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Confusing memory clock ratings

  • Graphics Cards
  • Memory
  • Graphics
Last response: in Graphics & Displays
May 8, 2012 7:03:09 PM

So I've googled this over and over and still can't seem to find a straight answer, so sorry if this sounds stupid but I'd really like to know.

So I've been looking for a new graphics card because my old 5670 really isn't holding up anymore. I've looked at the April "Best Graphics Cards For The Money" article and saw the 6850 was the right price for me, but then I went to the end and saw the graphics card hierarchy chart.

Seeing as there was a Nvidia GTX 460 listed next to the 6850 I went to go look at it and see what the prices were like. I noticed that the gtx 460 is around the same price as the 6850 so I looked at the specs and noticed something really weird.

6850 GTX 460
Core Clock: 775 Core Clock: 788
Memory Size: 1GB Memory Size: 1GB
Memory Interface: 256-bit Memory Interface: 192-bit
Memory Type: GDDR5 Memory Type: GDDR5
Memory Clock: 1000MHz (4.0Gbps) Memory Clock: 4008MHz

All the specs are pretty similar except for the memory clock. Why is the clock on the GTX 460 so incredibly higher than the 6850. Now I know the 4.0Gbps on the 6850 is something like the bandwidth per pin but does bandwidth really make so much of a difference that the 6850 can match the GTX 460?

tldr: Why can you compare a 6850 to a GTX 460 when the 460's memory clock is incredibly higher, and what affect does the 4.0Gbps bandwidth have on the clock. Also why doesn't Nvidia list it's memory bandwidth?

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a b U Graphics card
May 8, 2012 7:08:10 PM

It's only listed that way. 6850 should also have 4GHz memory clock. The 560's is 1002 multiplied by 4 because of the GDDR5 memory.
May 8, 2012 7:32:00 PM

Truth is neither card can utilize the entire bandwidth anyway. There are various wait states for all the other components and processes going on. I can promise you you will love the Nvidia Card if you purchase it. I have this card from EVGA and have used it to record thousands of GB's of shows as well as for all the PC gaming I do. The drivers are always rock solid reliable and I have yet to find a game it does not handle with ease at 1080p.
May 9, 2012 7:32:50 PM

Thanks to both you guys, that tells me all I need to know.