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GeForce 9800 GX2 vs Radeon HD 3650

Intro

The GeForce 9800 GX2 makes use of a 65 nm design. nVidia has clocked the core speed at 600 MHz. The GDDR3 memory runs at a frequency of 1000 MHz on this card. It features 128 SPUs along with 64 TAUs and 16 ROPs.

Compare those specifications to the Radeon HD 3650, which comes with clock speeds of 725 MHz on the GPU, and 800 MHz on the 1024 MB of GDDR4 RAM. It features 120(24x5) SPUs along with 8 Texture Address Units and 4 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Theoretically, the GeForce 9800 GX2 should be quite a bit faster than the Radeon HD 3650 in general. (explain)

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

Texel Rate

The GeForce 9800 GX2 should be much (about 1224%) faster with regards to AF than the Radeon HD 3650. (explain)

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

Pixel Rate

The GeForce 9800 GX2 will be quite a bit (about 562%) faster with regards to FSAA than the Radeon HD 3650, and should be able to handle higher screen resolutions more effectively. (explain)

GeForce 9800 GX2 19200 Mpixels/sec
Radeon HD 3650 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

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
Manufacturer nVidia AMD
Year Mar 2008 2008
Code Name G92 RV635 PRO
Memory 512 MB (x2) 1024 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 GDDR4
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: Memory bandwidth is the maximum amount of data (in units of megabytes per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This is worked out by multiplying the total number of texture units by the core 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 in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of 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

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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