whoacowboy Posted October 27, 2017 Share Posted October 27, 2017 I have a GA-Z270X-Gaming 9 and I have successfully installed High Sierra with 2GPUs, Titan Xps. (Most) everything is working fine, but enough works for a great rendering machine. I bought 2 more to put it over the top. When I installed all 4 GPUs I get the error "couldn't allocate runtime area" and boot stops. I took one out so there were 3 GPUs and everything works as it did with 2 GPUs. Here is my setup GA-Z270X-Gaming 9 Intel Core i7 6700K 4.00 GHz, Socket LGA 1151 1300W Power supply Samsung 850 EVO 500GB Samsung 850 EVO 1TB CORSAIR DOMINATOR Platinum Series 32GB RAM I am wondering if it could be under powered. I believe the 1300W could be just under, but I should that only be an issue under heavier loads and not on boot? Thanks for your help. Link to comment Share on other sites More sharing options...
mitch_de Posted October 28, 2017 Share Posted October 28, 2017 I am not an expert, but check / calculate the watt consumption on the 12 Volt line of all cards. Even 1300 Watt seems rigth, it can be that the Watts on 12 Volt line are not enough. I think you need at least 800 Watt alone! on the 12 Volt line for 4 highend gpus. 1 Link to comment Share on other sites More sharing options...
whoacowboy Posted October 29, 2017 Author Share Posted October 29, 2017 So i tried using a separate power supply for the forth card and I get the same results, so I am questioning if it is a power issue at all. I am looking into BIOS settings or anything else at this point. Thanks for the help. Link to comment Share on other sites More sharing options...
Guest Posted October 29, 2017 Share Posted October 29, 2017 Have you tried with different aptiofix? (2, free2000 and other?) Have you tried to enable in bios 4g enabled in boot section if you have? In past years I have had two titan Z in my rig (for cpu inside two graphic cards) and it was working with no problem power supply it is not related to memory allocation error I think Link to comment Share on other sites More sharing options...
whoacowboy Posted October 30, 2017 Author Share Posted October 30, 2017 Thanks fabiosun. I am using AptioFix2, but I haven't tried free2000. I will try the new kext and bios setting and get back to you. Link to comment Share on other sites More sharing options...
Guest Posted October 30, 2017 Share Posted October 30, 2017 with aptiofix2 you can try this bootarg slide=xxx xxx=128 xxx=256 and so on Link to comment Share on other sites More sharing options...
whoacowboy Posted November 1, 2017 Author Share Posted November 1, 2017 with aptiofix2 you can try this bootarg slide=xxx xxx=128 xxx=256 and so on What are the numbers 128 and 256 representing? Link to comment Share on other sites More sharing options...
Gigamaxx Posted November 1, 2017 Share Posted November 1, 2017 What are the numbers 128 and 256 representing? XXX= Graphics card Memory Bus Width for the GDDR5x memory. 32 bits per second per processor chip, 128, 256, 512, 1024 bits per second for transfer speeds over the pice lanes. Your Z270 mobo/chipset probably doesn't have enough PCIE lanes to support 4 cards. With one card you probably get 16 pice lanes, 2 cards 8 lanes, 3 cards 4 lanes. etc... Check the lanes in About this Mac in the graphics and displays section. 1 Link to comment Share on other sites More sharing options...
whoacowboy Posted November 1, 2017 Author Share Posted November 1, 2017 Gigabyte says the mobo supports 4 cards at 8x 4-Way & Dual x16 2-Way Multi-Graphics Support • Z270X-Gaming 9 uses the PEX8747 to boost PCIe lanes up to a total of 32 lanes • Supports up to 4-Way SLI & CrossFire configurations • Supports dual x16 for 2-Way SLI & CrossFire configurations So in theory it can handle it. The graphics display says PCIe Lane Width: x8 PCIe Lane Width: x16 PCIe Lane Width: x8 so i imagine that it can support 4 at x8 What slide=xxx what should I set it for 4 titan xps? 1 Link to comment Share on other sites More sharing options...
