What's the use of PCIe x1 slots on a crossfire board?

Dewfuss

Junior Member
Dec 19, 2007
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Long time reader.. 1st time poster... so bear with me. If anyone can understand my thoughts on this it would be you people. :)

<Rant Mode On>
My current Asus P5K Deluxe board has 2 PCIe x16 slots obviously. It also has 3 PCI slots and 2 PCIe x1 slots. Asus in their infinite wisdom <insert sarcasm> have decided that the layout would be best servered by blocking 2 of the PCI slots when using both PCIe x16 slots.
When using any current enthusiast video card.. which is why you'd get a dual PCIe x16 board right?.... 2 of the 3 PCI slots are blocked by the ducted fans found on most current video cards. And of course since both PCIe x16 slots are being used both of the nonblocked PCIe x1 slots are nonfunctional.

Bottom line is you only have 1 functional (PCI) slot available after installing both video cards.

I'm not specifically picking on Asus. In doing research I've found all of the Motherboard makers appear to follow the same stupidity as Asus. I realize the amount of engineering that goes into designing of the multilayered boards but why can't they use some of that engeneering mind power to Move the PCIe x1 slots next to the PCIe x16 slots so that only the PCIe x1 slots are blocked when using dual video cards thus freeing up the PCI slots for use? With the current crop of crossfire boards laid out the way they are... why even bother with more than 1 PCI slot anyway if they can't be used?
<Rant Mode Off>

<Question Mode on>
Can anyone reccomend a P35 or better based motherboard that will allow the use of Dual PCIe x16 slots with ducted fans that will allow use of at least 2 other ports? Am I asking too much to be able to run a sound card and a TV tuner card at the same time on a crossfire board? My requirements are for an Intel quad core CPU and FSB and Memory speed of 1066 which pretty much rules out anything older than a P35 chipset.

Yes I know I can get a USB based TV tuner but who really wants yet another box laying on the desk and yet another wall wart power cord to deal with? Yes I know I could use the onboard soundcard.. but who really wants to use their precious CPU cycles to run a mostly software based sound solution? And yes I do need dual video cards to be able run my 4 monitors. Why I need 4 montitors would be the subject of a whole other thread. :laugh:
 

renethx

Golden Member
Apr 28, 2005
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Originally posted by: Dewfuss
Bottom line is you only have 1 functional (PCI) slot available after installing both video cards.

I'm not specifically picking on Asus. In doing research I've found all of the Motherboard makers appear to follow the same stupidity as Asus.
That's not true.

Originally posted by: Dewfuss
Can anyone reccomend a P35 or better based motherboard that will allow the use of Dual PCIe x16 slots with ducted fans that will allow use of at least 2 other ports?
The answer is:
  • abit IP35 Pro. You can use 3 slots: 1 x PCIe x1 slot and 2 x PCI slot with CrossFire.
  • ASUS P5E WS Professional. The same as above (PCI-X is backward-compatible with PCI).
 

GundamF91

Golden Member
May 14, 2001
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How many peripherals card are using PCI-e x1 slot? Not that many I can think of. Maybe if there's a soundcard.
 

renethx

Golden Member
Apr 28, 2005
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Originally posted by: GundamF91
How many peripherals card are using PCI-e x1 slot? Not that many I can think of. Maybe if there's a soundcard.

There are a bunch of PCIe x1 TV tuner cards:
  • Saber Combo PCIe
  • ATI HD 650 Combo PCIe
  • AVerTV Combo PCIe
  • Vbox Cat's Eye eDTA-164
  • Fusion HDTV5 EXpress
ASUS will annouce the PCIe x1 version of the Sonar sound card soon. Creative is releasing PCIe x1 sound cards too.

PCI Express (x1, x4, x8) RAID controller cards are popular.
 

Dewfuss

Junior Member
Dec 19, 2007
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Thanks for the reply renethx :)

Originally posted by: renethx

The answer is:
  • abit IP35 Pro. You can use 3 slots: 1 x PCIe x1 slot and 2 x PCI slot with CrossFire.
  • ASUS P5E WS Professional. The same as above (PCI-X is backward-compatible with PCI).



  • The IP35 Pro does not support the 1066 bus speed I require but otherwise is a nice board. It only blocks one of the PCI slots. Though unless this board has more than the standard 32 PCIe channels the x1 slot would not be usable once 2 x16 video cards are installed. This is the problem I have on my current board.

