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GeForce 9800 GX2 vs Radeon HD 4670 512MB

Intro

The GeForce 9800 GX2 comes with a GPU core clock speed of 600 MHz, and the 512 MB of GDDR3 memory runs at 1000 MHz through a 256-bit bus. It also is made up of 128 Stream Processors, 64 Texture Address Units, and 16 ROPs.

Compare those specs to the Radeon HD 4670 512MB, which makes use of a 55 nm design. AMD has set the core frequency at 750 MHz. The GDDR4/GDDR3/DDR3/DDR2 RAM runs at a speed of 1000 MHz on this model. It features 320(64x5) SPUs along with 32 Texture Address Units and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 512MB 70 Watts
GeForce 9800 GX2 197 Watts
Difference: 127 Watts (181%)

Memory Bandwidth

Performance-wise, the GeForce 9800 GX2 should theoretically be a lot superior to the Radeon HD 4670 512MB overall. (explain)

GeForce 9800 GX2 128000 MB/sec
Radeon HD 4670 512MB 32000 MB/sec
Difference: 96000 (300%)

Texel Rate

The GeForce 9800 GX2 is quite a bit (about 220%) more effective at anisotropic filtering than the Radeon HD 4670 512MB. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
Radeon HD 4670 512MB 24000 Mtexels/sec
Difference: 52800 (220%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce 9800 GX2 is a better choice, by a large margin. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
Radeon HD 4670 512MB 6000 Mpixels/sec
Difference: 13200 (220%)

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 4670 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 GX2 Radeon HD 4670 512MB
Manufacturer nVidia AMD
Year Mar 2008 Sep 10, 2008
Code Name G92 RV730 XT
Memory 512 MB (x2) 512 MB
Core Speed 600 MHz (x2) 750 MHz
Memory Speed 2000 MHz (x2) 2000 MHz
Power (Max TDP) 197 watts 70 watts
Bandwidth 128000 MB/sec 32000 MB/sec
Texel Rate 76800 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 19200 Mpixels/sec 6000 Mpixels/sec
Unified Shaders 128 (x2) 320(64x5)
Texture Mapping Units 64 (x2) 32
Render Output Units 16 (x2) 8
Bus Type GDDR3 GDDR4/GDDR3/DDR3/DDR2
Bus Width 256-bit (x2) 128-bit
Fab Process 65 nm 55 nm
Transistors 754 million 514 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 maximum amount of data (in units of megabytes per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, it should 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 anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This 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 graphics 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 number of pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number 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 drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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GeForce 9800 GX2

Amazon.com

Check prices at:

Radeon HD 4670 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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