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GeForce GTX 880M vs Radeon HD 4850 X2 512MB

Intro

The GeForce GTX 880M features a clock frequency of 954 MHz and a GDDR5 memory speed of 1000 MHz. It also features a 256-bit memory bus, and makes use of a 28 nm design. It features 1536 SPUs, 128 TAUs, and 32 Raster Operation Units.

Compare all that to the Radeon HD 4850 X2 512MB, which features a GPU core clock speed of 625 MHz, and 512 MB of GDDR3 memory running at 993 MHz through a 256-bit bus. It also is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 880M 130 Watts
Radeon HD 4850 X2 512MB 250 Watts
Difference: 120 Watts (92%)

Memory Bandwidth

The GeForce GTX 880M should in theory perform a bit faster than the Radeon HD 4850 X2 512MB overall. (explain)

GeForce GTX 880M 128000 MB/sec
Radeon HD 4850 X2 512MB 127104 MB/sec
Difference: 896 (1%)

Texel Rate

The GeForce GTX 880M will be a lot (about 144%) more effective at AF than the Radeon HD 4850 X2 512MB. (explain)

GeForce GTX 880M 122112 Mtexels/sec
Radeon HD 4850 X2 512MB 50000 Mtexels/sec
Difference: 72112 (144%)

Pixel Rate

The GeForce GTX 880M should be much (more or less 53%) better at full screen anti-aliasing than the Radeon HD 4850 X2 512MB, and also will be able to handle higher screen resolutions without losing too much performance. (explain)

GeForce GTX 880M 30528 Mpixels/sec
Radeon HD 4850 X2 512MB 20000 Mpixels/sec
Difference: 10528 (53%)

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 880M

Amazon.com

Check prices at:

Radeon HD 4850 X2 512MB

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 880M Radeon HD 4850 X2 512MB
Manufacturer nVidia AMD
Year March 12 2014 Nov 7, 2008
Code Name GK104 R700
Memory 4096 MB 512 MB (x2)
Core Speed 954 MHz 625 MHz (x2)
Memory Speed 4000 MHz 1986 MHz (x2)
Power (Max TDP) 130 watts 250 watts
Bandwidth 128000 MB/sec 127104 MB/sec
Texel Rate 122112 Mtexels/sec 50000 Mtexels/sec
Pixel Rate 30528 Mpixels/sec 20000 Mpixels/sec
Unified Shaders 1536 800(160x5) (x2)
Texture Mapping Units 128 40 (x2)
Render Output Units 32 16 (x2)
Bus Type GDDR5 GDDR3
Bus Width 256-bit 256-bit (x2)
Fab Process 28 nm 55 nm
Transistors (Unknown) million 956 million
Bus PCIe 3.0 x16 PCIe 2.0 x16 (PCIe bridge)
DirectX Version DirectX 12 DirectX 10.1
OpenGL Version OpenGL 4.5 OpenGL 3.0

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be transferred over the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better 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 texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total texture units by the core speed of the chip. The better this number, 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 can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated 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 rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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GeForce GTX 880M

Amazon.com

Check prices at:

Radeon HD 4850 X2 512MB

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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