Geforce GTX 680 vs Radeon HD 4650 1GB

Intro

Compare those specifications to the Radeon HD 4650 1GB, which uses a 55 nm design. AMD has clocked the core frequency at 600 MHz. The GDDR3 memory works at a speed of 700 MHz on this card. It features 320(64x5) SPUs as well as 32 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB		55 Watts
Geforce GTX 680		195 Watts
	Difference: 140 Watts (255%)

Memory Bandwidth

The Geforce GTX 680 should theoretically perform quite a bit faster than the Radeon HD 4650 1GB overall. (explain)

Geforce GTX 680		192256 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 169856 (758%)

Texel Rate

The Geforce GTX 680 should be a lot (about 571%) more effective at AF than the Radeon HD 4650 1GB. (explain)

Geforce GTX 680		128768 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 109568 (571%)

Pixel Rate

The Geforce GTX 680 is much (more or less 571%) better at AA than the Radeon HD 4650 1GB, and also should be able to handle higher resolutions better. (explain)

Geforce GTX 680		32192 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 27392 (571%)

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 maximum amount of data (in units of megabytes per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This is worked out 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 processed in a second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.