Guest Posted November 1, 2017 Share Posted November 1, 2017 Gigabyte says the mobo supports 4 cards at 8x 4-Way & Dual x16 2-Way Multi-Graphics Support • Z270X-Gaming 9 uses the PEX8747 to boost PCIe lanes up to a total of 32 lanes • Supports up to 4-Way SLI & CrossFire configurations • Supports dual x16 for 2-Way SLI & CrossFire configurations So in theory it can handle it. The graphics display says PCIe Lane Width: x8 PCIe Lane Width: x16 PCIe Lane Width: x8 so i imagine that it can support 4 at x8 What slide=xxx what should I set it for 4 titan xps? try to increase and see if memory allocation goes away also you can try in your bios to enable 4G decoding option if you have Link to comment Share on other sites More sharing options...
TheRacerMaster Posted November 1, 2017 Share Posted November 1, 2017 XXX= Graphics card Memory Bus Width for the GDDR5x memory. 32 bits per second per processor chip, 128, 256, 512, 1024 bits per second for transfer speeds over the pice lanes. That's not what slide is used for... Link to comment Share on other sites More sharing options...
Gigamaxx Posted November 1, 2017 Share Posted November 1, 2017 That's not what slide is used for... I didnt suggest it, only explained the prior post which proposed the use of it and the values. No idea if it will work. Link to comment Share on other sites More sharing options...
whoacowboy Posted November 2, 2017 Author Share Posted November 2, 2017 It works, woo hoo! fabiosun's suggestion of using OsxAptioFix2Drv-free2000.efi worked. This issues are documented in this article. Link to comment Share on other sites More sharing options...
bbeepp Posted November 12, 2017 Share Posted November 12, 2017 How’s the stablity of the system with 4 GPU’s? Have you tried any rendering benchmarks like Octane bench or some Blender Cycles benchmarks? 1 Link to comment Share on other sites More sharing options...
whoacowboy Posted November 13, 2017 Author Share Posted November 13, 2017 How’s the stablity of the system with 4 GPU’s? Have you tried any rendering benchmarks like Octane bench or some Blender Cycles benchmarks? Sent you a message, but it's pretty stable. Post some link to the benchmarks and I'll run them and post the results. Link to comment Share on other sites More sharing options...
bbeepp Posted November 13, 2017 Share Posted November 13, 2017 Cool, waiting for the results 1 Link to comment Share on other sites More sharing options...
whoacowboy Posted November 13, 2017 Author Share Posted November 13, 2017 Octane version: 3.06.2 Operating system: Mac OS X 10.13.0 64-bit Devices: TITAN Xp, 12 GB TITAN Xp, 12 GB TITAN Xp, 12 GB TITAN Xp, 12 GB Used lower parallel samples: no Total score: 780.772976 Scene, Kernel, Ms/s, GTX980 Ms/s, Ratio, Weight, Score Interior (by Julia Lynen), info channels, 453.312103, 51.52, 8.799, 10, 21.996899 Interior (by Julia Lynen), direct lighting, 145.281067, 17.80, 8.162, 40, 81.618577 Interior (by Julia Lynen), path tracing, 70.538032, 8.54, 8.260, 50, 103.246535 Idea (by Julio Cayetaño), info channels, 733.345873, 85.99, 8.528, 10, 21.320673 Idea (by Julio Cayetaño), direct lighting, 175.109027, 21.05, 8.319, 40, 83.187186 Idea (by Julio Cayetaño), path tracing, 153.909194, 19.38, 7.942, 50, 99.270636 ATV (by Jürgen Aleksejev), info channels, 250.712717, 31.39, 7.987, 10, 19.967563 ATV (by Jürgen Aleksejev), direct lighting, 116.284840, 15.21, 7.645, 40, 76.452886 ATV (by Jürgen Aleksejev), path tracing, 99.720797, 12.92, 7.718, 50, 96.479099 Box (by Enrico Cerica), info channels, 478.849176, 65.75, 7.283, 10, 18.207193 Box (by Enrico Cerica), direct lighting, 96.243913, 13.84, 6.954, 40, 69.540400 Box (by Enrico Cerica), path tracing, 96.286213, 13.45, 7.159, 50, 89.485328 Blender 2.79 Frame:1|Time:02:56.43|Mem:132.45M,Peak: 141.43M 1 Link to comment Share on other sites More sharing options...
bbeepp Posted November 13, 2017 Share Posted November 13, 2017 Cool OctaneBench result! For Blender you need to setup tiles to 480x270. I will be much faster. Check in preferences if all GPU are enabled for rendering. Mine two GTX 980Ti render the BMW benchmark scene in 29 seconds. 1 Link to comment Share on other sites More sharing options...
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