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GeForce 9800 GTX+ vs Radeon HD 3870 X2 512MB

Intro

The GeForce 9800 GTX+ features a clock speed of 738 MHz and a GDDR3 memory speed of 1100 MHz. It also makes use of a 256-bit bus, and makes use of a 55 nm design. It features 128 SPUs, 64 Texture Address Units, and 16 ROPs.

Compare those specs to the Radeon HD 3870 X2 512MB, which comes with core clock speeds of 825 MHz on the GPU, and 900 MHz on the 512 MB of GDDR3 RAM. It features 320(64x5) SPUs as well as 16 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 3870 X2 512MB should perform a lot faster than the GeForce 9800 GTX+ overall. (explain)

Radeon HD 3870 X2 512MB 115200 MB/sec
GeForce 9800 GTX+ 70400 MB/sec
Difference: 44800 (64%)

Texel Rate

The GeForce 9800 GTX+ will be much (more or less 79%) faster with regards to texture filtering than the Radeon HD 3870 X2 512MB. (explain)

GeForce 9800 GTX+ 47232 Mtexels/sec
Radeon HD 3870 X2 512MB 26400 Mtexels/sec
Difference: 20832 (79%)

Pixel Rate

The Radeon HD 3870 X2 512MB should be quite a bit (approximately 124%) more effective at full screen anti-aliasing than the GeForce 9800 GTX+, and also should be able to handle higher resolutions better. (explain)

Radeon HD 3870 X2 512MB 26400 Mpixels/sec
GeForce 9800 GTX+ 11808 Mpixels/sec
Difference: 14592 (124%)

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

Check prices at:

Radeon HD 3870 X2 512MB

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 9800 GTX+ Radeon HD 3870 X2 512MB
Manufacturer nVidia AMD
Year July 2008 Jan 28, 2008
Code Name G92b R680
Memory 512 MB 512 MB (x2)
Core Speed 738 MHz 825 MHz (x2)
Memory Speed 2200 MHz 1800 MHz (x2)
Power (Max TDP) 145 watts (Unknown) watts
Bandwidth 70400 MB/sec 115200 MB/sec
Texel Rate 47232 Mtexels/sec 26400 Mtexels/sec
Pixel Rate 11808 Mpixels/sec 26400 Mpixels/sec
Unified Shaders 128 320(64x5) (x2)
Texture Mapping Units 64 16 (x2)
Render Output Units 16 16 (x2)
Bus Type GDDR3 GDDR3
Bus Width 256-bit 256-bit (x2)
Fab Process 55 nm 55 nm
Transistors 754 million (Unknown) million
Bus PCIe x16 2.0 PCIe 2.0 x16/(internal PCIe 1.1 x16)
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be transported across the external memory interface in a second. It is worked out by multiplying the bus width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, most notably 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

Hide Prices

GeForce 9800 GTX+

Amazon.com

Check prices at:

Radeon HD 3870 X2 512MB

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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