iMac (Late 2013) 27" i7 Haswell constant crashing with 32GB RAM

Do your crashes continue if you unplug the USB3 Buffalo HD-GDU3 DriveStation DDR?

In System Information > memory, are all modules reporting OK status?

I would review the small manual that came with your iMac regarding memory. Also, here is a search at Apple for “2013 iMac.” Particularly, the memory specifications document may be informative.

If there is an Apple store within a reasonable distance, you should consider setting an appointment to walk in with your iMac. Not convenient, but at some point of frustration, necessary.

I take it that the first 16GB came from Apple, and not third-party sourced?

I too am having the same issues. This is my first Apple product and am a little disappointed a product right out of the box is not working perfectly. I am running Mavericks which was installed onto a brand new configuration as "shaunumb". Black screen, reboot. I think it has something to do with a video driver but not sure.

We are having the same isues. We bought 2 brand new 27" iMacs (late 2013), upgraded to 32GB ram and they both do the same thing. There is no chance our ram is non-working because I had the same set-up on my older iMac and it was working fine (even on Mavericks).

Processor 3.4 GHz Intel Core i5

Memory 32 GB 1600 MHz DDR3

Graphics NVIDIA GeForce GTX 775M 2048 MB

Software OS X 10.9 (13A603)

Brand new, straight out of the box and it crashes every few hours.

So last night I disconnected my external hard drives along with my Boston Acoustic speaker system from the headphone plug. I then installed the new iTunes update that came out last night. Used the iMac for about an hour with no crash. Reconnected my external hard drives and used it for another 2+ hours with still no crash. I am leaving the speaker system disconnected. We will see.....

I'm having the exact same issues! Setup below:

27-inch, Late 2013

Processor 3.5 GHz Intel Core i7

Graphics NVIDIA GeForce GTX 780M 4096 MB

Software OS X 10.9

Memory 32GB Crucial RAM

I too am a web designer and cannot afford to spending time on trying to make a £3000 brand new machine work! I have already returned RAM another brand of RAM believing it was faulty.... now I am wondering if it was the RAM or is something else?

Hey gyus,

did you read this? https://discussions.apple.com/thread/5500080?answerId=23582522022#23582522022

"The answer to this (and for anyone else that stumbles into the same issue) is the kingston modules you have are not compatible with the late 2013 iMacs, the new iMacs require 1.35v modules rather than 1.5v

We've had several machines with the same issue and didn't realise until contacting Kingston.

The correct modules from Kingston for these machines are:

http://www.kingston.com/us/memory/search/Default.aspx?DeviceType=2&Mfr=APP&Line= iMac%20Intel%20Core%20i5/i7&Model=85755&Description=Kingston_System_Specific_Me m ory_for_APP_iMac_Intel_Core_i5/i7_Apple_-_iMac_Intel_Core_i5/i7_27-inch_%28Late _ 2013%29"

Yeah - initially I used the 1.5v. Apple support chat adviser said it should be fine with that RAM so I assumed it was bad and sent it back.

I am now using 1.35v Crucial RAM and still having issues when 32GB RAM is used.

Whilst it is possible that the new RAM includes a bad stick, it just seems a bit odd that a few people are having the same issue with different brands of ram and only when they use 32GB.

There's a couple of comments over on the Crucial forum boards too.

I wondering if the issue occurs when you use all four dimm slots... if this is the case, does anyone know what the resolution would be (firmware update, hardware replacement etc).

Hi, same problem here with a new late 2013 imac with 32GB of RAM from crucial, part number: CT102464BF160B. This slots meets the criteria for this imac, and have been fully working during 8 months in the previous late 2012 imac (model 13,2).

In the crucial website now there is an other model of RAM (CT4951621) that says "Guaranteed-compatible with the Apple iMac (27-inch, Late 2013)", but the specifications are the same.

Can anyone tell me if there is some wrong in this panic log? Thanks so much.

Anonymous UUID: 316CCD5F-28D4-3447-8552-B1568E904C7C

Sun Nov 10 15:53:56 2013

panic(cpu 2 caller 0xffffff80184dc19e): Kernel trap at 0xffffff80184db078, type 14=page fault, registers:

CR0: 0x000000008001003b, CR2: 0x0000000000000021, CR3: 0x00000001ef02e0be, CR4: 0x00000000001606e0

RAX: 0xffffff80584d26d0, RBX: 0x00000000ffffffff, RCX: 0x00000000022f0000, RDX: 0xffffff8056640a70

RSP: 0xffffff83a7273ed8, RBP: 0xffffff83a7273f10, RSI: 0x0000000000000021, RDI: 0xffffff8056640a70

R8: 0xffffff839c1f5078, R9: 0x0000000000000000, R10: 0xffffff83a7273e20, R11: 0x0000000000000200

R12: 0x0000000000000001, R13: 0x00003d0b9c62121a, R14: 0xffffff8056640a70, R15: 0x0000000000001001

RFL: 0x0000000000010296, RIP: 0xffffff80184db078, CS: 0x0000000000000008, SS: 0x0000000000000010

