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GeForce GTX 285 1GB vs GeForce GTX 285 2GB

Intro

The GeForce GTX 285 1GB comes with a core clock speed of 648 MHz and a GDDR3 memory frequency of 1242 MHz. It also uses a 512-bit bus, and makes use of a 55 nm design. It is made up of 240 SPUs, 80 Texture Address Units, and 32 ROPs.

Compare those specifications to the GeForce GTX 285 2GB, which makes use of a 55 nm design. nVidia has clocked the core speed at 648 MHz. The GDDR3 RAM runs at a speed of 1242 MHz on this model. It features 240 SPUs as well as 80 Texture Address Units and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Both cards have the exact same memory bandwidth, so in theory they should have the same performance. (explain)

Texel Rate

Both cards have exactly the same texel fill rate, so in theory they should perform equally good at at AF. (explain)

Pixel Rate

Both cards have exactly the same pixel fill rate, so in theory they should perform equally good at at anti-aliasing, and be capable of handling the same screen resolutions. (explain)

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

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GeForce GTX 285 2GB

Amazon.com

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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 285 2GB
Manufacturer nVidia nVidia
Year January 15, 2009 January 15, 2009
Code Name G200b G200b
Memory 1024 MB 2048 MB
Core Speed 648 MHz 648 MHz
Memory Speed 2484 MHz 2484 MHz
Power (Max TDP) 204 watts 204 watts
Bandwidth 158976 MB/sec 158976 MB/sec
Texel Rate 51840 Mtexels/sec 51840 Mtexels/sec
Pixel Rate 20736 Mpixels/sec 20736 Mpixels/sec
Unified Shaders 240 240
Texture Mapping Units 80 80
Render Output Units 32 32
Bus Type GDDR3 GDDR3
Bus Width 512-bit 512-bit
Fab Process 55 nm 55 nm
Transistors 1400 million 1400 million
Bus PCIe x16 2.0 PCIe x16 2.0
DirectX Version DirectX 10 DirectX 10
OpenGL Version OpenGL 3.1 OpenGL 3.1

Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be transferred past the external memory interface in one second. It is worked out by multiplying the bus width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is calculated by multiplying the total number of texture units of the card by the core clock 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 processed per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the card's 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 fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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GeForce GTX 285 1GB

Amazon.com

Check prices at:

GeForce GTX 285 2GB

Amazon.com

Check prices at:

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.

Comments

2 Responses to “GeForce GTX 285 1GB vs GeForce GTX 285 2GB”
sag-sibil says:

thin compare result shoes that shit on your site because one gig more of memory nowhere does have effect

Nathan says:

1GB of memory to 2gb of memory has a massive effect.

2GB to 3GB has little effect unless you're playing above 1080p, but is good for certain games.

And 3gb to 4gb doesn't matter at all at 1080p, makes a large difference at 2160p(4k)

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