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GeForce GTX 660 Ti vs Radeon HD 4850 X2 1GB

Intro

The GeForce GTX 660 Ti comes with core clock speeds of 915 MHz on the GPU, and 1500 MHz on the 2048 MB of GDDR5 memory. It features 1344 SPUs along with 112 Texture Address Units and 24 ROPs.

Compare those specifications to the Radeon HD 4850 X2 1GB, which has a GPU core clock speed of 625 MHz, and 1024 MB of GDDR3 RAM running at 993 MHz through a 256-bit bus. It also is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 Ti 150 Watts
Radeon HD 4850 X2 1GB 250 Watts
Difference: 100 Watts (67%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 660 Ti should in theory be just a bit superior to the Radeon HD 4850 X2 1GB overall. (explain)

GeForce GTX 660 Ti 144000 MB/sec
Radeon HD 4850 X2 1GB 127104 MB/sec
Difference: 16896 (13%)

Texel Rate

The GeForce GTX 660 Ti is much (about 105%) better at AF than the Radeon HD 4850 X2 1GB. (explain)

GeForce GTX 660 Ti 102480 Mtexels/sec
Radeon HD 4850 X2 1GB 50000 Mtexels/sec
Difference: 52480 (105%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTX 660 Ti is a better choice, not by a very large margin though. (explain)

GeForce GTX 660 Ti 21960 Mpixels/sec
Radeon HD 4850 X2 1GB 20000 Mpixels/sec
Difference: 1960 (10%)

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 GTX 660 Ti

Amazon.com

Check prices at:

Radeon HD 4850 X2 1GB

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 GTX 660 Ti Radeon HD 4850 X2 1GB
Manufacturer nVidia AMD
Year August 2012 Nov 7, 2008
Code Name GK104 R700
Memory 2048 MB 1024 MB (x2)
Core Speed 915 MHz 625 MHz (x2)
Memory Speed 6000 MHz 1986 MHz (x2)
Power (Max TDP) 150 watts 250 watts
Bandwidth 144000 MB/sec 127104 MB/sec
Texel Rate 102480 Mtexels/sec 50000 Mtexels/sec
Pixel Rate 21960 Mpixels/sec 20000 Mpixels/sec
Unified Shaders 1344 800(160x5) (x2)
Texture Mapping Units 112 40 (x2)
Render Output Units 24 16 (x2)
Bus Type GDDR5 GDDR3
Bus Width 192-bit 256-bit (x2)
Fab Process 28 nm 55 nm
Transistors 3540 million 956 million
Bus PCIe 3.0 x16 PCIe 2.0 x16 (PCIe bridge)
DirectX Version DirectX 11.0 DirectX 10.1
OpenGL Version OpenGL 4.3 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be transferred past the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the clock 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 fill rate is also dependant on lots of 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

Hide Prices

GeForce GTX 660 Ti

Amazon.com

Check prices at:

Radeon HD 4850 X2 1GB

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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