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GeForce 9800 GX2 vs Radeon HD 3650 512MB

Intro

The GeForce 9800 GX2 comes with core speeds of 600 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR3 memory. It features 128 SPUs as well as 64 Texture Address Units and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 3650 512MB, which has GPU core speed of 725 MHz, and 512 MB of GDDR3 memory running at 800 MHz through a 128-bit bus. It also is comprised of 120(24x5) SPUs, 8 TAUs, and 4 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650 512MB 78 Watts
GeForce 9800 GX2 197 Watts
Difference: 119 Watts (153%)

Memory Bandwidth

Performance-wise, the GeForce 9800 GX2 should in theory be much superior to the Radeon HD 3650 512MB in general. (explain)

GeForce 9800 GX2 128000 MB/sec
Radeon HD 3650 512MB 25600 MB/sec
Difference: 102400 (400%)

Texel Rate

The GeForce 9800 GX2 should be a lot (approximately 1224%) faster with regards to anisotropic filtering than the Radeon HD 3650 512MB. (explain)

GeForce 9800 GX2 76800 Mtexels/sec
Radeon HD 3650 512MB 5800 Mtexels/sec
Difference: 71000 (1224%)

Pixel Rate

The GeForce 9800 GX2 is quite a bit (more or less 562%) faster with regards to anti-aliasing than the Radeon HD 3650 512MB, and also will be able to handle higher resolutions while still performing well. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
Radeon HD 3650 512MB 2900 Mpixels/sec
Difference: 16300 (562%)

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 3650 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 3650 512MB
Manufacturer nVidia AMD
Year Mar 2008 2008
Code Name G92 RV635 PRO
Memory 512 MB (x2) 512 MB
Core Speed 600 MHz (x2) 725 MHz
Memory Speed 2000 MHz (x2) 1600 MHz
Power (Max TDP) 197 watts 78 watts
Bandwidth 128000 MB/sec 25600 MB/sec
Texel Rate 76800 Mtexels/sec 5800 Mtexels/sec
Pixel Rate 19200 Mpixels/sec 2900 Mpixels/sec
Unified Shaders 128 (x2) 120(24x5)
Texture Mapping Units 64 (x2) 8
Render Output Units 16 (x2) 4
Bus Type GDDR3 GDDR3
Bus Width 256-bit (x2) 128-bit
Fab Process 65 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 largest amount of data (measured in MB per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, the result 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 higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total number of texture units by the core 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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GeForce 9800 GX2

Amazon.com

Check prices at:

Radeon HD 3650 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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