GeForce GTS 450 vs Radeon HD 4770

Intro

Compare those specifications to the Radeon HD 4770, which comes with a clock frequency of 750 MHz and a GDDR5 memory speed of 800 MHz. It also makes use of a 128-bit bus, and makes use of a 40 nm design. It is made up of 640(128x5) SPUs, 32 TAUs, 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		106 Watts
	Difference: 26 Watts (33%)

Memory Bandwidth

Theoretically speaking, the GeForce GTS 450 should perform just a bit faster than the Radeon HD 4770 in general. (explain)

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

Texel Rate

The GeForce GTS 450 is a small bit (about 4%) better at texture filtering than the Radeon HD 4770. (explain)

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

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTS 450 is the winner, but it probably won't make a huge difference. (explain)

GeForce GTS 450		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: Bandwidth is the maximum amount of data (in units of megabytes per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.