MHz. The GDDR5 RAM is set to run at a frequency of 1502 MHz on this particular card. It features 1536 SPUs as well as 128 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 680 195 Watts
GeForce GTX 285 1GB 204 Watts
Difference: 9 Watts (5%)

Memory Bandwidth

In theory, the Geforce GTX 680 is 21% faster than the GeForce GTX 285 1GB overall, due to its greater data rate. (explain)

Geforce GTX 680 192256 MB/sec
GeForce GTX 285 1GB 158976 MB/sec
Difference: 33280 (21%)

Texel Rate

The Geforce GTX 680 is quite a bit (about 148%) faster with regards to anisotropic filtering than the GeForce GTX 285 1GB. (explain)

Geforce GTX 680 128768 Mtexels/sec
GeForce GTX 285 1GB 51840 Mtexels/sec
Difference: 76928 (148%)

Pixel Rate

The Geforce GTX 680 should be much (about 55%) more effective at anti-aliasing than the GeForce GTX 285 1GB, and also able to handle higher screen resolutions without slowing down too much. (explain)

Geforce GTX 680 32192 Mpixels/sec
GeForce GTX 285 1GB 20736 Mpixels/sec
Difference: 11456 (55%)

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

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GeForce GTX 285 1GB

Amazon.com

Geforce GTX 680

Amazon.com

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce GTX 285 1GB Geforce GTX 680
Manufacturer nVidia nVidia
Year January 15, 2009 March 2012
Code Name G200b GK104
Memory 1024 MB 2048 MB
Core Speed 648 MHz 1006 MHz
Memory Speed 2484 MHz 6008 MHz
Power (Max TDP) 204 watts 195 watts
Bandwidth 158976 MB/sec 192256 MB/sec
Texel Rate 51840 Mtexels/sec 128768 Mtexels/sec
Pixel Rate 20736 Mpixels/sec 32192 Mpixels/sec
Unified Shaders 240 1536
Texture Mapping Units 80 128
Render Output Units 32 32
Bus Type GDDR3 GDDR5
Bus Width 512-bit 256-bit
Fab Process 55 nm 28 nm
Transistors 1400 million 3540 million
Bus PCIe x16 2.0 PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.0
OpenGL Version OpenGL 3.1 OpenGL 4.2

Memory Bandwidth: Bandwidth is the max amount of data (in units of MB per second) that can be transferred past the external memory interface within a second. It's calculated by multiplying the bus width by the speed of its memory. If it uses DDR RAM, it should 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 high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied 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 figure is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

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