GeForce GTS 450 1GB vs Radeon HD 4750

Intro

Compare those specs to the Radeon HD 4750, which comes with a core clock frequency of 730 MHz and a GDDR5 memory speed of 800 MHz. It also makes use of a 128-bit memory bus, and makes use of a 40 nm design. It is comprised of 640(128x5) SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
GeForce GTS 450 1GB		106 Watts
	Difference: 31 Watts (41%)

Memory Bandwidth

The GeForce GTS 450 1GB, in theory, should be a small bit faster than the Radeon HD 4750 in general. (explain)

GeForce GTS 450 1GB		57728 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 6528 (13%)

Texel Rate

The GeForce GTS 450 1GB should be a little bit (more or less 7%) better at AF than the Radeon HD 4750. (explain)

GeForce GTS 450 1GB		25056 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 1696 (7%)

Pixel Rate

The GeForce GTS 450 1GB should be just a bit (about 7%) better at full screen anti-aliasing than the Radeon HD 4750, and also able to handle higher screen resolutions better. (explain)

GeForce GTS 450 1GB		12528 Mpixels/sec
Radeon HD 4750		11680 Mpixels/sec
	Difference: 848 (7%)

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 information (counted in megabytes per second) that can be transferred past the external memory interface in one second. It is worked out by multiplying the interface width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR 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 calculated by multiplying the total amount of texture units of the card by the core 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 a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the 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 card's 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 output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.