![]() Eventually you may end up with a working system with multiple GPUs connected to the motherboard via splitters and extenders.ĭon't forget to have an adequate supply of coffee to hand. As you rightly imply, it takes a lot of time to go through all the combinations. First make sure all the components work well "on their own" - for GPUs that means only one plugged in directly, checking each one in turn in a given slot without an extender in place then check each one on its own on several extenders (this should weed out a few of the problematic extenders) now try each GPU in turn singly on a splitter, and so on. The whole subject is a real pain and is well outside the scope of BOINC to even consider managing - indeed as you suggest it is an issue that resides somewhere in the infernal triangle of: BIOSes, operating system and GPU drivers :-( The motherboard memory addressing by GPUs is not a simple xGb on GPU = xGb on motherboard - there are a whole pile of other things that get in the way, including, but not limited to: how the PCIe bus is mapped onto the physical memory at both ends of the link, driver mapping, data compression, what else is going on, GPU hardware & BIOS etc. Surely if I have two 4GB cards, the address space goes up to 8GB? The 4G BIOS option, is only if you have GPUs with higher than 4GB VRAM.įor 4GB and below (even if you run 10), you don't need to enable the option. I do have one GPU that's annoying me more often, I'm currently swapping things around to see if I can isolate what the problem is. If you can't even boot into BIOS with 2 GPUs, try swapping out one of the GPUs with a spare older one you may or may not have lying around.Ī GT710 is a rather poor GPU, but a GT730 (with DDR3) is a good GPU for regular day to day activities, that only costs like $25-50 on the second hand market. If your BIOS supports it, you can see if the GPUs are recognized, what slots they populate and what the slot speed is (x4/x8/x16), what PCIE speeds they run on (PCIE 2.0/3.0/.). ![]() On some boards you first need to set the "Above 4g decoding" option, if your GPU has more than 4GB of VRAM. You might also need to go into the Bios to see if the right speeds (PCIE 2.0 or 3.0) are selected, and if you need to enable a second GPU slot or not. If I were you, I'd try to install the GPUs without risers on the motherboard, just to see if the motherboard accepts it like that (to rule out any bad risers). They have much better cable mounting, and can withstand much better torquing and flexing.įor basic mounting a GPU and never touching it, the regular grey ones (with parallel ribbons) are good enough. Once you get more than 20cm ~8in, you need shielded risers. Probably bad contact points.Īnd possibly 1 more with some errors that could have a variety of reasons non-PCIE related, but I just threw it away anyway, and installed a new one. I've had 1 or 2 bad ones out of a good 10, one of them was because I had bent the cable and the solder joints came off, one of them had worn contact pins from swapping GPUs too much (over 20 swaps) and only ran at x4 or x2 speeds. They're good enough for up to 20cm and never really failed me. The ones where 2 ribbons are in parallel with one another. If your devices are running hot, and you can't add cooling, you can reduce heat by limiting the amount of CPU BOINC is permitted to use.I've ran multiple RTX 2080Tis on PCIE 3.0 with cheap x16 risers for many years, and for the most part they run without problems.īut when I do run them, I make sure I get the 'double ribbon' x16 risers. ![]() You run the risk of seriously damaging the components, or even starting a fire. I think if you want to seriously run a multi GPU setup you just need to invest in newer hardware. You just need the right platform to begin with. ✻ Smokey says: avoid excessive personal grooming to fight climate change! Be smart with your electronics, never operate them with inadequate ventilation. I don’t have any experience running multiple AMD GPUs for BOINC, but I had a machine running 8x RX 570s mining a few years ago. Users can decide which projects they participate in, using the free and open-source BOINC client software. A subreddit dedicated to all things BOINC, a platform enabling the public to volunteer their computer's processing capability towards research projects distributed across the globe. ![]()
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