GeForce GTS 450 1GB vs Radeon HD 4770

Intro

Compare those specifications to the Radeon HD 4770, which has GPU clock 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) Stream Processors, 32 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
GeForce GTS 450 1GB		106 Watts
	Difference: 26 Watts (33%)

Memory Bandwidth

Performance-wise, the GeForce GTS 450 1GB should in theory be a bit better than the Radeon HD 4770 in general. (explain)

GeForce GTS 450 1GB		57728 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 6528 (13%)

Texel Rate

The GeForce GTS 450 1GB is a little bit (approximately 4%) more effective at texture filtering than the Radeon HD 4770. (explain)

GeForce GTS 450 1GB		25056 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 1056 (4%)

Pixel Rate

The GeForce GTS 450 1GB is just a bit (about 4%) better at FSAA than the Radeon HD 4770, and also will be able to handle higher screen resolutions more effectively. (explain)

GeForce GTS 450 1GB		12528 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 528 (4%)

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 transported over the external memory interface in a second. It is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total number of texture units by the core clock 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 in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.