I have the i7-940 and notice its interconnect speed is 4.8GT/s, close to the
PCIe 2.0 practical rate of 4.0GT/s (I guess 3.0 has a practical rate of
8GT/s). Does this suggest that whether or not PCIe 3.0 will be useful will
depend on the users processor? Is this transfer rate shared between the CPU
and graphics, or will both the CPU and the graphics board have this transfer
rate available?
Lee
From: [email protected] [mailto:[email protected]]
On Behalf Of Gregg Eshelman
Sent: Friday, January 21, 2011 3:41 PM
To: [email protected]
Subject: Re: [AP] graphic card
--- On Fri, 1/21/11, Uwe Soltau <[email protected]
<mailto:lenseye.uwe%40gmail.com> > wrote:
> I now discovered that the new cards are all for PCIe 2.0 x
> 16. My
> motherboard has only a PCIe x 16 slot.
> Will such a card work on such a motherboard (backwards
> compatible) obviously with reduced performance?
You'll just have to do research to find out if a PCIe 2.0 or 2.1 card is
backwards compatible with PCIe 1.x Some may not be, though they're supposed
to be.
PCIe 3.0 specifications should be finalized soon, so expect in the next
couple of years that will begin to be all that's available in new video
cards. Fortunately the older PCIe cards will all work with all newer PCIe
versions.
> Do you think a better graphics card alone would help at
> all?
It can if the video card is slow enough to be a performance bottleneck.
Having a "too fast" video card is not a bad thing. :) Then it won't be
holding back the performance of any other part of the computer.
For the adventurous, it's possible to cut a slot in the front end of a PCIe
slot to plug in a card longer than the slot. It works because all the
control lines are in the space of the x1 slot with the rest all being
additional data lanes. All PCIe cards are supposed to be able to function
with from 1 to the maximum number of lanes on the card in use. (Would be
neat if some board manufacturer would invent open ended PCIe slots. Could
have a buttress molded on either side to reinforce the open end.)
That's why some boards have things like x4 slots that are only half
connected and it's how the external ExpressCard to PCIe video card boxes for
laptops work. They have an x16 sized slot but ExpressCard is only PCIe x1
plus USB 2.0.
[Non-text portions of this message have been removed]
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