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GeForce GTS 450 vs Radeon HD 7990

Intro

The GeForce GTS 450 makes use of a 40 nm design. nVidia has set the core frequency at 783 MHz. The GDDR5 RAM runs at a speed of 902 MHz on this card. It features 192 SPUs along with 32 Texture Address Units and 16 ROPs.

Compare that to the Radeon HD 7990, which has core clock speeds of 950 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 memory. It features 2048 SPUs along with 128 TAUs and 32 Rasterization Operator Units.

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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

Theoretically speaking, the Radeon HD 7990 should be 898% faster than the GeForce GTS 450 in general, due to its greater bandwidth. (explain)

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

Texel Rate

The Radeon HD 7990 is a lot (about 871%) faster with regards to 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 (about 385%) more effective at anti-aliasing than the GeForce GTS 450, and also will be capable of handling higher resolutions without slowing down too much. (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

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GeForce GTS 450

Amazon.com

Check prices at:

Radeon HD 7990

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce GTS 450 Radeon HD 7990
Manufacturer nVidia AMD
Year September 2010 April 2013
Code Name GF106 Malta
Memory 512 MB 3072 MB (x2)
Core Speed 783 MHz 950 MHz (x2)
Memory Speed 3608 MHz 6000 MHz (x2)
Power (Max TDP) 106 watts 375 watts
Bandwidth 57728 MB/sec 576000 MB/sec
Texel Rate 25056 Mtexels/sec 243200 Mtexels/sec
Pixel Rate 12528 Mpixels/sec 60800 Mpixels/sec
Unified Shaders 192 2048 (x2)
Texture Mapping Units 32 128 (x2)
Render Output Units 16 32 (x2)
Bus Type GDDR5 GDDR5
Bus Width 128-bit 384-bit (x2)
Fab Process 40 nm 28 nm
Transistors 1170 million 4313 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.3

Memory Bandwidth: Bandwidth is the largest amount of information (counted in MB per second) that can be moved past the external memory interface in a second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better 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 amount of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount 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 filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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GeForce GTS 450

Amazon.com

Check prices at:

Radeon HD 7990

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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