GeForce GTS 450 vs Radeon HD 4750

Intro

Compare all that to the Radeon HD 4750, which features a clock speed of 730 MHz and a GDDR5 memory speed of 800 MHz. It also makes use of a 128-bit bus, and uses 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 4750		75 Watts
GeForce GTS 450		106 Watts
	Difference: 31 Watts (41%)

Memory Bandwidth

The GeForce GTS 450 should theoretically be a little bit faster than the Radeon HD 4750 overall. (explain)

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

Texel Rate

The GeForce GTS 450 is a bit (about 7%) better at texture filtering than the Radeon HD 4750. (explain)

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

Pixel Rate

If using a high resolution is important to you, then the GeForce GTS 450 is the winner, but only just. (explain)

GeForce GTS 450		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: Memory bandwidth is the largest amount of data (in units of MB per second) that can be transported across the external memory interface within a second. The number is worked out by multiplying the bus width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 again. If 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, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could 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 colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.