GeForce GTS 450 vs Radeon HD 4770

Intro

Compare all of that to the Radeon HD 4770, which features a clock frequency of 750 MHz and a GDDR5 memory speed of 800 MHz. It also uses a 128-bit bus, and makes use of a 40 nm design. It is comprised of 640(128x5) SPUs, 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		106 Watts
	Difference: 26 Watts (33%)

Memory Bandwidth

Performance-wise, the GeForce GTS 450 should theoretically be a small bit better 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 little bit (approximately 4%) faster with regards to anisotropic filtering than the Radeon HD 4770. (explain)

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

Pixel Rate

The GeForce GTS 450 should be a little bit (approximately 4%) more effective at full screen anti-aliasing than the Radeon HD 4770, and also will be capable of handling higher screen resolutions without losing too much performance. (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 MB per second) that can be transported over the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.