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GeForce 9800 GT 1GB vs Radeon HD 7850

Intro

The GeForce 9800 GT 1GB has a GPU core speed of 600 MHz, and the 1024 MB of GDDR3 memory runs at 900 MHz through a 256-bit bus. It also is made up of 112 SPUs, 56 TAUs, and 16 ROPs.

Compare those specs to the Radeon HD 7850, which has GPU clock speed of 860 MHz, and 2048 MB of GDDR5 RAM set to run at 1200 MHz through a 256-bit bus. It also is made up of 1024 SPUs, 64 TAUs, and 32 ROPs.

(No game benchmarks for this combination yet.)

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

Theoretically, the Radeon HD 7850 should perform quite a bit faster 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 much (more or less 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

The Radeon HD 7850 should be much (more or less 187%) faster with regards to full screen anti-aliasing than the GeForce 9800 GT 1GB, and also should be capable of handling higher resolutions without slowing down too much. (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

Amazon.com

Radeon HD 7850

Amazon.com

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

Model GeForce 9800 GT 1GB Radeon HD 7850
Manufacturer nVidia AMD
Year July 2008 March 2012
Code Name G92a/b Pitcairn Pro
Fab Process 65/55 nm 28 nm
Bus PCIe x16 2.0 PCIe 3.0 x16
Memory 1024 MB 2048 MB
Core Speed 600 MHz 860 MHz
Shader Speed 1500 MHz (N/A) MHz
Memory Speed 900 MHz (1800 MHz effective) 1200 MHz (4800 MHz effective)
Unified Shaders 112 1024
Texture Mapping Units 56 64
Render Output Units 16 32
Bus Type GDDR3 GDDR5
Bus Width 256-bit 256-bit
DirectX Version DirectX 10 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2
Power (Max TDP) 105 watts 130 watts
Shader Model 4.0 5.0
Bandwidth 57600 MB/sec 153600 MB/sec
Texel Rate 33600 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 9600 Mpixels/sec 27520 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of information (measured in MB per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the bus width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This 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 processed in one second.

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

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