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GeForce 9800 GX2 vs Radeon HD 4870 1GB

Intro

The GeForce 9800 GX2 features a clock frequency of 600 MHz and a GDDR3 memory frequency of 1000 MHz. It also makes use of a 256-bit bus, and makes use of a 65 nm design. It is made up of 128 SPUs, 64 TAUs, and 16 ROPs.

Compare those specifications to the Radeon HD 4870 1GB, which features GPU core speed of 750 MHz, and 1024 MB of GDDR5 RAM set to run at 900 MHz through a 256-bit bus. It also is made up of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4870 1GB 150 Watts
GeForce 9800 GX2 197 Watts
Difference: 47 Watts (31%)

Memory Bandwidth

The GeForce 9800 GX2 should in theory perform a little bit faster than the Radeon HD 4870 1GB overall. (explain)

GeForce 9800 GX2 128000 MB/sec
Radeon HD 4870 1GB 115200 MB/sec
Difference: 12800 (11%)

Texel Rate

The GeForce 9800 GX2 should be a lot (about 156%) more effective at AF than the Radeon HD 4870 1GB. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
Radeon HD 4870 1GB 30000 Mtexels/sec
Difference: 46800 (156%)

Pixel Rate

The GeForce 9800 GX2 should be a lot (more or less 60%) more effective at full screen anti-aliasing than the Radeon HD 4870 1GB, and will be capable of handling higher screen resolutions better. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
Radeon HD 4870 1GB 12000 Mpixels/sec
Difference: 7200 (60%)

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 GX2

Amazon.com

Check prices at:

Radeon HD 4870 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 GX2 Radeon HD 4870 1GB
Manufacturer nVidia AMD
Year Mar 2008 Jun 25, 2008
Code Name G92 RV770 XT
Memory 512 MB (x2) 1024 MB
Core Speed 600 MHz (x2) 750 MHz
Memory Speed 2000 MHz (x2) 3600 MHz
Power (Max TDP) 197 watts 150 watts
Bandwidth 128000 MB/sec 115200 MB/sec
Texel Rate 76800 Mtexels/sec 30000 Mtexels/sec
Pixel Rate 19200 Mpixels/sec 12000 Mpixels/sec
Unified Shaders 128 (x2) 800(160x5)
Texture Mapping Units 64 (x2) 40
Render Output Units 16 (x2) 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 256-bit
Fab Process 65 nm 55 nm
Transistors 754 million 956 million
Bus PCIe x16 2.0 PCIe 2.0 x16
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the max amount of data (measured in MB per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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GeForce 9800 GX2

Amazon.com

Check prices at:

Radeon HD 4870 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.

Comments

One Response to “GeForce 9800 GX2 vs Radeon HD 4870 1GB”
Is 9800gx2 good enough for 6k or not? says:

[...] PC , PS2 But man 4870 ki takkar ka hy GeForce 9800 GX2 vs Radeon HD 4870 1GB – Performance Comparison Benchmarks @ Hardware Compare [...]

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