GeForce GTS 450 1GB vs Radeon HD 4650 1GB

Intro

Compare those specs to the Radeon HD 4650 1GB, which features a clock speed of 600 MHz and a GDDR3 memory frequency of 700 MHz. It also makes use of a 128-bit memory bus, and uses a 55 nm design. It is made up of 320(64x5) SPUs, 32 Texture Address Units, 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

In theory, the GeForce GTS 450 1GB should be 158% quicker than the Radeon HD 4650 1GB overall, because of its greater data rate. (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 (more or less 31%) better 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

The GeForce GTS 450 1GB will be quite a bit (about 161%) faster with regards to FSAA than the Radeon HD 4650 1GB, and also will be able to handle higher screen resolutions more effectively. (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: Memory bandwidth is the max amount of data (counted in MB per second) that can be moved across the external memory interface in a second. It's calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the card's 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 also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.