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Old September 6, 2010, 10:59 AM
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I found this on another website, my head is spinning now lol
I'm trying to figure out if I should go i5 or 965 myself right now.



"From the manual of GA-P55A-UD3P, it is stated that when the Turbo SATA3 or USB 3.0 is enabled, the PCIe graphics slot will drop from PCIe x16 to PCIe x8.
You would have to choose if you want maximum graphics performance or maximum disk performance. These new boards uses the NEC 3.0 chip and SATA 3 which requires more bandwidth than just PCIe x1. As the P55 and CPU does not have enough lanes to support, the PCIe x16 is reduced to PCIe x8.
Although PCIe x8 won’t give you much of a performance dip, it gives you maximum USB3.0 performance at the expense of the 8 lane instead of 16. Now the issue is, if we still want Turbo SATA3 and USB 3.0 and want SLI or CrossFire with 2 cards. Will the two PCIe slots be running at Dual 4x (4x + 4x) ? Do let us know if you own the P55 series of boards with NEC USB 3.0 on board.
Gigabyte has replied to us
First of all, if users really want to use CrossFire / SLI on a P55 motherboards, as you know the PCI-e x16 lanes will split into 2 x8 lanes, besides that users are still able to enjoy the benefits of USB 3.0 and SATA 6G.
It is only when user is using one graphics card, then the user is able to select whether he wants to use the full bandwidth of USB 3.0 or SATA 6G. Of course, according to our manual had clearly stated the PCI-e graphics will operate in x8 mode. But the true fact is, there’s no identical performance drop comparing with a PCI-e x16 to a PCI-e x8 graphics.
Plus, our implementation gives users a more flexible choice and paying less money to enjoy USB 3.0 / SATA 6G.
When CF/SLI is running in dual 8X, the SATA3 and USB3 will be running in non turbo mode, getting the PCie lane from the P55 chipset instead of from the CPU, thus allowing the CF/SLI to run in Dual 8x mode"
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  #12 (permalink)  
Old September 6, 2010, 11:07 AM
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Originally Posted by Stensby View Post
First off, thanks for finding this! However, after reading some material it seems that using the USB3.0/SATA 6.0Gb/s ports the graphics cards lanes are reduced? Am i understanding that right? Is this a problem with all P55?
this is not a "problem" mobo makers have to find the extra bandwidth somewhere for sata3
x16/x8 is only a few frames of difference in games, so not a deal breaker at all
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  #13 (permalink)  
Old September 6, 2010, 11:07 AM
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the difference between x8 and x16 is not big so even if you have a 200+ dollar videocard,yes its there but not enormous techPowerUp :: GeForce GTX 480 PCI-Express Scaling Review :: Page 24 / 25
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  #14 (permalink)  
Old September 6, 2010, 02:35 PM
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After comparing prices and performance I have decided to go with the AM3 setup. We will save 75 dollars, and the performance will still be more than enough for him. Thanks for the input!
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