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GeForce 8800 GTS (G80) 320MB vs Radeon HD 3850 512MB

Intro

The GeForce 8800 GTS (G80) 320MB features a GPU clock speed of 513 MHz, and the 320 MB of GDDR3 memory runs at 792 MHz through a 320-bit bus. It also is made up of 96 Stream Processors, 48 TAUs, and 20 ROPs.

Compare all of that to the Radeon HD 3850 512MB, which comes with a clock speed of 668 MHz and a GDDR3 memory frequency of 828 MHz. It also makes use of a 256-bit bus, and makes use of a 55 nm design. It is made up of 320(64x5) SPUs, 16 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 512MB 75 Watts
GeForce 8800 GTS (G80) 320MB 143 Watts
Difference: 68 Watts (91%)

Memory Bandwidth

The GeForce 8800 GTS (G80) 320MB should in theory perform a little bit faster than the Radeon HD 3850 512MB in general. (explain)

GeForce 8800 GTS (G80) 320MB 63360 MB/sec
Radeon HD 3850 512MB 52992 MB/sec
Difference: 10368 (20%)

Texel Rate

The GeForce 8800 GTS (G80) 320MB will be a lot (about 130%) more effective at AF than the Radeon HD 3850 512MB. (explain)

GeForce 8800 GTS (G80) 320MB 24624 Mtexels/sec
Radeon HD 3850 512MB 10688 Mtexels/sec
Difference: 13936 (130%)

Pixel Rate

The Radeon HD 3850 512MB is a bit (approximately 4%) faster with regards to anti-aliasing than the GeForce 8800 GTS (G80) 320MB, and also will be capable of handling higher resolutions better. (explain)

Radeon HD 3850 512MB 10688 Mpixels/sec
GeForce 8800 GTS (G80) 320MB 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) 320MB

Amazon.com

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Radeon HD 3850 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 8800 GTS (G80) 320MB Radeon HD 3850 512MB
Manufacturer nVidia AMD
Year Feb 2007 Nov 19, 2007
Code Name G80 RV670 PRO
Memory 320 MB 512 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: Memory bandwidth is the max amount of information (counted in MB per second) that can be transferred across the external memory interface within a second. It's calculated by multiplying the bus width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of 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 8800 GTS (G80) 320MB

Amazon.com

Check prices at:

Radeon HD 3850 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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