GeForce GTS 450 1GB vs Radeon HD 4650 1GB

Intro

Compare all that to the Radeon HD 4650 1GB, which has a GPU core clock speed of 600 MHz, and 1024 MB of GDDR3 RAM set to run at 700 MHz through a 128-bit bus. It also is made up of 320(64x5) Stream Processors, 32 TAUs, and 8 Raster Operation Units.

Display Graphs

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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 theoretically perform a lot 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 is a lot (approximately 31%) faster with regards to anisotropic filtering 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

The GeForce GTS 450 1GB should be quite a bit (more or less 161%) faster with regards to AA than the Radeon HD 4650 1GB, and will be able to handle higher screen resolutions while still performing well. (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 maximum amount of information (in units of MB per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the card's interface width by its memory speed. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher 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 number of pixels the video card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.