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GeForce GTX 285 1GB vs Geforce GTX 680

Intro

The GeForce GTX 285 1GB features 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 is made up of 240 Stream Processors, 80 TAUs, and 32 Raster Operation Units.

Compare that to the Geforce GTX 680, which comes with clock speeds of 1006 MHz on the GPU, and 1502 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs as well as 128 TAUs and 32 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

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

Theoretically speaking, the Geforce GTX 680 should be a lot faster than the GeForce GTX 285 1GB overall. (explain)

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

Texel Rate

The Geforce GTX 680 should be a lot (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 is a lot (approximately 55%) more effective at full screen anti-aliasing than the GeForce GTX 285 1GB, and also will be capable of handling higher screen resolutions while still performing well. (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

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

Model GeForce GTX 285 1GB Geforce GTX 680
Manufacturer nVidia nVidia
Year January 15, 2009 March 2012
Code Name G200b GK104
Fab Process 55 nm 28 nm
Bus PCIe x16 2.0 PCIe 3.0 x16
Memory 1024 MB 2048 MB
Core Speed 648 MHz 1006 MHz
Shader Speed 1476 MHz 1006 MHz
Memory Speed 1242 MHz (2484 MHz effective) 1502 MHz (6008 MHz effective)
Unified Shaders 240 1536
Texture Mapping Units 80 128
Render Output Units 32 32
Bus Type GDDR3 GDDR5
Bus Width 512-bit 256-bit
DirectX Version DirectX 10 DirectX 11.0
OpenGL Version OpenGL 3.1 OpenGL 4.2
Power (Max TDP) 204 watts 195 watts
Shader Model 4.0 5.0
Bandwidth 158976 MB/sec 192256 MB/sec
Texel Rate 51840 Mtexels/sec 128768 Mtexels/sec
Pixel Rate 20736 Mpixels/sec 32192 Mpixels/sec

Memory Bandwidth: Bandwidth is the largest amount of information (in units of megabytes per second) that can be transported over the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated 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 outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

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