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GeForce 9800 GTX+ vs Radeon HD 6770

Intro

The GeForce 9800 GTX+ makes use of a 55 nm design. nVidia has set the core frequency at 738 MHz. The GDDR3 memory is set to run at a frequency of 1100 MHz on this particular model. It features 128 SPUs along with 64 TAUs and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 6770, which features a clock speed of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also uses a 128-bit bus, and uses a 40 nm design. It is comprised of 800 SPUs, 40 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 108 Watts
GeForce 9800 GTX+ 145 Watts
Difference: 37 Watts (34%)

Memory Bandwidth

The GeForce 9800 GTX+ should in theory perform a bit faster than the Radeon HD 6770 in general. (explain)

GeForce 9800 GTX+ 70400 MB/sec
Radeon HD 6770 67200 MB/sec
Difference: 3200 (5%)

Texel Rate

The GeForce 9800 GTX+ will be much (about 31%) faster with regards to AF than the Radeon HD 6770. (explain)

GeForce 9800 GTX+ 47232 Mtexels/sec
Radeon HD 6770 36000 Mtexels/sec
Difference: 11232 (31%)

Pixel Rate

The Radeon HD 6770 will be quite a bit (about 22%) more effective at full screen anti-aliasing than the GeForce 9800 GTX+, and also should be able to handle higher screen resolutions better. (explain)

Radeon HD 6770 14400 Mpixels/sec
GeForce 9800 GTX+ 11808 Mpixels/sec
Difference: 2592 (22%)

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 9800 GTX+

Amazon.com

Check prices at:

Radeon HD 6770

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 9800 GTX+ Radeon HD 6770
Manufacturer nVidia AMD
Year July 2008 January 2011
Code Name G92b Juniper XT
Memory 512 MB 512 MB
Core Speed 738 MHz 900 MHz
Memory Speed 2200 MHz 4200 MHz
Power (Max TDP) 145 watts 108 watts
Bandwidth 70400 MB/sec 67200 MB/sec
Texel Rate 47232 Mtexels/sec 36000 Mtexels/sec
Pixel Rate 11808 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 128 800
Texture Mapping Units 64 40
Render Output Units 16 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 40 nm
Transistors 754 million 1040 million
Bus PCIe x16 2.0 PCIe x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the interface width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total amount of texture units by the core clock 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 maximum amount of pixels the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce 9800 GTX+

Amazon.com

Check prices at:

Radeon HD 6770

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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