Fault CR2: 0x0000000000000021, Error code: 0x0000000000000000, Fault CPU: 0x2

Backtrace (CPU 2), Frame : Return Address

0xffffff83a7273b60 : 0xffffff8018422f69

0xffffff83a7273be0 : 0xffffff80184dc19e

0xffffff83a7273db0 : 0xffffff80184f3606

0xffffff83a7273dd0 : 0xffffff80184db078

0xffffff83a7273f10 : 0xffffff80184d0cd5

0xffffff83a7273f30 : 0xffffff7f98d48da7

0xffffff83a7273f70 : 0xffffff7f98d49b2f

0xffffff83a7273fb0 : 0xffffff80184d6aa7

Kernel Extensions in backtrace:

com.apple.kec.pthread(1.0)[619F6A5D-FFA2-3B59-9993-958FD7154B83]@0xffffff7f98d4 5000->0xffffff7f98d4ffff

BSD process name corresponding to current thread: Resolve

Mac OS version:

13A603

Kernel version:

Darwin Kernel Version 13.0.0: Thu Sep 19 22:22:27 PDT 2013; root:xnu-2422.1.72~6/RELEASE_X86_64

Kernel UUID: 1D9369E3-D0A5-31B6-8D16-BFFBBB390393

Kernel slide: 0x0000000018200000

Kernel text base: 0xffffff8018400000

System model name: iMac14,2 (Mac-27ADBB7B4CEE8E61)

System uptime in nanoseconds: 67120077654813

last loaded kext at 57409839568543: com.apple.driver.AppleUSBCDC 4.2.1b2 (addr 0xffffff7f9a9f3000, size 20480)

last unloaded kext at 57494564843085: com.apple.driver.AppleUSBCDC 4.2.1b2 (addr 0xffffff7f9a9f3000, size 16384)

loaded kexts:

