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GeForce GTS 250 1GB vs Radeon HD 6990

Intro

The GeForce GTS 250 1GB has a clock speed of 738 MHz and a GDDR3 memory frequency of 1100 MHz. It also features a 256-bit bus, and uses a 65/55 nm design. It is made up of 128 SPUs, 64 TAUs, and 16 Raster Operation Units.

Compare those specs to the Radeon HD 6990, which has a core clock speed of 830 MHz and a GDDR5 memory frequency of 1250 MHz. It also uses a 256-bit memory bus, and uses a 40 nm design. It features 1536 SPUs, 96 Texture Address Units, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTS 250 1GB 145 Watts
Radeon HD 6990 375 Watts
Difference: 230 Watts (159%)

Memory Bandwidth

In theory, the Radeon HD 6990 will be 355% quicker than the GeForce GTS 250 1GB overall, because of its higher bandwidth. (explain)

Radeon HD 6990 320000 MB/sec
GeForce GTS 250 1GB 70400 MB/sec
Difference: 249600 (355%)

Texel Rate

The Radeon HD 6990 should be quite a bit (about 237%) more effective at AF than the GeForce GTS 250 1GB. (explain)

Radeon HD 6990 159360 Mtexels/sec
GeForce GTS 250 1GB 47232 Mtexels/sec
Difference: 112128 (237%)

Pixel Rate

The Radeon HD 6990 should be quite a bit (approximately 350%) more effective at anti-aliasing than the GeForce GTS 250 1GB, and also should be able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 6990 53120 Mpixels/sec
GeForce GTS 250 1GB 11808 Mpixels/sec
Difference: 41312 (350%)

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 250 1GB

Amazon.com

Check prices at:

Radeon HD 6990

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 250 1GB Radeon HD 6990
Manufacturer nVidia AMD
Year March 3, 2009 March 2011
Code Name G92a/b Antilles
Memory 1024 MB 2048 MB (x2)
Core Speed 738 MHz 830 MHz (x2)
Memory Speed 2200 MHz 5000 MHz (x2)
Power (Max TDP) 145 watts 375 watts
Bandwidth 70400 MB/sec 320000 MB/sec
Texel Rate 47232 Mtexels/sec 159360 Mtexels/sec
Pixel Rate 11808 Mpixels/sec 53120 Mpixels/sec
Unified Shaders 128 1536 (x2)
Texture Mapping Units 64 96 (x2)
Render Output Units 16 32 (x2)
Bus Type GDDR3 GDDR5
Bus Width 256-bit 256-bit (x2)
Fab Process 65/55 nm 40 nm
Transistors 754 million 2640 million
Bus PCIe x16 2.0 PCIe 2.1 x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.1 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be transferred over the external memory interface within a second. It is calculated by multiplying the interface width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster 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 are applied in one second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

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

Display Prices

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GeForce GTS 250 1GB

Amazon.com

Check prices at:

Radeon HD 6990

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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