GeForce GT 320 vs Radeon HD 4650 1GB

Intro

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

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 320		43 Watts
Radeon HD 4650 1GB		55 Watts
	Difference: 12 Watts (28%)

Memory Bandwidth

In theory, the GeForce GT 320 will be 13% quicker than the Radeon HD 4650 1GB in general, because of its higher bandwidth. (explain)

GeForce GT 320		25280 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 2880 (13%)

Texel Rate

The Radeon HD 4650 1GB should be quite a bit (more or less 48%) faster with regards to AF than the GeForce GT 320. (explain)

Radeon HD 4650 1GB		19200 Mtexels/sec
GeForce GT 320		12960 Mtexels/sec
	Difference: 6240 (48%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 4650 1GB is superior to the GeForce GT 320, but only just. (explain)

Radeon HD 4650 1GB		4800 Mpixels/sec
GeForce GT 320		4320 Mpixels/sec
	Difference: 480 (11%)

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 (counted in megabytes per second) that can be moved past the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory speed. If the card has DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the graphics 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 most pixels the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines 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 fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.