    Also, I humbley beg to differ on your comment of the PCI-X slot, as seen on the ASUS P5E WS Professional, being backwards compatible. If you compare the slots, a standard PCI card will not physically fit in a PCI-X slot. So this card would also only leave me one avialable PCI slot.

    I do appreciate the time taken to reply though. I see you're always willing to be helpful.

    If anyone else can reccommend a board that will suit my needs please let me know.
 

Dewfuss

Junior Member
Dec 19, 2007
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Originally posted by: renethx

There are a bunch of PCIe x1 TV tuner cards:
  • Saber Combo PCIe
  • ATI HD 650 Combo PCIe
  • AVerTV Combo PCIe
  • Vbox Cat's Eye eDTA-164
  • Fusion HDTV5 EXpress
ASUS will annouce the PCIe x1 version of the Sonar sound card soon. Creative is releasing PCIe x1 sound cards too.

PCI Express (x1, x4, x8) RAID controller cards are popular.

The ATI HD 650 Combo PCIe is the one I attempted to use in my current P5K board but once I installed the x1 card.. I lost both my second video card and the TV tuner. I contacted ASUS tech support and they confirmed my suspicion that the of lack of available PCIe channels was the culprit. They told me I could either use 1 video card and the x1 slots or 2 x16 cards and no x1 slots. Hence my original Rant. :|
 

renethx

Golden Member
Apr 28, 2005
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Originally posted by: Dewfuss
The IP35 Pro does not support the 1066 bus speed I require but otherwise is a nice board. It only blocks one of the PCI slots. Though unless this board has more than the standard 32 PCIe channels the x1 slot would not be usable once 2 x16 video cards are installed. This is the problem I have on my current board.

Also, I humbley beg to differ on your comment of the PCI-X slot, as seen on the ASUS P5E WS Professional, being backwards compatible. If you compare the slots, a standard PCI card will not physically fit in a PCI-X slot. So this card would also only leave me one avialable PCI slot.
IP35 Pro does support FSB 1066MHz. If you read Newegg.com Customer Reviews, you will immediately notice that many users are using FSB 1066 processors (e.g. Q6600) with this board. As a matter of fact, the support for FSB 1066 is part of the specifications of P35 and every P35 motherboard supports FSB 1333, 1066 and 800 (I haven't seen exceptions).

Abit carefully designed the board so that the PCI Express x1 slot is usable even if the second PCI Express x16 is used. They used dual PCI Gb LAN for IP35 Pro instead of a PCI Express Gb LAN (used in most other motherboards), so the six PCI Express lanes in ICH9R are assigned this way: 4 for the second PCI Express x16 slot, 1 for the PCI Express x1 slot and 1 for the JMB363 IDE/SATA controller.

As for PCI-X, the PCI-X slot (3.3V, 64-bit) of the ASUS motherboard does support universal PCI cards (most of the current PCI cards are universal 3.3V/5V that are double keyed).
 

Dewfuss

Junior Member
Dec 19, 2007
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Thanks renethx.

Now that's why I came here to ask the question. You guys know your stuff. :)

I was misinformed by newegg's listed specs for the IP35 Pro which only lists FSB as only supporting 800MHz. Thank you for the correction.

When I bought the Asus P5K board I assumed they were doing something similar to what Abit does with the PCIe channels. That'll teach me to assume. :) Now I'm wondering if the Tech guy at Asus I talked to even knew what he was talking about. I think I'll give them another call to see if I get the same answer this time.

Now you know why I "humbley" begged to differ regarding the PCI-X slot. My only exposure to that particular type slot is on the HP servers at work which are not compatible with standard PCI cards. Per HP, they are not compatible though if you want to replace the riser card with one that has standard PCI's they'll be more than happy to sell you the part.

I will take a fresh look at the boards you reccommended. It's much appreciated. :thumbsup:

 

Heidfirst

Platinum Member
May 18, 2005
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a lot of reviews disparaged abit for daring to be different & not having PCI-E LAN on the IP35 Pro so it's nice to see that even a few people see the advantage behind their thinking.

Of course the fact that abit also do a x1 PCI-E Wifi (AirPace) card may have coloured their thoughts slightly.