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GeForce 9800 GTX+ vs Radeon HD 3870 512MB

Intro

The GeForce 9800 GTX+ uses a 55 nm design. nVidia has set the core speed at 738 MHz. The GDDR3 RAM works at a speed of 1100 MHz on this model. It features 128 SPUs as well as 64 TAUs and 16 ROPs.

Compare that to the Radeon HD 3870 512MB, which features a clock frequency of 775 MHz and a GDDR3 memory frequency of 900 MHz. It also features a 256-bit memory bus, and uses a 55 nm design. It is made up of 320(64x5) SPUs, 16 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3870 512MB 106 Watts
GeForce 9800 GTX+ 145 Watts
Difference: 39 Watts (37%)

Memory Bandwidth

The GeForce 9800 GTX+ should in theory perform quite a bit faster than the Radeon HD 3870 512MB in general. (explain)

GeForce 9800 GTX+ 70400 MB/sec
Radeon HD 3870 512MB 57600 MB/sec
Difference: 12800 (22%)

Texel Rate

The GeForce 9800 GTX+ will be a lot (more or less 281%) more effective at AF than the Radeon HD 3870 512MB. (explain)

GeForce 9800 GTX+ 47232 Mtexels/sec
Radeon HD 3870 512MB 12400 Mtexels/sec
Difference: 34832 (281%)

Pixel Rate

The Radeon HD 3870 512MB is a little bit (about 5%) more effective at anti-aliasing than the GeForce 9800 GTX+, and will be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 3870 512MB 12400 Mpixels/sec
GeForce 9800 GTX+ 11808 Mpixels/sec
Difference: 592 (5%)

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.

Price Comparison

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GeForce 9800 GTX+

Amazon.com

Check prices at:

Radeon HD 3870 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 512MB
Manufacturer nVidia AMD
Year July 2008 Nov 19, 2007
Code Name G92b RV670 XT
Memory 512 MB 512 MB
Core Speed 738 MHz 775 MHz
Memory Speed 2200 MHz 1800 MHz
Power (Max TDP) 145 watts 106 watts
Bandwidth 70400 MB/sec 57600 MB/sec
Texel Rate 47232 Mtexels/sec 12400 Mtexels/sec
Pixel Rate 11808 Mpixels/sec 12400 Mpixels/sec
Unified Shaders 128 320(64x5)
Texture Mapping Units 64 16
Render Output Units 16 16
Bus Type GDDR3 GDDR3
Bus Width 256-bit 256-bit
Fab Process 55 nm 55 nm
Transistors 754 million (Unknown) million
Bus PCIe x16 2.0 PCIe 2.0 x16/AGP 8x
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 (measured in MB per second) that can be transported past the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This figure is calculated 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out 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 outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

GeForce 9800 GTX+

Amazon.com

Check prices at:

Radeon HD 3870 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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