GeForce GTX 465 vs Radeon HD 4830 1GB

Intro

Compare all that to the Radeon HD 4830 1GB, which features a clock frequency of 575 MHz and a GDDR4 memory frequency of 900 MHz. It also uses a 256-bit memory bus, and uses a 55 nm design. It features 640(128x5) SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 1GB		95 Watts
GeForce GTX 465		200 Watts
	Difference: 105 Watts (111%)

Memory Bandwidth

The GeForce GTX 465, in theory, should be much faster than the Radeon HD 4830 1GB in general. (explain)

GeForce GTX 465		102592 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 44992 (78%)

Texel Rate

The GeForce GTX 465 should be quite a bit (more or less 45%) faster with regards to AF than the Radeon HD 4830 1GB. (explain)

GeForce GTX 465		26708 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 8308 (45%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX 465 is the winner, by a large margin. (explain)

GeForce GTX 465		19424 Mpixels/sec
Radeon HD 4830 1GB		9200 Mpixels/sec
	Difference: 10224 (111%)

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

Specifications

Memory Bandwidth: Bandwidth is the largest amount of information (in units of MB per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better 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 applied in one second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher 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 amount of pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units 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 fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.