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GeForce 9800 GTX+ vs GeForce 9800 GX2

Intro

The GeForce 9800 GTX+ uses a 55 nm design. nVidia has set the core speed at 738 MHz. The GDDR3 RAM is set to run at a speed of 1100 MHz on this particular card. It features 128 SPUs as well as 64 TAUs and 16 Rasterization Operator Units.

Compare those specifications to the GeForce 9800 GX2, which comes with core clock speeds of 600 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR3 RAM. It features 128 SPUs as well as 64 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9800 GTX+ 145 Watts
GeForce 9800 GX2 197 Watts
Difference: 52 Watts (36%)

Memory Bandwidth

As far as performance goes, the GeForce 9800 GX2 should theoretically be quite a bit better than the GeForce 9800 GTX+ in general. (explain)

GeForce 9800 GX2 128000 MB/sec
GeForce 9800 GTX+ 70400 MB/sec
Difference: 57600 (82%)

Texel Rate

The GeForce 9800 GX2 should be a lot (approximately 63%) more effective at texture filtering than the GeForce 9800 GTX+. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
GeForce 9800 GTX+ 47232 Mtexels/sec
Difference: 29568 (63%)

Pixel Rate

The GeForce 9800 GX2 is much (more or less 63%) faster with regards to full screen anti-aliasing than the GeForce 9800 GTX+, and also will be capable of handling higher screen resolutions without slowing down too much. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
GeForce 9800 GTX+ 11808 Mpixels/sec
Difference: 7392 (63%)

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 GTX+

Amazon.com

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GeForce 9800 GX2

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 9800 GTX+ GeForce 9800 GX2
Manufacturer nVidia nVidia
Year July 2008 Mar 2008
Code Name G92b G92
Memory 512 MB 512 MB (x2)
Core Speed 738 MHz 600 MHz (x2)
Memory Speed 2200 MHz 2000 MHz (x2)
Power (Max TDP) 145 watts 197 watts
Bandwidth 70400 MB/sec 128000 MB/sec
Texel Rate 47232 Mtexels/sec 76800 Mtexels/sec
Pixel Rate 11808 Mpixels/sec 19200 Mpixels/sec
Unified Shaders 128 128 (x2)
Texture Mapping Units 64 64 (x2)
Render Output Units 16 16 (x2)
Bus Type GDDR3 GDDR3
Bus Width 256-bit 256-bit (x2)
Fab Process 55 nm 65 nm
Transistors 754 million 754 million
Bus PCIe x16 2.0 PCIe x16 2.0
DirectX Version DirectX 10 DirectX 10
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in MB per second) that can be moved across the external memory interface in one second. It's worked out by multiplying the interface width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output 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 get to the maximum fill rate.

Display Prices

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GeForce 9800 GTX+

Amazon.com

Check prices at:

GeForce 9800 GX2

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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