GeForce GTX 650 vs Radeon HD 4830 512MB

Intro

Compare those specs to the Radeon HD 4830 512MB, which features a core clock speed of 575 MHz and a GDDR3 memory frequency of 900 MHz. It also makes use of a 256-bit bus, and makes use of a 55 nm design. It is comprised of 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
Radeon HD 4830 512MB		95 Watts
	Difference: 31 Watts (48%)

Memory Bandwidth

The GeForce GTX 650, in theory, should be a lot faster than the Radeon HD 4830 512MB overall. (explain)

GeForce GTX 650		80000 MB/sec
Radeon HD 4830 512MB		57600 MB/sec
	Difference: 22400 (39%)

Texel Rate

The GeForce GTX 650 will be quite a bit (more or less 84%) faster with regards to texture filtering than the Radeon HD 4830 512MB. (explain)

GeForce GTX 650		33856 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 15456 (84%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTX 650 is superior to the Radeon HD 4830 512MB, and very much so. (explain)

GeForce GTX 650		16928 Mpixels/sec
Radeon HD 4830 512MB		9200 Mpixels/sec
	Difference: 7728 (84%)

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 (measured in MB per second) that can be transferred over the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. 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 texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the video 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 the video card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated 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 filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.