GeForce GTX 660 vs Radeon HD 4650 512MB

Intro

Compare all that to the Radeon HD 4650 512MB, which features a core clock frequency of 600 MHz and a DDR2 memory speed of 500 MHz. It also uses a 128-bit bus, and makes use of a 55 nm design. It is made up of 320(64x5) SPUs, 32 Texture Address Units, and 8 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 512MB		55 Watts
GeForce GTX 660		140 Watts
	Difference: 85 Watts (155%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 660 should perform much faster than the Radeon HD 4650 512MB in general. (explain)

GeForce GTX 660		144192 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 128192 (801%)

Texel Rate

The GeForce GTX 660 will be much (about 308%) faster with regards to AF than the Radeon HD 4650 512MB. (explain)

GeForce GTX 660		78400 Mtexels/sec
Radeon HD 4650 512MB		19200 Mtexels/sec
	Difference: 59200 (308%)

Pixel Rate

The GeForce GTX 660 is a lot (about 390%) better at anti-aliasing than the Radeon HD 4650 512MB, and also should be capable of handling higher resolutions while still performing well. (explain)

GeForce GTX 660		23520 Mpixels/sec
Radeon HD 4650 512MB		4800 Mpixels/sec
	Difference: 18720 (390%)

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 largest amount of data (in units of MB per second) that can be transported past the external memory interface in one second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed 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 higher this number, 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 that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.