GeForce GTX 465 vs Radeon HD 4650 512MB

Intro

Compare all that to the Radeon HD 4650 512MB, which has a core clock speed of 600 MHz and a DDR2 memory frequency of 500 MHz. It also makes use of a 128-bit memory bus, and uses a 55 nm design. It features 320(64x5) SPUs, 32 TAUs, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 512MB		55 Watts
GeForce GTX 465		200 Watts
	Difference: 145 Watts (264%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 465 will be 541% faster than the Radeon HD 4650 512MB in general, because of its greater bandwidth. (explain)

GeForce GTX 465		102592 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 86592 (541%)

Texel Rate

The GeForce GTX 465 should be quite a bit (approximately 39%) better at AF than the Radeon HD 4650 512MB. (explain)

GeForce GTX 465		26708 Mtexels/sec
Radeon HD 4650 512MB		19200 Mtexels/sec
	Difference: 7508 (39%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX 465 is superior to the Radeon HD 4650 512MB, by a large margin. (explain)

GeForce GTX 465		19424 Mpixels/sec
Radeon HD 4650 512MB		4800 Mpixels/sec
	Difference: 14624 (305%)

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 max amount of information (measured in megabytes per second) that can be transferred over the external memory interface within a second. The number is worked out by multiplying the bus width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better 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 number of texture map elements (texels) that can be processed per second. This is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines 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 output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.