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GeForce GTX 650 Ti vs Radeon HD 6870

Intro

The GeForce GTX 650 Ti comes with 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 features 768 Stream Processors, 64 Texture Address Units, and 16 Raster Operation Units.

Compare those specs to the Radeon HD 6870, which makes use of a 40 nm design. AMD has set the core frequency at 900 MHz. The GDDR5 RAM works at a speed of 1050 MHz on this particular card. It features 1120 SPUs along with 56 Texture Address Units and 32 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

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

Performance-wise, the Radeon HD 6870 should in theory be quite a bit superior to 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 just a bit (more or less 18%) better at 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 running with high levels of AA is important to you, then the Radeon HD 6870 is the winner, by far. (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

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

Model GeForce GTX 650 Ti Radeon HD 6870
Manufacturer nVidia AMD
Year October 2012 October 2010
Code Name GK106 Barts XT
Fab Process 28 nm 40 nm
Bus PCIe 3.0 x16 PCIe x16
Memory 1024 MB 1024 MB
Core Speed 928 MHz 900 MHz
Shader Speed 928 MHz (N/A) MHz
Memory Speed 1350 MHz (5400 MHz effective) 1050 MHz (4200 MHz effective)
Unified Shaders 768 1120
Texture Mapping Units 64 56
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.3 OpenGL 4.1
Power (Max TDP) 110 watts 151 watts
Shader Model 5.0 5.0
Bandwidth 86400 MB/sec 134400 MB/sec
Texel Rate 59392 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 14848 Mpixels/sec 28800 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of MB per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the interface width by its memory speed. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better 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 are processed in one second. This number is calculated by multiplying the total number of texture units by the core 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 amount of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to 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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