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GeForce 9800 GX2 vs Radeon HD 4650 512MB

Intro

The GeForce 9800 GX2 makes use of a 65 nm design. nVidia has set the core speed at 600 MHz. The GDDR3 memory runs at a frequency of 1000 MHz on this specific model. It features 128 SPUs as well as 64 Texture Address Units and 16 ROPs.

Compare all of that to the Radeon HD 4650 512MB, which features a core clock frequency of 600 MHz and a DDR2 memory speed of 500 MHz. It also makes use of a 128-bit memory bus, and makes use of a 55 nm design. It is made up of 320(64x5) SPUs, 32 TAUs, and 8 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 512MB 55 Watts
GeForce 9800 GX2 197 Watts
Difference: 142 Watts (258%)

Memory Bandwidth

Theoretically, the GeForce 9800 GX2 should be a lot faster than the Radeon HD 4650 512MB in general. (explain)

GeForce 9800 GX2 128000 MB/sec
Radeon HD 4650 512MB 16000 MB/sec
Difference: 112000 (700%)

Texel Rate

The GeForce 9800 GX2 should be a lot (more or less 300%) more effective at AF than the Radeon HD 4650 512MB. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
Radeon HD 4650 512MB 19200 Mtexels/sec
Difference: 57600 (300%)

Pixel Rate

The GeForce 9800 GX2 should be quite a bit (about 300%) faster with regards to AA than the Radeon HD 4650 512MB, and also will be capable of handling higher screen resolutions better. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
Radeon HD 4650 512MB 4800 Mpixels/sec
Difference: 14400 (300%)

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 4650 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 4650 512MB
Manufacturer nVidia AMD
Year Mar 2008 Sep 10, 2008
Code Name G92 RV730 PRO
Memory 512 MB (x2) 512 MB
Core Speed 600 MHz (x2) 600 MHz
Memory Speed 2000 MHz (x2) 1000 MHz
Power (Max TDP) 197 watts 55 watts
Bandwidth 128000 MB/sec 16000 MB/sec
Texel Rate 76800 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 19200 Mpixels/sec 4800 Mpixels/sec
Unified Shaders 128 (x2) 320(64x5)
Texture Mapping Units 64 (x2) 32
Render Output Units 16 (x2) 8
Bus Type GDDR3 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: Memory bandwidth is the largest amount of data (in units of megabytes per second) that can be transported past the external memory interface within a second. It is worked out by multiplying the interface width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the 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 number of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

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

Display Prices

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GeForce 9800 GX2

Amazon.com

Check prices at:

Radeon HD 4650 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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