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GeForce 9800 GX2 vs GeForce GTX 275

Intro

The GeForce 9800 GX2 features core clock speeds of 600 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR3 memory. It features 128 SPUs as well as 64 TAUs and 16 ROPs.

Compare that to the GeForce GTX 275, which comes with a core clock speed of 633 MHz and a GDDR3 memory speed of 1134 MHz. It also uses a 448-bit bus, and makes use of a 55 nm design. It is made up of 240 SPUs, 80 TAUs, and 28 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9800 GX2 197 Watts
GeForce GTX 275 219 Watts
Difference: 22 Watts (11%)

Memory Bandwidth

As far as performance goes, the GeForce 9800 GX2 should theoretically be a bit better than the GeForce GTX 275 overall. (explain)

GeForce 9800 GX2 128000 MB/sec
GeForce GTX 275 127008 MB/sec
Difference: 992 (1%)

Texel Rate

The GeForce 9800 GX2 should be a lot (approximately 52%) faster with regards to AF than the GeForce GTX 275. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
GeForce GTX 275 50640 Mtexels/sec
Difference: 26160 (52%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce 9800 GX2 is a better choice, but only just. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
GeForce GTX 275 17724 Mpixels/sec
Difference: 1476 (8%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce 9800 GX2

Amazon.com

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GeForce GTX 275

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

Display Specifications

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Model GeForce 9800 GX2 GeForce GTX 275
Manufacturer nVidia nVidia
Year Mar 2008 April 9, 2009
Code Name G92 G200b
Memory 512 MB (x2) 896 MB
Core Speed 600 MHz (x2) 633 MHz
Memory Speed 2000 MHz (x2) 2268 MHz
Power (Max TDP) 197 watts 219 watts
Bandwidth 128000 MB/sec 127008 MB/sec
Texel Rate 76800 Mtexels/sec 50640 Mtexels/sec
Pixel Rate 19200 Mpixels/sec 17724 Mpixels/sec
Unified Shaders 128 (x2) 240
Texture Mapping Units 64 (x2) 80
Render Output Units 16 (x2) 28
Bus Type GDDR3 GDDR3
Bus Width 256-bit (x2) 448-bit
Fab Process 65 nm 55 nm
Transistors 754 million 1400 million
Bus PCIe x16 2.0 PCIe x16 2.0
DirectX Version DirectX 10 DirectX 10
OpenGL Version OpenGL 3.0 OpenGL 3.1

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be moved across the external memory interface in one second. It's worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. 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 texture map elements (texels) that are applied in one second. This 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 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 that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines 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 rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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GeForce 9800 GX2

Amazon.com

Check prices at:

GeForce GTX 275

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.

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