GeForce 9800 GTX+ vs Radeon HD 4830 1GB

Intro

Compare those specifications to the Radeon HD 4830 1GB, which has a core clock speed of 575 MHz and a GDDR4 memory frequency of 900 MHz. It also features a 256-bit memory bus, and uses a 55 nm design. It is comprised of 640(128x5) SPUs, 32 TAUs, 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 9800 GTX+		145 Watts
	Difference: 50 Watts (53%)

Memory Bandwidth

The GeForce 9800 GTX+ should in theory perform a lot faster than the Radeon HD 4830 1GB overall. (explain)

GeForce 9800 GTX+		70400 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 12800 (22%)

Texel Rate

The GeForce 9800 GTX+ will be quite a bit (approximately 157%) more effective at texture filtering than the Radeon HD 4830 1GB. (explain)

GeForce 9800 GTX+		47232 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 28832 (157%)

Pixel Rate

The GeForce 9800 GTX+ should be quite a bit (about 28%) faster with regards to full screen anti-aliasing than the Radeon HD 4830 1GB, and capable of handling higher resolutions without losing too much performance. (explain)

GeForce 9800 GTX+		11808 Mpixels/sec
Radeon HD 4830 1GB		9200 Mpixels/sec
	Difference: 2608 (28%)

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 maximum amount of data (in units of megabytes per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR type 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 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 calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at handling 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 that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.