GeForce GTX 480 vs Radeon HD 4650 512MB

Intro

Compare that to the Radeon HD 4650 512MB, which comes with a core clock speed of 600 MHz and a DDR2 memory frequency of 500 MHz. It also features a 128-bit bus, and uses a 55 nm design. It is made up of 320(64x5) SPUs, 32 Texture Address Units, and 8 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 512MB		55 Watts
GeForce GTX 480		250 Watts
	Difference: 195 Watts (355%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 480 should theoretically be quite a bit better than the Radeon HD 4650 512MB overall. (explain)

GeForce GTX 480		177408 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 161408 (1009%)

Texel Rate

The GeForce GTX 480 will be a lot (more or less 119%) better at AF than the Radeon HD 4650 512MB. (explain)

GeForce GTX 480		42000 Mtexels/sec
Radeon HD 4650 512MB		19200 Mtexels/sec
	Difference: 22800 (119%)

Pixel Rate

The GeForce GTX 480 will be a lot (more or less 600%) more effective at full screen anti-aliasing than the Radeon HD 4650 512MB, and capable of handling higher resolutions while still performing well. (explain)

GeForce GTX 480		33600 Mpixels/sec
Radeon HD 4650 512MB		4800 Mpixels/sec
	Difference: 28800 (600%)

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 data (counted in megabytes per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the bus width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 once 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, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total texture units of the card by the core 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 applied in a second.

Pixel Rate: Pixel rate is the most 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 amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few 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.