GeForce GTS 450 1GB vs Radeon HD 4750

Intro

Compare those specs to the Radeon HD 4750, which uses a 40 nm design. AMD has clocked the core speed at 730 MHz. The GDDR5 memory runs at a speed of 800 MHz on this specific card. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

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

In theory, the GeForce GTS 450 1GB will be 13% faster than the Radeon HD 4750 in general, because of its higher bandwidth. (explain)

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

Texel Rate

The GeForce GTS 450 1GB is a small bit (more or less 7%) faster with regards to anisotropic filtering 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 is a little bit (more or less 7%) faster with regards to anti-aliasing than the Radeon HD 4750, and also will be capable of handling higher screen resolutions more effectively. (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: Memory bandwidth is the max amount of information (counted in megabytes per second) that can be moved across the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range 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 figure is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the 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 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 figure is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.