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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 RAM runs at a frequency of 792 MHz on this particular model. It features 96 SPUs as well as 48 TAUs and 20 Rasterization Operator Units.

Compare all that to the Radeon HD 3850 256MB, which features GPU core speed of 668 MHz, and 256 MB of GDDR3 RAM running at 828 MHz through a 256-bit bus. It also is comprised of 320(64x5) SPUs, 16 TAUs, 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

Theoretically, the GeForce 8800 GTS (G80) 640MB should be just a bit faster than 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 will be quite a bit (approximately 130%) better at texture filtering 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

If using a high screen resolution is important to you, then the Radeon HD 3850 256MB is a better choice, though not by far. (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

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 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 data (in units of MB per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total texture units by the core 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 per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

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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