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GeForce GT 430 1GB vs Radeon HD 4850 512MB

Intro

The GeForce GT 430 1GB comes with a GPU core clock speed of 700 MHz, and the 1024 MB of GDDR3 RAM runs at 900 MHz through a 128-bit bus. It also features 96 SPUs, 16 TAUs, and 4 Raster Operation Units.

Compare those specifications to the Radeon HD 4850 512MB, which features a clock speed of 625 MHz and a GDDR3 memory frequency of 993 MHz. It also features a 256-bit bus, and makes use of a 55 nm design. It is made up of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 430 1GB 60 Watts
Radeon HD 4850 512MB 110 Watts
Difference: 50 Watts (83%)

Memory Bandwidth

In theory, the Radeon HD 4850 512MB is 121% quicker than the GeForce GT 430 1GB overall, because of its greater data rate. (explain)

Radeon HD 4850 512MB 63552 MB/sec
GeForce GT 430 1GB 28800 MB/sec
Difference: 34752 (121%)

Texel Rate

The Radeon HD 4850 512MB will be quite a bit (approximately 123%) better at AF than the GeForce GT 430 1GB. (explain)

Radeon HD 4850 512MB 25000 Mtexels/sec
GeForce GT 430 1GB 11200 Mtexels/sec
Difference: 13800 (123%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 4850 512MB is a better choice, by a large margin. (explain)

Radeon HD 4850 512MB 10000 Mpixels/sec
GeForce GT 430 1GB 2800 Mpixels/sec
Difference: 7200 (257%)

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 GT 430 1GB

Amazon.com

Radeon HD 4850 512MB

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 GT 430 1GB Radeon HD 4850 512MB
Manufacturer nVidia AMD
Year October 2010 Jun 25, 2008
Code Name GF108 RV770 PRO
Fab Process 40 nm 55 nm
Bus PCIe x16 PCIe 2.0 x16
Memory 1024 MB 512 MB
Core Speed 700 MHz 625 MHz
Shader Speed 1400 MHz (N/A) MHz
Memory Speed 900 MHz (1800 MHz effective) 993 MHz (1986 MHz effective)
Unified Shaders 96 800(160x5)
Texture Mapping Units 16 40
Render Output Units 4 16
Bus Type GDDR3 GDDR3
Bus Width 128-bit 256-bit
DirectX Version DirectX 11 DirectX 10.1
OpenGL Version OpenGL 4.1 OpenGL 3.0
Power (Max TDP) 60 watts 110 watts
Shader Model 5.0 4.1
Bandwidth 28800 MB/sec 63552 MB/sec
Texel Rate 11200 Mtexels/sec 25000 Mtexels/sec
Pixel Rate 2800 Mpixels/sec 10000 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of MB per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the interface width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip 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 colour ROPs by the the core clock speed. 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 lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

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