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Title: unstable speed in PCIe x1 extender Post by: no_alone on June 17, 2011, 10:06:21 AM Hello,
I have a pc with 2 5850, 1 PCI-e x16 and 1 PCI-e x 1 And I'm experiencing unstable speed on the PCI-e x1 Anyone know what could be the reason for this?? bolth of the cards are overclocked 850,900 and one is stable on 320MH/S and the second one the PCI-Ex1 is going up and down between 260 to 320... Anyhelp will be great thank you Title: Re: unstable speed in PCIe x1 extender Post by: hugolp on June 17, 2011, 10:23:07 AM Im getting stable speed of 441Mh/s on a 5870 using a pci-e x1 to x16 extender (the extender has a molex to get the energy from the PS directly and not from the motherboard, got it at cablesaurius).
Title: Re: unstable speed in PCIe x1 extender Post by: no_alone on June 17, 2011, 11:01:02 AM Well I dont use a one with a molex. .Maybe I can modify it?
Could this be the problem? Title: Re: unstable speed in PCIe x1 extender Post by: kripz on June 17, 2011, 01:54:23 PM http://pinouts.ru/Slots/pci_express_pinout.shtml
Reroute 12v from PCI-E to draw from molex. Title: Re: unstable speed in PCIe x1 extender Post by: Freakin on June 17, 2011, 04:28:28 PM http://pinouts.ru/Slots/pci_express_pinout.shtml Reroute 12v from PCI-E to draw from molex. just pin 2 running to 12v in a molex connector is all you need? Got a bunch of 1x extenders and don't want to wait to get some ones w/ molex from cablesarus wasn't able to use my 3rd 5830 in a p5w DH. I'm sure i'll have bigger problems trying to get 3x 5830 & a 5870 running in my 939 lanparty board Title: Re: unstable speed in PCIe x1 extender Post by: Freakin on June 17, 2011, 04:33:45 PM nevermind, found it
Quote I modified each of the four flexible PCIe extenders to re-route the five 12V lines (PCIe pins A2, A3, B1, B2, B3) to a single 16AWG stranded wire directly connected to one of the 12V outputs of the power supply. http://blog.zorinaq.com/images/flex-pcie-4x-modified.jpg http://blog.zorinaq.com/?e=44 Here is the prebuilt product from cablesarus, with BTC accepted https://cablesaurus.com/index.php?main_page=product_info&cPath=1&products_id=11 Title: Re: unstable speed in PCIe x1 extender Post by: kripz on June 18, 2011, 04:51:47 AM The thing i dont understand is, 1000000A is being sucked in via molex but has to exit through the PCI lane, why dont people modify the negative?
Title: Re: unstable speed in PCIe x1 extender Post by: no_alone on June 19, 2011, 10:02:32 AM nevermind, found it In this website it say it re-routed 5 12v lines...Quote I modified each of the four flexible PCIe extenders to re-route the five 12V lines (PCIe pins A2, A3, B1, B2, B3) to a single 16AWG stranded wire directly connected to one of the 12V outputs of the power supply. http://blog.zorinaq.com/images/flex-pcie-4x-modified.jpg http://blog.zorinaq.com/?e=44 Here is the prebuilt product from cablesarus, with BTC accepted https://cablesaurus.com/index.php?main_page=product_info&cPath=1&products_id=11 http://pinouts.ru/Slots/pci_express_pinout.shtml Reroute 12v from PCI-E to draw from molex. But from this chart you can understand that there are only 4 12v lines A2 A3 B1 B2 B3 is Reserved and not 12V ... Soo do I also re-route him or not? thank you. Title: Re: unstable speed in PCIe x1 extender Post by: kripz on June 19, 2011, 10:50:17 AM Dont know, i'd advise looking up the PCI-E specs when messing with an expensive computer/gfx card.
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