GeForce GT 320 vs Radeon HD 4770

Intro

Compare those specifications to the Radeon HD 4770, which has GPU core speed of 750 MHz, and 512 MB of GDDR5 RAM set to run at 800 MHz through a 128-bit bus. It also features 640(128x5) SPUs, 32 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 320		43 Watts
Radeon HD 4770		80 Watts
	Difference: 37 Watts (86%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4770 will be 103% faster than the GeForce GT 320 in general, because of its greater data rate. (explain)

Radeon HD 4770		51200 MB/sec
GeForce GT 320		25280 MB/sec
	Difference: 25920 (103%)

Texel Rate

The Radeon HD 4770 is a lot (approximately 85%) faster with regards to texture filtering than the GeForce GT 320. (explain)

Radeon HD 4770		24000 Mtexels/sec
GeForce GT 320		12960 Mtexels/sec
	Difference: 11040 (85%)

Pixel Rate

The Radeon HD 4770 should be quite a bit (approximately 178%) more effective at FSAA than the GeForce GT 320, and able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 4770		12000 Mpixels/sec
GeForce GT 320		4320 Mpixels/sec
	Difference: 7680 (178%)

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 information (in units of megabytes per second) that can be transferred past the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, 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. Pixel rate is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.