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GeForce 9800 GX2 vs Radeon HD 3650

Intro

The GeForce 9800 GX2 has a core clock speed of 600 MHz and a GDDR3 memory speed of 1000 MHz. It also uses a 256-bit memory bus, and uses a 65 nm design. It features 128 SPUs, 64 Texture Address Units, and 16 ROPs.

Compare those specifications to the Radeon HD 3650, which features a clock frequency of 725 MHz and a GDDR4 memory frequency of 800 MHz. It also features a 128-bit memory bus, and makes use of a 55 nm design. It features 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 78 Watts
GeForce 9800 GX2 197 Watts
Difference: 119 Watts (153%)

Memory Bandwidth

In theory, the GeForce 9800 GX2 should be 400% quicker than the Radeon HD 3650 in general, due to its higher data rate. (explain)

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

Texel Rate

The GeForce 9800 GX2 is much (approximately 1224%) better at texture filtering 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 anti-aliasing than the Radeon HD 3650, and also will be capable of handling higher resolutions without losing too much performance. (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 maximum amount of information (in units of MB per second) that can be transferred over the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes 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 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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