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GeForce 8800 GTS (G92) vs Radeon HD 4850 X2 1GB

Intro

The GeForce 8800 GTS (G92) comes with a GPU core clock speed of 650 MHz, and the 512 MB of GDDR3 RAM runs at 970 MHz through a 256-bit bus. It also is made up of 128 Stream Processors, 64 TAUs, and 16 ROPs.

Compare that to the Radeon HD 4850 X2 1GB, which has a clock speed of 625 MHz and a GDDR3 memory speed of 993 MHz. It also makes use of a 256-bit bus, and uses a 55 nm design. It features 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GTS (G92) 135 Watts
Radeon HD 4850 X2 1GB 250 Watts
Difference: 115 Watts (85%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4850 X2 1GB should in theory be much better than the GeForce 8800 GTS (G92) in general. (explain)

Radeon HD 4850 X2 1GB 127104 MB/sec
GeForce 8800 GTS (G92) 62080 MB/sec
Difference: 65024 (105%)

Texel Rate

The Radeon HD 4850 X2 1GB will be a small bit (more or less 20%) more effective at AF than the GeForce 8800 GTS (G92). (explain)

Radeon HD 4850 X2 1GB 50000 Mtexels/sec
GeForce 8800 GTS (G92) 41600 Mtexels/sec
Difference: 8400 (20%)

Pixel Rate

The Radeon HD 4850 X2 1GB will be a lot (more or less 92%) faster with regards to full screen anti-aliasing than the GeForce 8800 GTS (G92), and also capable of handling higher resolutions while still performing well. (explain)

Radeon HD 4850 X2 1GB 20000 Mpixels/sec
GeForce 8800 GTS (G92) 10400 Mpixels/sec
Difference: 9600 (92%)

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 8800 GTS (G92)

Amazon.com

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Radeon HD 4850 X2 1GB

Amazon.com

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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 (G92) Radeon HD 4850 X2 1GB
Manufacturer nVidia AMD
Year Dec 2007 Nov 7, 2008
Code Name G92 R700
Memory 512 MB 1024 MB (x2)
Core Speed 650 MHz 625 MHz (x2)
Memory Speed 1940 MHz 1986 MHz (x2)
Power (Max TDP) 135 watts 250 watts
Bandwidth 62080 MB/sec 127104 MB/sec
Texel Rate 41600 Mtexels/sec 50000 Mtexels/sec
Pixel Rate 10400 Mpixels/sec 20000 Mpixels/sec
Unified Shaders 128 800(160x5) (x2)
Texture Mapping Units 64 40 (x2)
Render Output Units 16 16 (x2)
Bus Type GDDR3 GDDR3
Bus Width 256-bit 256-bit (x2)
Fab Process 65 nm 55 nm
Transistors 754 million 956 million
Bus PCIe x16 2.0 PCIe 2.0 x16 (PCIe bridge)
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 across the external memory interface in a second. It is worked out by multiplying the interface width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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GeForce 8800 GTS (G92)

Amazon.com

Check prices at:

Radeon HD 4850 X2 1GB

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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