GeForce GTS 450 1GB vs Radeon HD 4650 1GB

Intro

Compare all of that to the Radeon HD 4650 1GB, which uses a 55 nm design. AMD has set the core frequency at 600 MHz. The GDDR3 RAM works at a speed of 700 MHz on this model. It features 320(64x5) SPUs as well as 32 TAUs and 8 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB		55 Watts
GeForce GTS 450 1GB		106 Watts
	Difference: 51 Watts (93%)

Memory Bandwidth

The GeForce GTS 450 1GB should in theory be quite a bit faster than the Radeon HD 4650 1GB in general. (explain)

GeForce GTS 450 1GB		57728 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 35328 (158%)

Texel Rate

The GeForce GTS 450 1GB should be a lot (approximately 31%) more effective at AF than the Radeon HD 4650 1GB. (explain)

GeForce GTS 450 1GB		25056 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 5856 (31%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTS 450 1GB is the winner, and very much so. (explain)

GeForce GTS 450 1GB		12528 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 7728 (161%)

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 largest amount of information (counted in MB per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better 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 amount of texture map elements (texels) that are processed per second. This number is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one 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. The number is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.