Compare those specifications to the Radeon HD 5570, which features a core clock frequency of 650 MHz and a DDR3 memory speed of 900 MHz. It also uses a 128-bit bus, and makes use of a 40 nm design. It is comprised of 400(80x5) SPUs, 20 Texture Address Units, and 8 ROPs.

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5570		43 Watts
GeForce GT 430 1GB		60 Watts
	Difference: 17 Watts (40%)

Memory Bandwidth

Both cards have exactly the same bandwidth, so in theory they should perform exactly the same. (explain)

Texel Rate

The Radeon HD 5570 should be a small bit (about 16%) better at texture filtering than the GeForce GT 430 1GB. (explain)

Radeon HD 5570		13000 Mtexels/sec
GeForce GT 430 1GB		11200 Mtexels/sec
	Difference: 1800 (16%)

Pixel Rate

The Radeon HD 5570 will be much (approximately 86%) better at anti-aliasing than the GeForce GT 430 1GB, and also will be able to handle higher resolutions better. (explain)

Radeon HD 5570		5200 Mpixels/sec
GeForce GT 430 1GB		2800 Mpixels/sec
	Difference: 2400 (86%)

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.