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GeForce GTX 285 1GB vs Geforce GTX 680

Intro

The GeForce GTX 285 1GB has clock speeds of 648 MHz on the GPU, and 1242 MHz on the 1024 MB of GDDR3 RAM. It features 240 SPUs as well as 80 TAUs and 32 Rasterization Operator Units.

Compare all that to the Geforce GTX 680, which has a core clock speed of 1006 MHz and a GDDR5 memory speed of 1502 MHz. It also uses a 256-bit memory bus, and makes use of a 28 nm design. It is made up of 1536 SPUs, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

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(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

As far as performance goes, the Geforce GTX 680 should in theory be much superior to the GeForce GTX 285 1GB in general. (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 quite a bit (approximately 148%) more effective at 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 (more or less 55%) more effective at FSAA than the GeForce GTX 285 1GB, and should be able to handle higher screen resolutions better. (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

Display Prices

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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

Display 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
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 2484 MHz 6008 MHz
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: Memory bandwidth is the largest amount of information (in units of MB per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. If it uses DDR type 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 AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per 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 better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on 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 ability to reach the maximum fill rate.

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