GeForce GT 450 (OEM) vs Radeon HD 4770

Intro

Compare that to the Radeon HD 4770, which comes with a clock frequency of 750 MHz and a GDDR5 memory speed of 800 MHz. It also features a 128-bit bus, and uses a 40 nm design. It is comprised of 640(128x5) SPUs, 32 TAUs, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
GeForce GT 450 (OEM)		106 Watts
	Difference: 26 Watts (33%)

Memory Bandwidth

In theory, the GeForce GT 450 (OEM) should perform a lot faster than the Radeon HD 4770 in general. (explain)

GeForce GT 450 (OEM)		96000 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 44800 (88%)

Texel Rate

The Radeon HD 4770 should be quite a bit (approximately 27%) more effective at AF than the GeForce GT 450 (OEM). (explain)

Radeon HD 4770		24000 Mtexels/sec
GeForce GT 450 (OEM)		18960 Mtexels/sec
	Difference: 5040 (27%)

Pixel Rate

The GeForce GT 450 (OEM) will be much (more or less 58%) faster with regards to FSAA than the Radeon HD 4770, and also should be able to handle higher screen resolutions better. (explain)

GeForce GT 450 (OEM)		18960 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 6960 (58%)

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 maximum amount of information (measured in megabytes per second) that can be transferred across the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 applied in one second. This figure is calculated by multiplying the total number of texture units of the card 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 the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. 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 reach the maximum fill rate.