FS: PCI-Express Extender Cables(w/ Molex)*GPU Dummy Plugs*PSU Adapters - page 12.

Chris Acheson

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Activity: 266

Merit: 251

Quote from: Coma on June 01, 2011, 08:14:47 PM

For the 1x 16x w/Molex conector it states:
# The molex connector helps prevent physical cable damage and possible motherboard wear from running a dual-GPU video card through an extender cable

I don't know if I need a molex conector. Does this means it is better but not necessary in any case?

Take a look at this: http://blog.zorinaq.com/?e=44

If all you've got is one card, you don't need the molex connector, as the cable itself can handle the current that the card draws from the motherboard. The problem is when you're running multiple cards, the power drawn through the motherboard all adds up, and can potentially melt something.

I don't know the exact point at which you need the molex connector. I went with it for the single 5970 on my 5-card rig. Maybe I could have gotten away with not using it, but I didn't want to take the chance.

Coma

full member

Activity: 140

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For the 1x 16x w/Molex conector it states:
# The molex connector helps prevent physical cable damage and possible motherboard wear from running a dual-GPU video card through an extender cable

I don't know if I need a molex conector. Does this means it is better but not necessary in any case?

sc8nt4u

sr. member

Activity: 286

Merit: 250

Quote from: mewantsbitcoins on June 01, 2011, 05:10:38 PM

Hi,

I'm having a problem with my third card. I have this motherboard and 3 5870. Two are in pci e x16 slots and working OK. I bought x16 to x1 converter to get the third in, but my computer doesn't recognize the third card - I can only see 2 in device manager.
I am running Windows7 and already tried the solution suggested earlier in this thread shortening A1 and B17. I'm sure I did it right because I checked the connection with multimeter.

Haha, I like the picture. Sorry I can't help you though.

mewantsbitcoins

full member

Activity: 126

Merit: 101

Hi,

I'm having a problem with my third card. I have this motherboard and 3 5870. Two are in pci e x16 slots and working OK. I bought x16 to x1 converter to get the third in, but my computer doesn't recognize the third card - I can only see 2 in device manager.
I am running Windows7 and already tried the solution suggested earlier in this thread shortening A1 and B17. I'm sure I did it right because I checked the connection with multimeter.

Cablesaurus

sr. member

Activity: 302

Merit: 250

Quote from: Cryptoman on June 01, 2011, 12:40:18 PM

I've also noted that some of the low-end microATX boards with one X1 and one X16 slot will not support use of both slots simultaneously. I have a couple of machines with cards in the X16 slot to which I was hoping to add another card using the X1 to X16 adapter.

That'd be motherboard related if booting 2 cards wasn't supported, unrelated to using an extender.

Cryptoman

hero member

Activity: 726

Merit: 500

Quote from: Thor on June 01, 2011, 11:55:26 AM

I have just received several of these cables and seem to be running into a problem not described anywhere else here.

If I have a card plugged into an adapted x1 ->x16 cable (plugging the extender into an x16 slot) the computer refuses to boot at all. Using a combination of sapphire 5850s and 5870s on a Crosshair IV Formula motherboard. This happens even if I am only plugging in one of the cards that works when plugged straight into the motherboard, so I am confident it isn't any sort of ATX power issue. I have tried with, and without, the pins shorted as shown in many of the diagrams here.

I appreciate any help or insight anyone here may be able to offer.

Thank you.

I've also noted that some of the low-end microATX boards with one X1 and one X16 slot will not support use of both slots simultaneously. I have a couple of machines with cards in the X16 slot to which I was hoping to add another card using the X1 to X16 adapter.

Cablesaurus

sr. member

Activity: 302

Merit: 250

Quote from: Thor on June 01, 2011, 11:55:26 AM

I have just received several of these cables and seem to be running into a problem not described anywhere else here.

