GeForce 9800 GTX+ vs Radeon HD 4830 1GB

Intro

Compare those specifications to the Radeon HD 4830 1GB, which makes use of a 55 nm design. AMD has clocked the core speed at 575 MHz. The GDDR4 RAM runs at a speed of 900 MHz on this card. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

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

In theory, the GeForce 9800 GTX+ is 22% faster than the Radeon HD 4830 1GB in general, due to its higher bandwidth. (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%) better at anisotropic 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+ will be quite a bit (approximately 28%) more effective at AA than the Radeon HD 4830 1GB, and also able to handle higher resolutions better. (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: Memory bandwidth is the largest amount of data (in units of megabytes per second) that can be moved past the external memory interface within a second. The number is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.