GeForce GT 450 (OEM) vs Radeon HD 4870 1GB

Intro

Compare all of that to the Radeon HD 4870 1GB, which uses a 55 nm design. ATi has clocked the core speed at 750 MHz. The GDDR5 RAM works at a speed of 900 MHz on this specific model. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 450 (OEM)		106 Watts
Radeon HD 4870 1GB		150 Watts
	Difference: 44 Watts (42%)

Memory Bandwidth

In theory, the Radeon HD 4870 1GB is 20% quicker than the GeForce GT 450 (OEM) in general, due to its greater bandwidth. (explain)

Radeon HD 4870 1GB		115200 MB/sec
GeForce GT 450 (OEM)		96000 MB/sec
	Difference: 19200 (20%)

Texel Rate

The Radeon HD 4870 1GB should be quite a bit (about 58%) more effective at AF than the GeForce GT 450 (OEM). (explain)

Radeon HD 4870 1GB		30000 Mtexels/sec
GeForce GT 450 (OEM)		18960 Mtexels/sec
	Difference: 11040 (58%)

Pixel Rate

The GeForce GT 450 (OEM) should be much (approximately 58%) better at full screen anti-aliasing than the Radeon HD 4870 1GB, and capable of handling higher screen resolutions without losing too much performance. (explain)

GeForce GT 450 (OEM)		18960 Mpixels/sec
Radeon HD 4870 1GB		12000 Mpixels/sec
	Difference: 6960 (58%)

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 (counted in MB per second) that can be moved over the external memory interface within a second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high 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 amount of texture units 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of 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.