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GeForce 8800 GTS (G80) 640MB vs Radeon HD 4650 1GB


Intro

The GeForce 8800 GTS (G80) 640MB uses a 90 nm design. nVidia has set the core speed at 513 MHz. The GDDR3 RAM works at a frequency of 792 MHz on this specific card. It features 96 SPUs as well as 48 TAUs and 20 Rasterization Operator Units.

Compare that to the Radeon HD 4650 1GB, which has GPU core speed of 600 MHz, and 1024 MB of GDDR3 RAM set to run at 700 MHz through a 128-bit bus. It also is made up of 320(64x5) SPUs, 32 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB 55 Watts
GeForce 8800 GTS (G80) 640MB 143 Watts
Difference: 88 Watts (160%)

Memory Bandwidth

Performance-wise, the GeForce 8800 GTS (G80) 640MB should theoretically be quite a bit superior to the Radeon HD 4650 1GB in general. (explain)

GeForce 8800 GTS (G80) 640MB 63360 MB/sec
Radeon HD 4650 1GB 22400 MB/sec
Difference: 40960 (183%)

Texel Rate

The GeForce 8800 GTS (G80) 640MB should be quite a bit (about 28%) better at anisotropic filtering than the Radeon HD 4650 1GB. (explain)

GeForce 8800 GTS (G80) 640MB 24624 Mtexels/sec
Radeon HD 4650 1GB 19200 Mtexels/sec
Difference: 5424 (28%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce 8800 GTS (G80) 640MB is superior to the Radeon HD 4650 1GB, by a large margin. (explain)

GeForce 8800 GTS (G80) 640MB 10260 Mpixels/sec
Radeon HD 4650 1GB 4800 Mpixels/sec
Difference: 5460 (114%)

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 8800 GTS (G80) 640MB

Radeon HD 4650 1GB

Specifications

Display Specifications

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Model GeForce 8800 GTS (G80) 640MB Radeon HD 4650 1GB
Manufacturer nVidia AMD
Year Nov 2006 (640) Sep 10, 2008
Code Name G80 RV730 PRO
Memory 640 MB 1024 MB
Core Speed 513 MHz 600 MHz
Memory Speed 1584 MHz 1400 MHz
Power (Max TDP) 143 watts 55 watts
Bandwidth 63360 MB/sec 22400 MB/sec
Texel Rate 24624 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 10260 Mpixels/sec 4800 Mpixels/sec
Unified Shaders 96 320(64x5)
Texture Mapping Units 48 32
Render Output Units 20 8
Bus Type GDDR3 GDDR3
Bus Width 320-bit 128-bit
Fab Process 90 nm 55 nm
Transistors 681 million 514 million
Bus PCIe x16 PCIe 2.0 x16, AGP 8x
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of MB per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This figure is worked out 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 graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs 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 rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

GeForce 8800 GTS (G80) 640MB

Radeon HD 4650 1GB

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