GeForce GT 320 vs Radeon HD 4650 512MB

Intro

Compare those specs to the Radeon HD 4650 512MB, which features GPU clock speed of 600 MHz, and 512 MB of DDR2 RAM set to run at 500 MHz through a 128-bit bus. It also is made up of 320(64x5) Stream Processors, 32 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 320		43 Watts
Radeon HD 4650 512MB		55 Watts
	Difference: 12 Watts (28%)

Memory Bandwidth

Theoretically speaking, the GeForce GT 320 should be 58% faster than the Radeon HD 4650 512MB in general, due to its higher data rate. (explain)

GeForce GT 320		25280 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 9280 (58%)

Texel Rate

The Radeon HD 4650 512MB is much (more or less 48%) better at AF than the GeForce GT 320. (explain)

Radeon HD 4650 512MB		19200 Mtexels/sec
GeForce GT 320		12960 Mtexels/sec
	Difference: 6240 (48%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 4650 512MB is the winner, but only just. (explain)

Radeon HD 4650 512MB		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: Bandwidth is the largest amount of data (in units of megabytes per second) that can be transported across the external memory interface within a second. The number is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.