If I have a card plugged into an adapted x1 ->x16 cable (plugging the extender into an x16 slot) the computer refuses to boot at all. Using a combination of sapphire 5850s and 5870s on a Crosshair IV Formula motherboard. This happens even if I am only plugging in one of the cards that works when plugged straight into the motherboard, so I am confident it isn't any sort of ATX power issue. I have tried with, and without, the pins shorted as shown in many of the diagrams here.

I appreciate any help or insight anyone here may be able to offer.

Thank you.

Hi Thor, some motherboards will boot with the 1x->16x adapter plugged into the 16x slot, however in many cases you would need a straight 16-16x cable. Send me an e-mail to [email protected] and I can get a replacement in order if necessary.

Thor

newbie

Activity: 27

Merit: 0

I have just received several of these cables and seem to be running into a problem not described anywhere else here.

If I have a card plugged into an adapted x1 ->x16 cable (plugging the extender into an x16 slot) the computer refuses to boot at all. Using a combination of sapphire 5850s and 5870s on a Crosshair IV Formula motherboard. This happens even if I am only plugging in one of the cards that works when plugged straight into the motherboard, so I am confident it isn't any sort of ATX power issue. I have tried with, and without, the pins shorted as shown in many of the diagrams here.

I appreciate any help or insight anyone here may be able to offer.

Thank you.

pokermon919

member

Activity: 84

Merit: 10

Quote from: Cablesaurus on May 31, 2011, 01:03:27 AM

Shorting the presence detect pins should correct this issue, one would bridge pins A1 & B17 as in this picture:

A 24-ga wire should slide right into place without forcing.

This is something that seems to effect a small percentage of motherboards, while on the majority it won't be necessary.

Ok shorting the pins work! If your comp won't pick up from a pcie 1x slot short it like this picture. At first it didn't work for me probably because I didn't have a solid connection since the holes are so small.

trentzb

sr. member

Activity: 406

Merit: 251

It depends on whether your PSU is a single rail or multi rail. Also the gauge of the wire supplying the molex connectors should be taken into consideration. On some cheap secondary (~350W) PSUs I was using the molex connectors which had approximately 20-24 AWG wire, I melted both the molex connector and wire connected to a 5850 via molex to 6-pin adapters.

lastobelus

newbie

Activity: 5

Merit: 0

ok, seems like I'll need to use a dremel tool.

Now the question is power: I'm already using a cpu->pci and 2x molex -> pci.

I have only 2 more molex connectors on the PSU (which has plenty of watts -- 1250)

Do any of these have a chance of working, and which is likely to be better:

1. Split one of the pci connectors
2. Supply half of each of two molex->pcie adapters from a single molex line, using these adapters in two different gpus
3. Split the CPU line (cpu is a sempron 145, and I'm running headless so cpu usage is around 5%. so draw on the cpu line should be pretty low currently)

Inaba

legendary

Activity: 1260

Merit: 1000

Depends on the fan shroud on your GPU. Most shrouds are too low to fit an extender in it. Some aftermarket (and stock) coolers have some space between the HS and the board, you can run the extender up through the HS and then over to where you need it.

As far as the jumper goes for presence detect, all my motherboards required it, so I soldered the wire onto the extender. I will try to get a picture of it later today.

lastobelus

newbie

Activity: 5

Merit: 0

Will the 1x extender fit underneath a GPU? For example my rig uses an MSI 790 gd70, with 4 gpus. I'd like to add a fifth using the pci 1x slot, but I'm not sure if I'll need to also extend the gpu that covers that slot.

pokermon919

member

Activity: 84

Merit: 10

Thanks Cable, I'll be giving it a try first thing in the morning tomorrow.

Cablesaurus

sr. member

Activity: 302

Merit: 250

Shorting the presence detect pins should correct this issue, one would bridge pins A1 & B17 as in this picture:

A 24-ga wire should slide right into place without forcing.

This is something that seems to effect a small percentage of motherboards, while on the majority it won't be necessary.

IlbiStarz

full member

Activity: 336

Merit: 100

Quote from: marcus_of_augustus on May 30, 2011, 08:56:24 PM

Quote from: IlbiStarz on May 30, 2011, 08:29:33 PM

So using 2 power supplies with these is a no go?

