Geforce GTX 680 vs Radeon HD 4650 1GB

Intro

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

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB		55 Watts
Geforce GTX 680		195 Watts
	Difference: 140 Watts (255%)

Memory Bandwidth

Theoretically speaking, the Geforce GTX 680 should perform a lot faster than the Radeon HD 4650 1GB in general. (explain)

Geforce GTX 680		192256 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 169856 (758%)

Texel Rate

The Geforce GTX 680 will be quite a bit (more or less 571%) better at anisotropic filtering than the Radeon HD 4650 1GB. (explain)

Geforce GTX 680		128768 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 109568 (571%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Geforce GTX 680 is superior to the Radeon HD 4650 1GB, by far. (explain)

Geforce GTX 680		32192 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 27392 (571%)

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 (in units of megabytes per second) that can be transported over the external memory interface in one second. It's worked out by multiplying the bus width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total texture units of the card by the core speed of the chip. The better 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 most pixels that the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines 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 rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.