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GeForce 8800 GT 512MB vs Radeon HD 4770

Intro

The GeForce 8800 GT 512MB has a core clock speed of 600 MHz and a GDDR3 memory frequency of 900 MHz. It also uses a 256-bit bus, and uses a 65 nm design. It is comprised of 112 SPUs, 56 TAUs, and 16 ROPs.

Compare that to the Radeon HD 4770, which comes with clock speeds of 750 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 memory. It features 640(128x5) SPUs as well as 32 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770 80 Watts
GeForce 8800 GT 512MB 105 Watts
Difference: 25 Watts (31%)

Memory Bandwidth

In theory, the GeForce 8800 GT 512MB is 13% quicker than the Radeon HD 4770 in general, because of its greater data rate. (explain)

GeForce 8800 GT 512MB 57600 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 6400 (13%)

Texel Rate

The GeForce 8800 GT 512MB will be much (about 40%) better at anisotropic filtering than the Radeon HD 4770. (explain)

GeForce 8800 GT 512MB 33600 Mtexels/sec
Radeon HD 4770 24000 Mtexels/sec
Difference: 9600 (40%)

Pixel Rate

The Radeon HD 4770 should be a lot (approximately 25%) faster with regards to full screen anti-aliasing than the GeForce 8800 GT 512MB, and capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 4770 12000 Mpixels/sec
GeForce 8800 GT 512MB 9600 Mpixels/sec
Difference: 2400 (25%)

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 GT 512MB

Amazon.com

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Radeon HD 4770

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 GT 512MB Radeon HD 4770
Manufacturer nVidia AMD
Year Oct 2007 Apr 28, 2009
Code Name G92 RV740
Memory 512 MB 512 MB
Core Speed 600 MHz 750 MHz
Memory Speed 1800 MHz 3200 MHz
Power (Max TDP) 105 watts 80 watts
Bandwidth 57600 MB/sec 51200 MB/sec
Texel Rate 33600 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 9600 Mpixels/sec 12000 Mpixels/sec
Unified Shaders 112 640(128x5)
Texture Mapping Units 56 32
Render Output Units 16 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit 128-bit
Fab Process 65 nm 40 nm
Transistors 754 million 826 million
Bus PCIe x16 2.0 PCIe 2.0 x16
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the largest amount of data (measured in megabytes per second) that can be moved past the external memory interface in one second. It's calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, 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 can be applied in one second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the 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 number of pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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GeForce 8800 GT 512MB

Amazon.com

Check prices at:

Radeon HD 4770

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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