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GeForce 9800 GX2 vs Radeon HD 3650

Intro

The GeForce 9800 GX2 features a clock speed of 600 MHz and a GDDR3 memory speed 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 3650, which comes with GPU core speed of 725 MHz, and 1024 MB of GDDR4 memory running at 800 MHz through a 128-bit bus. It also is comprised of 120(24x5) Stream Processors, 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

In theory, 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 a lot (more or less 1224%) better at 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 is much (more or less 562%) faster with regards to FSAA than the Radeon HD 3650, and able to handle higher 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: Bandwidth is the largest amount of data (in units of MB per second) that can be transferred across the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster 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 in one second. This number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory 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 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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