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GeForce 9800 GX2 vs Radeon HD 3650 512MB

Intro

The GeForce 9800 GX2 features a GPU clock speed of 600 MHz, and the 512 MB of GDDR3 RAM is set to run at 1000 MHz through a 256-bit bus. It also features 128 Stream Processors, 64 TAUs, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 3650 512MB, which has a clock speed of 725 MHz and a GDDR3 memory frequency of 800 MHz. It also uses a 128-bit bus, and makes use of a 55 nm design. It is comprised of 120(24x5) SPUs, 8 Texture Address Units, and 4 ROPs.

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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

Theoretically, the GeForce 9800 GX2 should perform quite a bit faster than the Radeon HD 3650 512MB overall. (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 (more or less 1224%) better at AF 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

If running with high levels of AA is important to you, then the GeForce 9800 GX2 is superior to the Radeon HD 3650 512MB, by a large margin. (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 max amount of information (counted in megabytes per second) that can be transferred over the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of 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 also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory 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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