GeForce GTS 450 vs Radeon HD 7990

Intro

Compare all of that to the Radeon HD 7990, which comes with a core clock speed of 950 MHz and a GDDR5 memory frequency of 1500 MHz. It also uses a 384-bit bus, and makes use of a 28 nm design. It is comprised of 2048 SPUs, 128 TAUs, and 32 Raster Operation 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 7990		15520 points
GeForce GTS 450		1453 points
	Difference: 14067 (968%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTS 450		106 Watts
Radeon HD 7990		375 Watts
	Difference: 269 Watts (254%)

Memory Bandwidth

In theory, the Radeon HD 7990 should perform a lot faster than the GeForce GTS 450 in general. (explain)

Radeon HD 7990		576000 MB/sec
GeForce GTS 450		57728 MB/sec
	Difference: 518272 (898%)

Texel Rate

The Radeon HD 7990 should be much (more or less 871%) more effective at AF than the GeForce GTS 450. (explain)

Radeon HD 7990		243200 Mtexels/sec
GeForce GTS 450		25056 Mtexels/sec
	Difference: 218144 (871%)

Pixel Rate

The Radeon HD 7990 should be quite a bit (more or less 385%) faster with regards to FSAA than the GeForce GTS 450, and also should be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 7990		60800 Mpixels/sec
GeForce GTS 450		12528 Mpixels/sec
	Difference: 48272 (385%)

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 information (counted in megabytes per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the interface width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen 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 this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

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