GeForce GT 340 vs Radeon HD 4650 1GB

Intro

Compare all of that to the Radeon HD 4650 1GB, which uses a 55 nm design. AMD has clocked the core speed at 600 MHz. The GDDR3 RAM works at a frequency of 700 MHz on this particular card. It features 320(64x5) SPUs along with 32 TAUs and 8 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB		55 Watts
GeForce GT 340		69 Watts
	Difference: 14 Watts (25%)

Memory Bandwidth

Theoretically speaking, the GeForce GT 340 should be a lot faster than the Radeon HD 4650 1GB overall. (explain)

GeForce GT 340		54400 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 32000 (143%)

Texel Rate

The Radeon HD 4650 1GB will be a little bit (about 9%) more effective at anisotropic filtering than the GeForce GT 340. (explain)

Radeon HD 4650 1GB		19200 Mtexels/sec
GeForce GT 340		17600 Mtexels/sec
	Difference: 1600 (9%)

Pixel Rate

The Radeon HD 4650 1GB should be just a bit (approximately 9%) better at AA than the GeForce GT 340, and should be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 4650 1GB		4800 Mpixels/sec
GeForce GT 340		4400 Mpixels/sec
	Difference: 400 (9%)

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 information (in units of MB per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the bus width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. 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 lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.