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p67 16x8x vrs 8x8x - Page 2

post #11 of 21
Quote:
Originally Posted by Eugenester View Post
LOLWUT? A CPU does not provide any PCIe lanes, that's the northbridge. Also, there is a negligible difference between x16/x16 x8/x8, as well as x4/x4. The P67 chipset provides a max of 16 PCIe lanes. That means any regular P67 board is limited a x16 or x8/x8. x16/x4 is a BONUS, NOT A CHEAPSKATE MOVE.
So my build will be fine with saving money getting a Asus P67 Deluxe and Dual GTX 580s in x8/x8 vs spending more getting a Gigabyte UD7 and Dual GTX 580s in x16/x16?
    
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post #12 of 21
Quote:
Originally Posted by Leethal View Post
So my build will be fine with saving money getting a Asus P67 Deluxe and Dual GTX 580s in x8/x8 vs spending more getting a Gigabyte UD7 and Dual GTX 580s in x16/x16?
You'll see about a 5-8 fps difference, maybe 10 at MOST.
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post #13 of 21
Quote:
Originally Posted by JMCB View Post
Actually, with sandy bridge, you're wrong. The CPU actually provides the extra lanes for the video cards. Any motherboards with anything more than 8x/8x are using a bridge chip.
Proof?
Edited by Eugenester - 1/6/11 at 6:06pm
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post #14 of 21
Thread Starter 
Quote:
Originally Posted by Eugenester View Post
LOLWUT? A CPU does not provide any PCIe lanes, that's the northbridge. Also, there is a negligible difference between x16/x16 x8/x8, as well as x4/x4. The P67 chipset provides a max of 16 PCIe lanes. That means any regular P67 board is limited a x16 or x8/x8. x16/x4 is a BONUS, NOT A CHEAPSKATE MOVE.
Sorry, I'm no expert. I actually meant the chipset than. Anyway they could keep this BONUS and provide a x8/x8 mode for us.
Edited by Firanford - 1/6/11 at 6:06pm
post #15 of 21
Quote:
Originally Posted by Firanford View Post
Sorry, I'm no expert. I actually meant the chipset. Anyway they could keep this BONUS and provide a x8/x8 mode for us.
While the second slot is physically x16, it's electrical set at x4. You won't be able to change that.

And I believe the reason that some board manufacturers were able to get the third PCIe slot at x4 is because of a provided PCIe controller.
post #16 of 21
Quote:
Originally Posted by Firanford View Post
Sorry, I'm no expert. I actually meant the chipset than. Anyway they could keep this BONUS and provide a x8/x8 mode for us.
Some high-end mobos will include a NF200 chip for 3-way sli at x16/x8/x8 IIRC.
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post #17 of 21
Quote:
Originally Posted by Eugenester View Post
You'll see about a 5-8 fps difference, maybe 10 at MOST.
Would a Dual GPU Card like the 5970 or 6990 be a better option than two GTX 580s SLI x8/x8?
    
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post #18 of 21
Quote:
Originally Posted by Eugenester View Post
Proof?
Pwnd? =P

post #19 of 21
Quote:
Originally Posted by Leethal View Post
So my build will be fine with saving money getting a Asus P67 Deluxe and Dual GTX 580s in x8/x8 vs spending more getting a Gigabyte UD7 and Dual GTX 580s in x16/x16?
It's the same as the P55 chipset. Only time you need more than x16 lanes [ie. nf200] is when using 3 GPU's.


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post #20 of 21
Quote:
Originally Posted by JMCB View Post
Pwnd? =P

Some additional diagrams showing how NF200 works (from ASUS):





(M4E = Maximus IV Extreme)
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