GeForce 9800 GT 1GB vs Radeon HD 4750

Intro

Compare those specs to the Radeon HD 4750, which uses a 40 nm design. AMD has clocked the core speed at 730 MHz. The GDDR5 memory works at a speed of 800 MHz on this particular card. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
GeForce 9800 GT 1GB		105 Watts
	Difference: 30 Watts (40%)

Memory Bandwidth

Theoretically speaking, the GeForce 9800 GT 1GB is 13% quicker than the Radeon HD 4750 in general, due to its higher data rate. (explain)

GeForce 9800 GT 1GB		57600 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 6400 (13%)

Texel Rate

The GeForce 9800 GT 1GB is a lot (about 44%) more effective at anisotropic filtering than the Radeon HD 4750. (explain)

GeForce 9800 GT 1GB		33600 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 10240 (44%)

Pixel Rate

The Radeon HD 4750 will be much (about 22%) more effective at FSAA than the GeForce 9800 GT 1GB, and will be able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 4750		11680 Mpixels/sec
GeForce 9800 GT 1GB		9600 Mpixels/sec
	Difference: 2080 (22%)

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 max amount of data (counted in megabytes per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.