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SB MB for SLI/CF with a PCIe sound card?

post #1 of 4
Thread Starter 
I was about to spring for an ASUS P8P67 Deluxe - and then I read an ASUS FAQ that stated that the use of 2-way SLI/CF meant that the PCIe X1 slots would not function properly (someone was complaining that their sound card was not working in one of these slots when they ran a CF setup).

Am I right in thinking that one of either the GA-P67A-UD7 or Maximus 4 Extreme do not have this glaring limitation as they have the Nvidia 200 PCIe lane-splitting chip? And would use of a sound card in either of these 2 degrade the video CF/SLI performance?

Thanks in advance.
post #2 of 4
Thread Starter 
Here is the actual ASUS FAQ text related to this issue:

Quote:
Recently I bought this motherboard to build a new system with CrossFire configuration. After the CrossFire system is up and running, I found that the PCIE x1 slot does not function. If I change the system configuration to single VGA card, then the PCIE x1 slot works without any issue. Is this normal?
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Solution

This is normal. The PCIE x1 slot shares the PCIE lanes with the second PCIE x16 slot. When the CrossFire function is in use, the second PCIE x16 slot occupies all the available PCIE lanes. Therefore, the PCIE x1 slot is disabled due to lack of resource.
post #3 of 4
look at this, with the P67A-UD4 the PCI-E 1x lanes are controlled and routed directly to the PCH not the CPU, so their PCI-E lanes do not get in ther way. The PCH has 8 1x lanes.


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X99 Main Rig
(10 items)
 
  
CPUMotherboardGraphicsRAM
Intel 5960X Extreme Edition @ 4.5GHz Always Changing VisonTek R9 290 G.Skill Ripjaws 4 16GB (4x4GB) DDR4 @ 3200MHz 
Hard DriveHard DriveHard DriveCooling
Samsung 128GB M.2 PCI-E 4x SSD Apotop 256GB SSD 1.82TB NAS Noctua NH-D15 with both fans 
OSPower
Win7 Pro Enermax 1000W 
  hide details  
Reply
post #4 of 4
Thread Starter 
Thanks for the response - why ASUS didn't use a similar architecture is beyond me, a lot of us still want to use a high-end discrete sound card to complement CF/SLI visuals, and jamming a sound card up right next to the fans of a video card by putting it in the bottom-most X4 slot (as the P8P67 series forces you to) is not really a viable layout.

Re the use of a Gigabyte MB, however, the reviewers have hammered the Gigabytes for not leaving nearly enough space between the X16 slots that give best performance for CF/SLI, so the PCIe problem is replaced with a potential overheating/noise issue.

Doing a bit more research I have found what looks to be a workable MB for my build - the WS Revolution. It has the nVidia bridging chip which deals with the shared lanes issue, plus a fantastic slot layout allowing plenty of space between 2 CF'd cards, with the additional benefit that neither card's fans will be partially blocked by the sound card placement.
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