GeForce GT 340 vs Radeon HD 4890 2GB

Intro

Compare those specifications to the Radeon HD 4890 2GB, which uses a 55 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 RAM is set to run at a frequency of 975 MHz on this particular card. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340		69 Watts
Radeon HD 4890 2GB		190 Watts
	Difference: 121 Watts (175%)

Memory Bandwidth

Performance-wise, the Radeon HD 4890 2GB should in theory be quite a bit better than the GeForce GT 340 overall. (explain)

Radeon HD 4890 2GB		124800 MB/sec
GeForce GT 340		54400 MB/sec
	Difference: 70400 (129%)

Texel Rate

The Radeon HD 4890 2GB is a lot (about 127%) more effective at texture filtering than the GeForce GT 340. (explain)

Radeon HD 4890 2GB		40000 Mtexels/sec
GeForce GT 340		17600 Mtexels/sec
	Difference: 22400 (127%)

Pixel Rate

The Radeon HD 4890 2GB is much (about 264%) faster with regards to full screen anti-aliasing than the GeForce GT 340, and also capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 4890 2GB		16000 Mpixels/sec
GeForce GT 340		4400 Mpixels/sec
	Difference: 11600 (264%)

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 information (in units of MB per second) that can be transported past the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core 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 rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.