GeForce GTX 650 vs Radeon HD 4550 512MB

Intro

Compare those specs to the Radeon HD 4550 512MB, which has a core clock speed of 600 MHz and a GDDR3 memory frequency of 800 MHz. It also uses a 64-bit bus, and uses a 55 nm design. It is comprised of 80(16x5) SPUs, 8 TAUs, and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4550 512MB		25 Watts
GeForce GTX 650		64 Watts
	Difference: 39 Watts (156%)

Memory Bandwidth

The GeForce GTX 650 should in theory be quite a bit faster than the Radeon HD 4550 512MB in general. (explain)

GeForce GTX 650		80000 MB/sec
Radeon HD 4550 512MB		12800 MB/sec
	Difference: 67200 (525%)

Texel Rate

The GeForce GTX 650 will be much (approximately 605%) more effective at AF than the Radeon HD 4550 512MB. (explain)

GeForce GTX 650		33856 Mtexels/sec
Radeon HD 4550 512MB		4800 Mtexels/sec
	Difference: 29056 (605%)

Pixel Rate

The GeForce GTX 650 should be quite a bit (approximately 605%) more effective at full screen anti-aliasing than the Radeon HD 4550 512MB, and able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 650		16928 Mpixels/sec
Radeon HD 4550 512MB		2400 Mpixels/sec
	Difference: 14528 (605%)

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 within a second. It's calculated by multiplying the interface width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.