GeForce GT 340 1GB vs Radeon HD 4850 1GB

Intro

Compare those specifications to the Radeon HD 4850 1GB, which features core clock speeds of 625 MHz on the GPU, and 993 MHz on the 1024 MB of GDDR4 memory. It features 800(160x5) SPUs as well as 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340 1GB		69 Watts
Radeon HD 4850 1GB		110 Watts
	Difference: 41 Watts (59%)

Memory Bandwidth

In theory, the Radeon HD 4850 1GB is 17% faster than the GeForce GT 340 1GB in general, because of its higher bandwidth. (explain)

Radeon HD 4850 1GB		63552 MB/sec
GeForce GT 340 1GB		54400 MB/sec
	Difference: 9152 (17%)

Texel Rate

The Radeon HD 4850 1GB is quite a bit (approximately 42%) faster with regards to AF than the GeForce GT 340 1GB. (explain)

Radeon HD 4850 1GB		25000 Mtexels/sec
GeForce GT 340 1GB		17600 Mtexels/sec
	Difference: 7400 (42%)

Pixel Rate

The Radeon HD 4850 1GB should be much (approximately 127%) faster with regards to AA than the GeForce GT 340 1GB, and should be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 4850 1GB		10000 Mpixels/sec
GeForce GT 340 1GB		4400 Mpixels/sec
	Difference: 5600 (127%)

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 data (in units of MB per second) that can be transported over the external memory interface in one second. It's worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better 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 number of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the clock 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 fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.