Message boards :
Number crunching :
2 graphic cards at 1 PCIe slot?
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Author | Message |
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Sutaru Tsureku Send message Joined: 6 Apr 07 Posts: 7105 Credit: 147,663,825 RAC: 5 |
It's possible to connect 2 graphic cards with 1 PCIe slot (using an adapter?)? Thanks. * Best regards! :-) * Sutaru Tsureku, team seti.international founder. * Optimize your PC for higher RAC. * SETI@home needs your help. * |
Keith White Send message Joined: 29 May 99 Posts: 392 Credit: 13,035,233 RAC: 22 |
No. PCIe is essentially a multi-channel 1 to 1 serial bus. Multiplexing those serial channels is possible with hardware and drivers but I know of no off the shelf product to do so. Only seen in on motherboards to "share" channels between ancillary devices like USB 3 controllers and PCIe ethernet chips. "Life is just nature's way of keeping meat fresh." - The Doctor |
Richard Haselgrove Send message Joined: 4 Jul 99 Posts: 14650 Credit: 200,643,578 RAC: 874 |
Alternatively, yes. But make sure you have deep pockets with plenty of $$$ in them. A few moments with a search engine and the keywords "PCIe expander" turns up products like: http://www.cyclone.com/products/expansion_systems/600-2707.php |
Tom* Send message Joined: 12 Aug 11 Posts: 127 Credit: 20,769,223 RAC: 9 |
GT(x) x9x usually have two GPU's for one PCIe Slot GTX690 GTX590 GTX490(well almost:-) GTx295 etc... |
spitfire_mk_2 Send message Joined: 14 Apr 00 Posts: 563 Credit: 27,306,885 RAC: 0 |
Is it possible? Yes. Should you do it? No. The best way to get two cards in one PCIe slot is to do what Tom told you, get one card that has two gpu on it. It will cost you premium, probably going to need to get a new power supply to power that beast, but that is the smart way to get two gpu in one PCIe slot. |
Keith White Send message Joined: 29 May 99 Posts: 392 Credit: 13,035,233 RAC: 22 |
GT(x) x9x usually have two GPU's for one PCIe Slot Yes those cards have two GPUs but card either splits the x16 into x8 pairs or it multiplexes the x16, switching when required. "Life is just nature's way of keeping meat fresh." - The Doctor |
Ex: "Socialist" Send message Joined: 12 Mar 12 Posts: 3433 Credit: 2,616,158 RAC: 2 |
GT(x) x9x usually have two GPU's for one PCIe Slot Which is the same thing that would happen even if you did physically hook up two cards to one slot. #resist |
Richard Haselgrove Send message Joined: 4 Jul 99 Posts: 14650 Credit: 200,643,578 RAC: 874 |
GT(x) x9x usually have two GPU's for one PCIe Slot But at least the power supply requirements will be properly accounted for. If you tried to mount two separate cards in a single slot with a passive 'Y' cable or similar, and both cards tried to draw the maximum 75W that PCIe is specified for, then you'd fry the motherboard. |
HAL9000 Send message Joined: 11 Sep 99 Posts: 6534 Credit: 196,805,888 RAC: 57 |
You might need to look for something such as this. http://www.supermicro.com/a_images/products/Accessories/RSC-R2UT-2E8R.jpg Depending on your needs a different riser might be what you need. Here is their full list. http://www.supermicro.com/support/resources/riser/riser.aspx There are several ways to do this. The main issue I would see is mounting the cards in the setup. SETI@home classic workunits: 93,865 CPU time: 863,447 hours Join the [url=http://tinyurl.com/8y46zvu]BP6/VP6 User Group[ |
musicplayer Send message Joined: 17 May 10 Posts: 2430 Credit: 926,046 RAC: 0 |
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juan BFP Send message Joined: 16 Mar 07 Posts: 9786 Credit: 572,710,851 RAC: 3,799 |
My tip, is possible, but don´t try do that, is safer and cheap buy a better MB with more slots or build a second host. Even the factory made double GPU´s have some limitations (i have few 590/690 so i know wath i´m talking) imagine a "band-aid" solution. We do something similar by ussing a PCI-extensors in order to put more GPU´s on the same MB (but still 1 GPU per slot), works but in the end all goes to complicated and the entire system easely crashes, and when works all the PCI-e slots works extreamely slow, so the actual performance decrases exponentialy. |
TBar Send message Joined: 22 May 99 Posts: 5204 Credit: 840,779,836 RAC: 2,768 |
This works, 16x PCIe Video Card in 1x PCIe slot, However, you may ruin your board, and you can forget about any warranty afterwards... I speak from personal experience. |
Ianab Send message Joined: 11 Jun 08 Posts: 732 Credit: 20,635,586 RAC: 5 |
There is also this adaptor http://www.ebay.com/itm/PCI-32bits-to-PCI-E-express-16X-riser-card-adapter-/320693561785?pt=LH_DefaultDomain_0&hash=item4aaad369b9 Lets you connect a PCI-e card into an old PCI slot. It means the card only communicates at PCI speed, but for SETI work that's not a fatal problem. If I remember right another cruncher has tried them and found less than 10% performance loss. Of course putting the lid back on the PC may be an issue, but shoe horning 2 cards into one slot is going to cause that sort of issue anyway. Ian |
juan BFP Send message Joined: 16 Mar 07 Posts: 9786 Credit: 572,710,851 RAC: 3,799 |
There is also this adaptor I could confirm, this works i try before, but you made your 16x card run in a 1x slot, and yes not a totaly dissaster if you run SETI but some misterious "hangs" happens when running, never realy find why, all my tests point in the direction of hidden mechanical incompatibilites and/or electric faulty conections (like some spikes in the PCI-e slot due the high frequency), normaly cleared after reboot. If you want to try just keep in mind if your GPU drain power (not all do that) from the PCI-e there is a 75W limit on all devices, or you will literaly "melt" your 12V connectors on your MB. |
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