GeForce 820M vs Radeon HD 7950

Intro

Compare those specifications to the Radeon HD 7950, which makes use of a 28 nm design. AMD has set the core frequency at 800 MHz. The GDDR5 memory is set to run at a speed of 1250 MHz on this specific card. It features 1792 SPUs along with 112 TAUs and 32 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 7950		7731 points
GeForce 820M		850 points
	Difference: 6881 (810%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M		15 Watts
Radeon HD 7950		200 Watts
	Difference: 185 Watts (1233%)

Memory Bandwidth

Performance-wise, the Radeon HD 7950 should in theory be much superior to the GeForce 820M in general. (explain)

Radeon HD 7950		240000 MB/sec
GeForce 820M		16000 MB/sec
	Difference: 224000 (1400%)

Texel Rate

The Radeon HD 7950 will be a lot (more or less 679%) faster with regards to texture filtering than the GeForce 820M. (explain)

Radeon HD 7950		89600 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 78096 (679%)

Pixel Rate

The Radeon HD 7950 is quite a bit (more or less 790%) faster with regards to full screen anti-aliasing than the GeForce 820M, and also will be able to handle higher screen resolutions better. (explain)

Radeon HD 7950		25600 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 22724 (790%)

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 max amount of data (measured in megabytes per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.