GeForce 8300 GS (OEM) vs Radeon HD 7990

Intro

Compare all that to the Radeon HD 7990, which has a clock speed of 950 MHz and a GDDR5 memory frequency of 1500 MHz. It also uses a 384-bit memory bus, and uses a 28 nm design. It features 2048 SPUs, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8300 GS (OEM)		40 Watts
Radeon HD 7990		375 Watts
	Difference: 335 Watts (838%)

Memory Bandwidth

The Radeon HD 7990 should theoretically be a lot faster than the GeForce 8300 GS (OEM) overall. (explain)

Radeon HD 7990		576000 MB/sec
GeForce 8300 GS (OEM)		6400 MB/sec
	Difference: 569600 (8900%)

Texel Rate

The Radeon HD 7990 should be a lot (more or less 13411%) faster with regards to anisotropic filtering than the GeForce 8300 GS (OEM). (explain)

Radeon HD 7990		243200 Mtexels/sec
GeForce 8300 GS (OEM)		1800 Mtexels/sec
	Difference: 241400 (13411%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7990 is a better choice, by a large margin. (explain)

Radeon HD 7990		60800 Mpixels/sec
GeForce 8300 GS (OEM)		900 Mpixels/sec
	Difference: 59900 (6656%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of data (measured in megabytes per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the interface width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. 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 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 speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.