GeForce GTX 650 vs Radeon HD 4650 1GB

Intro

Compare those specifications to the Radeon HD 4650 1GB, which uses a 55 nm design. AMD has set the core speed at 600 MHz. The GDDR3 RAM works at a frequency of 700 MHz on this specific model. It features 320(64x5) SPUs along with 32 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB		55 Watts
GeForce GTX 650		64 Watts
	Difference: 9 Watts (16%)

Memory Bandwidth

The GeForce GTX 650 should theoretically perform a lot faster than the Radeon HD 4650 1GB overall. (explain)

GeForce GTX 650		80000 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 57600 (257%)

Texel Rate

The GeForce GTX 650 should be much (about 76%) faster with regards to texture filtering than the Radeon HD 4650 1GB. (explain)

GeForce GTX 650		33856 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 14656 (76%)

Pixel Rate

The GeForce GTX 650 is a lot (approximately 253%) more effective at FSAA than the Radeon HD 4650 1GB, and will be capable of handling higher screen resolutions without slowing down too much. (explain)

GeForce GTX 650		16928 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 12128 (253%)

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 megabytes per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster 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 number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called 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, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.