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GeForce 9800 GTX+ vs Radeon HD 3870 1GB

Intro

The GeForce 9800 GTX+ features a GPU core clock speed of 738 MHz, and the 512 MB of GDDR3 memory is set to run at 1100 MHz through a 256-bit bus. It also is comprised of 128 SPUs, 64 TAUs, and 16 ROPs.

Compare that to the Radeon HD 3870 1GB, which features GPU clock speed of 775 MHz, and 1024 MB of GDDR4 memory running at 1125 MHz through a 256-bit bus. It also 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 1GB 106 Watts
GeForce 9800 GTX+ 145 Watts
Difference: 39 Watts (37%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 3870 1GB should perform a little bit faster than the GeForce 9800 GTX+ in general. (explain)

Radeon HD 3870 1GB 72000 MB/sec
GeForce 9800 GTX+ 70400 MB/sec
Difference: 1600 (2%)

Texel Rate

The GeForce 9800 GTX+ should be quite a bit (approximately 281%) faster with regards to anisotropic filtering than the Radeon HD 3870 1GB. (explain)

GeForce 9800 GTX+ 47232 Mtexels/sec
Radeon HD 3870 1GB 12400 Mtexels/sec
Difference: 34832 (281%)

Pixel Rate

The Radeon HD 3870 1GB should be a small bit (more or less 5%) more effective at full screen anti-aliasing than the GeForce 9800 GTX+, and able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 3870 1GB 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 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 1GB
Manufacturer nVidia AMD
Year July 2008 Nov 19, 2007
Code Name G92b RV670 XT
Memory 512 MB 1024 MB
Core Speed 738 MHz 775 MHz
Memory Speed 2200 MHz 2250 MHz
Power (Max TDP) 145 watts 106 watts
Bandwidth 70400 MB/sec 72000 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 GDDR4
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: Bandwidth is the max amount of information (measured in MB per second) that can be transferred across the external memory interface in a second. It's worked out by multiplying the interface width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called 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 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:

Radeon HD 3870 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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