GeForce GT 340 vs Radeon HD 4750

Intro

Compare all that to the Radeon HD 4750, which uses a 40 nm design. AMD has set the core frequency at 730 MHz. The GDDR5 RAM is set to run at a speed of 800 MHz on this card. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340		69 Watts
Radeon HD 4750		75 Watts
	Difference: 6 Watts (9%)

Memory Bandwidth

Theoretically speaking, the GeForce GT 340 will be 6% quicker than the Radeon HD 4750 in general, because of its greater data rate. (explain)

GeForce GT 340		54400 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 3200 (6%)

Texel Rate

The Radeon HD 4750 should be much (more or less 33%) faster with regards to anisotropic filtering than the GeForce GT 340. (explain)

Radeon HD 4750		23360 Mtexels/sec
GeForce GT 340		17600 Mtexels/sec
	Difference: 5760 (33%)

Pixel Rate

The Radeon HD 4750 is quite a bit (about 165%) faster with regards to AA than the GeForce GT 340, and also should be capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 4750		11680 Mpixels/sec
GeForce GT 340		4400 Mpixels/sec
	Difference: 7280 (165%)

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 (counted in MB per second) that can be transferred over the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the 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 video card can possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.