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PCIE 2.0 running at 2.5Ghz, why?

Last response: in Graphics & Displays
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February 19, 2009 1:43:36 PM

Hi,

Both the mobo and the video card are pcie 2.0. Therefor the clock speed should naturally be 5Ghz and not the older 2.5 Ghz. Any ideas as to why? Its an ECS Gf8200A, and there is no way to adjust this in the BIOS.

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February 19, 2009 1:48:29 PM

...Its clear you have no idea what you're talking about.

There is no increase in speed from PCI-e 1.x, only a badwith increase from .25 GB/s to .50 GB/s.
February 19, 2009 1:55:49 PM

Perhaps. But what then does this line from an Anand Tech article mean?


"PCI Express 2.0 builds upon PCI Express 1.x primarily through the doubling of the clock rate to 5.0GHz (up from 2.5GHz). "
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February 19, 2009 2:50:13 PM

Where do you see it running at 2.5Ghz?
February 19, 2009 4:02:19 PM

Good question. In Ntune, on the motherboard page, there is a slider that has 2.5Ghz on one end and 5Ghz on the other. Incidently, the bus link identified in Everest, GPUZ or 3dMark, states PCIE1.0x16.

So I am wondering why would a 2.0 card on a 2.0 board run at the 1.0 clock speed and identify as a1.0 bus link. Does this make sense?
February 19, 2009 5:37:55 PM

patrick_34 said:
Good question. In Ntune, on the motherboard page, there is a slider that has 2.5Ghz on one end and 5Ghz on the other. Incidently, the bus link identified in Everest, GPUZ or 3dMark, states PCIE1.0x16.

So I am wondering why would a 2.0 card on a 2.0 board run at the 1.0 clock speed and identify as a1.0 bus link. Does this make sense?


Update the BIOS, NB chipset driver. I guess it would solve it.

Or, you running a 1.0 16x GPU, and he detects the speed hes running atm. The latter is my best bet.
February 20, 2009 12:24:20 PM

gamerk316 said:
Your confusing data transfer rate and speed.

http://en.wikipedia.org/wiki/PCI_Express


Both BIOS and Drivers are up to date. Card is En9800gt. The wiki piece seems to indicate pcie clock rate should be 2.5Ghz, while Anand Tech article claims 5.0Ghz. Am I reading this right?
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