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GeForce 8800 GTS (G80) 640MB vs Radeon HD 3850 256MB

Intro

The GeForce 8800 GTS (G80) 640MB makes use of a 90 nm design. nVidia has clocked the core frequency at 513 MHz. The GDDR3 memory runs at a frequency of 792 MHz on this particular card. It features 96 SPUs along with 48 TAUs and 20 Rasterization Operator Units.

Compare those specifications to the Radeon HD 3850 256MB, which has core speeds of 668 MHz on the GPU, and 828 MHz on the 256 MB of GDDR3 memory. It features 320(64x5) SPUs as well as 16 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 256MB 75 Watts
GeForce 8800 GTS (G80) 640MB 143 Watts
Difference: 68 Watts (91%)

Memory Bandwidth

As far as performance goes, the GeForce 8800 GTS (G80) 640MB should in theory be a bit superior to the Radeon HD 3850 256MB in general. (explain)

GeForce 8800 GTS (G80) 640MB 63360 MB/sec
Radeon HD 3850 256MB 52992 MB/sec
Difference: 10368 (20%)

Texel Rate

The GeForce 8800 GTS (G80) 640MB should be much (more or less 130%) faster with regards to AF than the Radeon HD 3850 256MB. (explain)

GeForce 8800 GTS (G80) 640MB 24624 Mtexels/sec
Radeon HD 3850 256MB 10688 Mtexels/sec
Difference: 13936 (130%)

Pixel Rate

The Radeon HD 3850 256MB will be a small bit (more or less 4%) better at AA than the GeForce 8800 GTS (G80) 640MB, and capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 3850 256MB 10688 Mpixels/sec
GeForce 8800 GTS (G80) 640MB 10260 Mpixels/sec
Difference: 428 (4%)

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.

Price Comparison

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GeForce 8800 GTS (G80) 640MB

Amazon.com

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Radeon HD 3850 256MB

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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 8800 GTS (G80) 640MB Radeon HD 3850 256MB
Manufacturer nVidia AMD
Year Nov 2006 (640) Nov 19, 2007
Code Name G80 RV670 PRO
Memory 640 MB 256 MB
Core Speed 513 MHz 668 MHz
Memory Speed 1584 MHz 1656 MHz
Power (Max TDP) 143 watts 75 watts
Bandwidth 63360 MB/sec 52992 MB/sec
Texel Rate 24624 Mtexels/sec 10688 Mtexels/sec
Pixel Rate 10260 Mpixels/sec 10688 Mpixels/sec
Unified Shaders 96 320(64x5)
Texture Mapping Units 48 16
Render Output Units 20 16
Bus Type GDDR3 GDDR3
Bus Width 320-bit 256-bit
Fab Process 90 nm 55 nm
Transistors 681 million (Unknown) million
Bus PCIe x16 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 (measured in MB per second) that can be transported past the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip 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 amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel 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 reach the max fill rate.

Display Prices

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GeForce 8800 GTS (G80) 640MB

Amazon.com

Check prices at:

Radeon HD 3850 256MB

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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