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GeForce GTX 650 Ti vs Radeon HD 6870

Intro

The GeForce GTX 650 Ti features a GPU clock speed of 928 MHz, and the 1024 MB of GDDR5 memory runs at 1350 MHz through a 128-bit bus. It also is comprised of 768 SPUs, 64 Texture Address Units, and 16 ROPs.

Compare all that to the Radeon HD 6870, which features core clock speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 1120 SPUs along with 56 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 Ti 110 Watts
Radeon HD 6870 151 Watts
Difference: 41 Watts (37%)

Memory Bandwidth

The Radeon HD 6870, in theory, should perform a lot faster than the GeForce GTX 650 Ti in general. (explain)

Radeon HD 6870 134400 MB/sec
GeForce GTX 650 Ti 86400 MB/sec
Difference: 48000 (56%)

Texel Rate

The GeForce GTX 650 Ti should be a bit (approximately 18%) faster with regards to AF than the Radeon HD 6870. (explain)

GeForce GTX 650 Ti 59392 Mtexels/sec
Radeon HD 6870 50400 Mtexels/sec
Difference: 8992 (18%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 6870 is superior to the GeForce GTX 650 Ti, by a large margin. (explain)

Radeon HD 6870 28800 Mpixels/sec
GeForce GTX 650 Ti 14848 Mpixels/sec
Difference: 13952 (94%)

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.

Price Comparison

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GeForce GTX 650 Ti

Amazon.com

Radeon HD 6870

Amazon.com

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 650 Ti Radeon HD 6870
Manufacturer nVidia AMD
Year October 2012 October 2010
Code Name GK106 Barts XT
Memory 1024 MB 1024 MB
Core Speed 928 MHz 900 MHz
Memory Speed 5400 MHz 4200 MHz
Power (Max TDP) 110 watts 151 watts
Bandwidth 86400 MB/sec 134400 MB/sec
Texel Rate 59392 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 14848 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 768 1120
Texture Mapping Units 64 56
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 28 nm 40 nm
Transistors 2540 million 1700 million
Bus PCIe 3.0 x16 PCIe x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.3 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type RAM, the result should be multiplied by 2 once 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, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total 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 applied per 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 amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Comments

2 Responses to “GeForce GTX 650 Ti vs Radeon HD 6870”
Tom Hanners says:

I wonder how Nvidia can take a 128 Bit Mem bus card, And then make it completely outclass other AMD cards with a 256 bit bus? I thought their 128 Bit bus cards were junk I even used to laugh at them, Then my ATI 5870 fried, And I then bought a GTX-650_Ti on sale for $90 bucks, And was completly shocked by its performance. It completely outperforms my old ATI 5870 in all my games old and new, I can never go back to AMD now. (unless of'course I get a good deal) I never pass up a good deal.

Bleh says:

I just bought a gtx 650 ti 2gb edition, I'm liking it much better than my HD 7770 so far. I wanted to go smaller, silent and less power consumption. That's exactly what I got out of the gtx 650 nicely done Nvidia. Keep this track record and you might even get me to stop using ATI period.

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