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GeForce 9800 GT 1GB vs Radeon HD 7850

Intro

The GeForce 9800 GT 1GB uses a 65/55 nm design. nVidia has set the core frequency at 600 MHz. The GDDR3 RAM works at a speed of 900 MHz on this particular model. It features 112 SPUs along with 56 Texture Address Units and 16 Rasterization Operator Units.

Compare that to the Radeon HD 7850, which features a clock frequency of 860 MHz and a GDDR5 memory frequency of 1200 MHz. It also uses a 256-bit memory bus, and uses a 28 nm design. It is comprised of 1024 SPUs, 64 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9800 GT 1GB 105 Watts
Radeon HD 7850 130 Watts
Difference: 25 Watts (24%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7850 should in theory be quite a bit better than the GeForce 9800 GT 1GB in general. (explain)

Radeon HD 7850 153600 MB/sec
GeForce 9800 GT 1GB 57600 MB/sec
Difference: 96000 (167%)

Texel Rate

The Radeon HD 7850 will be a lot (approximately 64%) more effective at texture filtering than the GeForce 9800 GT 1GB. (explain)

Radeon HD 7850 55040 Mtexels/sec
GeForce 9800 GT 1GB 33600 Mtexels/sec
Difference: 21440 (64%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7850 is the winner, and very much so. (explain)

Radeon HD 7850 27520 Mpixels/sec
GeForce 9800 GT 1GB 9600 Mpixels/sec
Difference: 17920 (187%)

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

GeForce 9800 GT 1GB

Radeon HD 7850

Specifications

Display Specifications

Hide Specifications

Model GeForce 9800 GT 1GB Radeon HD 7850
Manufacturer nVidia AMD
Year July 2008 March 2012
Code Name G92a/b Pitcairn Pro
Memory 1024 MB 2048 MB
Core Speed 600 MHz 860 MHz
Memory Speed 1800 MHz 4800 MHz
Power (Max TDP) 105 watts 130 watts
Bandwidth 57600 MB/sec 153600 MB/sec
Texel Rate 33600 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 9600 Mpixels/sec 27520 Mpixels/sec
Unified Shaders 112 1024
Texture Mapping Units 56 64
Render Output Units 16 32
Bus Type GDDR3 GDDR5
Bus Width 256-bit 256-bit
Fab Process 65/55 nm 28 nm
Transistors 754 million 2800 million
Bus PCIe x16 2.0 PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the interface width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

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

GeForce 9800 GT 1GB

Radeon HD 7850

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