GeForce GTS 450 1GB vs Radeon HD 5770

Intro

Compare that to the Radeon HD 5770, which features a core clock speed of 850 MHz and a GDDR5 memory speed of 1200 MHz. It also uses a 128-bit memory bus, and uses a 40 nm design. It is comprised of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTS 450 1GB		106 Watts
Radeon HD 5770		108 Watts
	Difference: 2 Watts (2%)

Memory Bandwidth

In theory, the Radeon HD 5770 should be a lot faster than the GeForce GTS 450 1GB overall. (explain)

Radeon HD 5770		76800 MB/sec
GeForce GTS 450 1GB		57728 MB/sec
	Difference: 19072 (33%)

Texel Rate

The Radeon HD 5770 is a lot (about 36%) better at texture filtering than the GeForce GTS 450 1GB. (explain)

Radeon HD 5770		34000 Mtexels/sec
GeForce GTS 450 1GB		25056 Mtexels/sec
	Difference: 8944 (36%)

Pixel Rate

The Radeon HD 5770 will be a small bit (about 9%) more effective at full screen anti-aliasing than the GeForce GTS 450 1GB, and will be able to handle higher screen resolutions better. (explain)

Radeon HD 5770		13600 Mpixels/sec
GeForce GTS 450 1GB		12528 Mpixels/sec
	Difference: 1072 (9%)

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 max amount of data (counted in MB per second) that can be transferred past the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR 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 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 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 that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.