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Author Topic: PCI-e 1x extender in PCI-e 16x slot - possible??  (Read 6109 times)
piggybank
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June 08, 2011, 11:01:33 PM
 #1

I've currently got 4x 5870's in a rig, each connected using a modified 1x PCI-e extender to a GA-770T-D3L motherboard. PSU is a 1000watt Coolmaster SilentProM and is showing sub 650watt currently.

3 of them are connected into a 1x PCI-e slot and are recognised with lspci and run poclbm happily enough.

1 of them is connected into a 16x PCI-e slot. This does not show up with lspci.

I've not done much more investigation on this, but I was wondering, is using a 1x PCI-e extender from a 16x slot to a 16x card possible? I was sure it was. Is the motherboard being picky about the type of card in the slot?
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Inaba
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June 08, 2011, 11:43:24 PM
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You have to bridge the pins... A1 and B17 or something like that.  Search.

If you're searching these lines for a point, you've probably missed it.  There was never anything there in the first place.
piggybank
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June 12, 2011, 10:41:04 AM
 #3

I did try searching, but obviously using the wrong terms.

Eventually opted for a 16x PCI-e riser... didn't want to mess around and potentially brick a motherboard, time is money, you know.

The 16x PCI riser does the trick, can now get 5 cards in and the machine booting.

Unfortunately, I can't seem to get the ATI fglrx to work with 5x 5870's. Whenever X starts the machine halts. Can't seem to get anything meaningful out of Xorg.log, syslog, dmesg, etc etc.
Lightspeed
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June 12, 2011, 10:47:02 AM
 #4

i've bought one of these

http://www.ebay.com.au/itm/new-PCI-E-Extension-Cable-1X-16X-Riser-Card-Adapter-/170653878223

waiting for it to arrive

Overclocking = money? Greatest full time hobby ever!
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bcpokey
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June 12, 2011, 10:50:04 AM
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Wow $6, good deal. Sorta makes me wish I hadn't balanced my PSUs so perfectly with my rigs. Ah well c'est la vie.

EDIT: Seems to be blocked in america anyway?
Lightspeed
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June 12, 2011, 11:17:24 AM
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Wow $6, good deal. Sorta makes me wish I hadn't balanced my PSUs so perfectly with my rigs. Ah well c'est la vie.

EDIT: Seems to be blocked in america anyway?

blocked in america? search ebay for "PCI-E 1x to 16x adapter" works for me

does anyone know with the one i've purchased if it will require modifications to work?

Overclocking = money? Greatest full time hobby ever!
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