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GeForce 9500 GT 512MB GDDR3 vs GeForce 9800 GX2

Intro

The GeForce 9500 GT 512MB GDDR3 makes use of a 55 nm design. nVidia has set the core speed at 550 MHz. The GDDR3 RAM runs at a frequency of 800 MHz on this particular card. It features 32 SPUs along with 16 Texture Address Units and 8 Rasterization Operator Units.

Compare those specifications to the GeForce 9800 GX2, which has a GPU core clock speed of 600 MHz, and 512 MB of GDDR3 RAM set to run at 1000 MHz through a 256-bit bus. It also is made up of 128 SPUs, 64 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9500 GT 512MB GDDR3 50 Watts
GeForce 9800 GX2 197 Watts
Difference: 147 Watts (294%)

Memory Bandwidth

Theoretically, the GeForce 9800 GX2 should be quite a bit faster than the GeForce 9500 GT 512MB GDDR3 in general. (explain)

GeForce 9800 GX2 128000 MB/sec
GeForce 9500 GT 512MB GDDR3 25600 MB/sec
Difference: 102400 (400%)

Texel Rate

The GeForce 9800 GX2 should be much (more or less 773%) more effective at AF than the GeForce 9500 GT 512MB GDDR3. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
GeForce 9500 GT 512MB GDDR3 8800 Mtexels/sec
Difference: 68000 (773%)

Pixel Rate

The GeForce 9800 GX2 is much (approximately 336%) more effective at anti-aliasing than the GeForce 9500 GT 512MB GDDR3, and should be able to handle higher resolutions without losing too much performance. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
GeForce 9500 GT 512MB GDDR3 4400 Mpixels/sec
Difference: 14800 (336%)

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 9500 GT 512MB GDDR3

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.

Specifications

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Model GeForce 9500 GT 512MB GDDR3 GeForce 9800 GX2
Manufacturer nVidia nVidia
Year July 2008 Mar 2008
Code Name G96b G92
Memory 512 MB 512 MB (x2)
Core Speed 550 MHz 600 MHz (x2)
Memory Speed 1600 MHz 2000 MHz (x2)
Power (Max TDP) 50 watts 197 watts
Bandwidth 25600 MB/sec 128000 MB/sec
Texel Rate 8800 Mtexels/sec 76800 Mtexels/sec
Pixel Rate 4400 Mpixels/sec 19200 Mpixels/sec
Unified Shaders 32 128 (x2)
Texture Mapping Units 16 64 (x2)
Render Output Units 8 16 (x2)
Bus Type GDDR3 GDDR3
Bus Width 128-bit 256-bit (x2)
Fab Process 55 nm 65 nm
Transistors 314 million 754 million
Bus PCIe x16 2.0, PCI PCIe x16 2.0
DirectX Version DirectX 10 DirectX 10
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the largest amount of data (in units of MB per second) that can be transported over the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also 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, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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GeForce 9500 GT 512MB GDDR3

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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