Radeon HD 6450 (OEM) vs Radeon HD 6790

Intro

Compare all of that to the Radeon HD 6790, which uses a 40 nm design. AMD has clocked the core frequency at 840 MHz. The GDDR5 RAM is set to run at a frequency of 1050 MHz on this specific card. It features 800 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 6790		2150 points
Radeon HD 6450 (OEM)		340 points
	Difference: 1810 (532%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM)		31 Watts
Radeon HD 6790		150 Watts
	Difference: 119 Watts (384%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6790 will be 950% quicker than the Radeon HD 6450 (OEM) overall, due to its higher bandwidth. (explain)

Radeon HD 6790		134400 MB/sec
Radeon HD 6450 (OEM)		12800 MB/sec
	Difference: 121600 (950%)

Texel Rate

The Radeon HD 6790 is much (about 572%) faster with regards to texture filtering than the Radeon HD 6450 (OEM). (explain)

Radeon HD 6790		33600 Mtexels/sec
Radeon HD 6450 (OEM)		5000 Mtexels/sec
	Difference: 28600 (572%)

Pixel Rate

The Radeon HD 6790 should be much (about 438%) more effective at FSAA than the Radeon HD 6450 (OEM), and also capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 6790		13440 Mpixels/sec
Radeon HD 6450 (OEM)		2500 Mpixels/sec
	Difference: 10940 (438%)

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 past the external memory interface in one second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 amount of texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated 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 drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.