Do you have trouble reading dude?

Ahh..I reread everything...
I'll just buy the Lian Li adapter from FrozenCPU..that should solve my problem!

Alright, time to order some of these modified cables Cheesy

pokermon919

member

Activity: 84

Merit: 10

Quote from: Chris Acheson on May 30, 2011, 09:53:41 PM

Quote from: pokermon919 on May 30, 2011, 09:28:12 PM

Hey guys I just got my 1x->16x extender and I can't get my comp to pick up the 3rd card. I've tried with and without dummy plug, still no go. Can anyone post up a picture of using a 1x slot with the extender to the vid card? My buddy tried everything even messing with bios and nothing seem to get the video card detected.

Comp stats:

-Win 7 64bit
-Already running 2- 5870, using extender to plug in a third card
-Mother board is Asus P5k Pro with both 16x slots already used and using the extender on a 1x slot.

Any help would be much appreciated!

Try running one of the known-good cards on a known-good slot through the extender. If that doesn't work, either there's a problem with the extender, or you may need to short the presence-detect pins as shown here: http://blog.zorinaq.com/?e=42

Just checked out that article and I see there are 2 pins that must be shorted if the motherboard doesn't allow down pluging. What is it I'm supposed to use to short it with?

IlbiStarz

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Activity: 336

Merit: 100

Quote from: marcus_of_augustus on May 30, 2011, 08:56:24 PM

Quote from: IlbiStarz on May 30, 2011, 08:29:33 PM

So using 2 power supplies with these is a no go?

Do you have trouble reading dude?

Didn't Inaba say that there are issues with grounding/frying parts? How would you hook up another power supply so that both would turn on when you turned the computer on? There are only guides on how to jump start it...

pokermon919

member

Activity: 84

Merit: 10

Quote from: Chris Acheson on May 30, 2011, 09:53:41 PM

Quote from: pokermon919 on May 30, 2011, 09:28:12 PM

Hey guys I just got my 1x->16x extender and I can't get my comp to pick up the 3rd card. I've tried with and without dummy plug, still no go. Can anyone post up a picture of using a 1x slot with the extender to the vid card? My buddy tried everything even messing with bios and nothing seem to get the video card detected.

Comp stats:

-Win 7 64bit
-Already running 2- 5870, using extender to plug in a third card
-Mother board is Asus P5k Pro with both 16x slots already used and using the extender on a 1x slot.

Any help would be much appreciated!

Try running one of the known-good cards on a known-good slot through the extender. If that doesn't work, either there's a problem with the extender, or you may need to short the presence-detect pins as shown here: http://blog.zorinaq.com/?e=42

I've tried different cards and switched them around and all the cards are in good working order. I'll look into that link you sent me thanks Chris. More help please! I have 400mhash that isn't being utilized, the sky will fall soon if I don't get it working asap lol.

Chris Acheson

sr. member

Activity: 266

Merit: 251

Quote from: pokermon919 on May 30, 2011, 09:28:12 PM

Hey guys I just got my 1x->16x extender and I can't get my comp to pick up the 3rd card. I've tried with and without dummy plug, still no go. Can anyone post up a picture of using a 1x slot with the extender to the vid card? My buddy tried everything even messing with bios and nothing seem to get the video card detected.

Comp stats:

-Win 7 64bit
-Already running 2- 5870, using extender to plug in a third card
-Mother board is Asus P5k Pro with both 16x slots already used and using the extender on a 1x slot.

Any help would be much appreciated!

Try running one of the known-good cards on a known-good slot through the extender. If that doesn't work, either there's a problem with the extender, or you may need to short the presence-detect pins as shown here: http://blog.zorinaq.com/?e=42

Topic: FS: PCI-Express Extender Cables(w/ Molex)*GPU Dummy Plugs*PSU Adapters - page 12. (Read 83077 times)

Topic: FS: PCI-Express Extender Cables(w/ Molex)GPU Dummy PlugsPSU Adapters - page 12. (Read 83077 times)