GeForce GT 340 1GB vs Radeon HD 4650 512MB

Intro

Compare that to the Radeon HD 4650 512MB, which makes use of a 55 nm design. AMD has set the core speed at 600 MHz. The DDR2 RAM is set to run at a speed of 500 MHz on this specific card. It features 320(64x5) SPUs along with 32 TAUs and 8 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 512MB		55 Watts
GeForce GT 340 1GB		69 Watts
	Difference: 14 Watts (25%)

Memory Bandwidth

The GeForce GT 340 1GB should in theory be a lot faster than the Radeon HD 4650 512MB overall. (explain)

GeForce GT 340 1GB		54400 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 38400 (240%)

Texel Rate

The Radeon HD 4650 512MB will be just a bit (about 9%) faster with regards to AF than the GeForce GT 340 1GB. (explain)

Radeon HD 4650 512MB		19200 Mtexels/sec
GeForce GT 340 1GB		17600 Mtexels/sec
	Difference: 1600 (9%)

Pixel Rate

The Radeon HD 4650 512MB should be just a bit (approximately 9%) more effective at full screen anti-aliasing than the GeForce GT 340 1GB, and also able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 4650 512MB		4800 Mpixels/sec
GeForce GT 340 1GB		4400 Mpixels/sec
	Difference: 400 (9%)

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 (measured in MB per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the interface width by its memory speed. If the card has DDR memory, it 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, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.