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GeForce 9800 GTX+ vs Radeon HD 3870 X2 1GB

Intro

The GeForce 9800 GTX+ has a GPU core clock speed of 738 MHz, and the 512 MB of GDDR3 memory runs at 1100 MHz through a 256-bit bus. It also features 128 Stream Processors, 64 TAUs, and 16 Raster Operation Units.

Compare those specs to the Radeon HD 3870 X2 1GB, which has a clock frequency of 825 MHz and a GDDR4 memory frequency of 1126 MHz. It also features a 256-bit memory bus, and uses a 55 nm design. It is comprised of 320(64x5) SPUs, 16 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 3870 X2 1GB should in theory be a lot superior to the GeForce 9800 GTX+ overall. (explain)

Radeon HD 3870 X2 1GB 144128 MB/sec
GeForce 9800 GTX+ 70400 MB/sec
Difference: 73728 (105%)

Texel Rate

The GeForce 9800 GTX+ is much (about 79%) faster with regards to AF than the Radeon HD 3870 X2 1GB. (explain)

GeForce 9800 GTX+ 47232 Mtexels/sec
Radeon HD 3870 X2 1GB 26400 Mtexels/sec
Difference: 20832 (79%)

Pixel Rate

The Radeon HD 3870 X2 1GB should be a lot (about 124%) better at anti-aliasing than the GeForce 9800 GTX+, and also able to handle higher screen resolutions more effectively. (explain)

Radeon HD 3870 X2 1GB 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 1GB

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 1GB
Manufacturer nVidia AMD
Year July 2008 Jan 28, 2008
Code Name G92b R680
Memory 512 MB 1024 MB (x2)
Core Speed 738 MHz 825 MHz (x2)
Memory Speed 2200 MHz 2252 MHz (x2)
Power (Max TDP) 145 watts (Unknown) watts
Bandwidth 70400 MB/sec 144128 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 GDDR4
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 maximum amount of information (counted in megabytes per second) that can be transferred past the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

GeForce 9800 GTX+

Amazon.com

Check prices at:

Radeon HD 3870 X2 1GB

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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