com.nvidia.CUDA 1.1.0

com.paceap.kext.pacesupport.snowleopard 5.7.2

com.eltima.SyncMate.kext 0.2.5b15

com.apple.iokit.SCSITaskUserClient 3.6.0

com.apple.driver.AppleBluetoothMultitouch 80.14

com.apple.driver.AudioAUUC 1.60

com.apple.driver.AppleHWSensor 1.9.5d0

com.apple.filesystems.autofs 3.0

com.apple.iokit.IOBluetoothSerialManager 4.2.0f6

com.apple.driver.ApplePlatformEnabler 2.0.9d1

com.apple.driver.AGPM 100.14.11

com.apple.driver.X86PlatformShim 1.0.0

com.apple.driver.AppleMikeyHIDDriver 124

com.apple.driver.AppleHDA 2.5.2fc2

com.apple.driver.AppleUpstreamUserClient 3.5.13

com.apple.iokit.IOUserEthernet 1.0.0d1

com.apple.GeForce 8.1.8

com.apple.driver.AppleSMCLMU 2.0.4d1

com.apple.driver.AppleLPC 1.7.0

com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.2.0f6

com.apple.Dont_Steal_Mac_OS_X 7.0.0

com.apple.driver.AppleHWAccess 1

com.apple.driver.AppleThunderboltIP 1.0.10

com.apple.driver.AppleBacklight 170.3.5

com.apple.driver.AppleMCCSControl 1.1.12

com.apple.driver.AppleMikeyDriver 2.5.2fc2

com.apple.driver.AppleIntelHD5000Graphics 8.1.8

com.apple.driver.AppleIntelFramebufferAzul 8.1.8

com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1

com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1

com.apple.BootCache 35

com.apple.driver.AppleUSBHub 650.4.4

com.apple.driver.XsanFilter 404

com.apple.iokit.IOAHCIBlockStorage 2.4.0

com.apple.driver.AppleSDXC 1.4.0

com.apple.iokit.AppleBCM5701Ethernet 3.6.9b9

com.apple.driver.AirPort.Brcm4360 800.21.45

com.apple.driver.AppleAHCIPort 2.9.5

com.apple.driver.AppleUSBXHCI 650.4.3

com.apple.driver.AppleACPIButtons 2.0

com.apple.driver.AppleRTC 2.0

com.apple.driver.AppleHPET 1.8

com.apple.driver.AppleSMBIOS 2.0

com.apple.driver.AppleACPIEC 2.0

com.apple.driver.AppleAPIC 1.7

com.apple.nke.applicationfirewall 153

com.apple.security.quarantine 3

com.apple.iokit.IOSCSIBlockCommandsDevice 3.6.0

com.apple.iokit.IOUSBMassStorageClass 3.6.0

com.apple.driver.IOBluetoothHIDDriver 4.2.0f6

com.apple.driver.AppleMultitouchDriver 245.13

com.apple.kext.triggers 1.0

com.apple.iokit.IOSCSIArchitectureModelFamily 3.6.0

com.apple.driver.DspFuncLib 2.5.2fc2

com.apple.vecLib.kext 1.0.0

com.apple.iokit.IOAudioFamily 1.9.4fc11

com.apple.kext.OSvKernDSPLib 1.14

com.apple.iokit.IOAcceleratorFamily 98.7.1

com.apple.nvidia.driver.NVDAGK100Hal 8.1.8

com.apple.nvidia.driver.NVDAResman 8.1.8

com.apple.iokit.IOBluetoothFamily 4.2.0f6

com.apple.iokit.IOSerialFamily 10.0.7

com.apple.driver.AppleHDAController 2.5.2fc2

com.apple.iokit.IOHDAFamily 2.5.2fc2

com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.2.0f6

com.apple.driver.X86PlatformPlugin 1.0.0

com.apple.driver.AppleSMC 3.1.6d1

com.apple.driver.IOPlatformPluginFamily 5.5.1d27

com.apple.driver.AppleBacklightExpert 1.0.4

com.apple.driver.AppleSMBusController 1.0.11d1

com.apple.driver.AppleSMBusPCI 1.0.12d1

com.apple.iokit.IOSurface 91

com.apple.iokit.IONDRVSupport 2.3.6

com.apple.iokit.IOAcceleratorFamily2 98.7.1

com.apple.AppleGraphicsDeviceControl 3.4.12

com.apple.iokit.IOGraphicsFamily 2.3.6

com.apple.driver.AppleThunderboltEDMSink 1.2.1

com.apple.driver.AppleUSBHIDKeyboard 170.15

com.apple.driver.AppleHIDKeyboard 170.15

com.apple.iokit.IOUSBHIDDriver 650.4.4

com.apple.driver.AppleUSBMergeNub 650.4.0

com.apple.driver.AppleUSBComposite 650.4.0

com.apple.driver.AppleThunderboltDPOutAdapter 2.5.0

com.apple.driver.AppleThunderboltDPInAdapter 2.5.0

com.apple.driver.AppleThunderboltDPAdapterFamily 2.5.0

com.apple.driver.AppleThunderboltPCIDownAdapter 1.4.0

com.apple.iokit.IOUSBUserClient 650.4.4

com.apple.driver.AppleThunderboltNHI 1.9.2

com.apple.iokit.IOThunderboltFamily 2.8.5

com.apple.iokit.IOEthernetAVBController 1.0.3b3

com.apple.iokit.IO80211Family 600.34

com.apple.driver.mDNSOffloadUserClient 1.0.1b4

com.apple.iokit.IONetworkingFamily 3.2

com.apple.iokit.IOAHCIFamily 2.6.0

com.apple.iokit.IOUSBFamily 650.4.4

com.apple.driver.AppleEFINVRAM 2.0

com.apple.driver.AppleEFIRuntime 2.0

com.apple.iokit.IOHIDFamily 2.0.0

com.apple.iokit.IOSMBusFamily 1.1

com.apple.security.sandbox 278.10

com.apple.kext.AppleMatch 1.0.0d1

com.apple.security.TMSafetyNet 7

com.apple.driver.AppleKeyStore 2

com.apple.driver.DiskImages 371.1

com.apple.iokit.IOStorageFamily 1.9

com.apple.iokit.IOReportFamily 21

com.apple.driver.AppleFDEKeyStore 28.30

com.apple.driver.AppleACPIPlatform 2.0

com.apple.iokit.IOPCIFamily 2.8

com.apple.iokit.IOACPIFamily 1.4

com.apple.kec.corecrypto 1.0

com.apple.kec.pthread 1

Model: iMac14,2, BootROM IM142.0118.B00, 4 processors, Intel Core i7, 3.5 GHz, 32 GB, SMC 2.15f2

Graphics: NVIDIA GeForce GTX 780M, NVIDIA GeForce GTX 780M, PCIe, 4096 MB

Memory Module: BANK 0/DIMM0, 8 GB, DDR3, 1600 MHz, 0x802C, 0x31364B544631473634485A2D314736443120

Memory Module: BANK 1/DIMM0, 8 GB, DDR3, 1600 MHz, 0x802C, 0x31364B544631473634485A2D314736443120

Memory Module: BANK 0/DIMM1, 8 GB, DDR3, 1600 MHz, 0x802C, 0x31364B544631473634485A2D314736443120

Memory Module: BANK 1/DIMM1, 8 GB, DDR3, 1600 MHz, 0x802C, 0x31364B544631473634485A2D314736443120

AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x111), Broadcom BCM43xx 1.0 (6.30.223.154.45)

Bluetooth: Version 4.2.0f6 12982, 3 services, 23 devices, 1 incoming serial ports

Network Service: AirPort, AirPort, en1

Serial ATA Device: APPLE SSD SM0512F, 500,28 GB

USB Device: My Passport 0748

USB Device: BRCM20702 Hub

USB Device: Bluetooth USB Host Controller

USB Device: FaceTime HD Camera (Built-in)

USB Device: Keyboard Hub

USB Device: Apple Keyboard

Thunderbolt Bus: iMac, Apple Inc., 23.10

I have the same problem.

I bought a brand new 27 Imac (late 2013)

After installing 32GB of ram my Imac is very unstable.

Have tried everything before, removing software, hardware etc.

Then run memtest and it gives an error on the last test. (walking ones)

When I test with only 2 modules 16GB no problem whatsoever.

My memory is Corsair CMSO16GX3M2A1600C11

On Amazon this memory is highly recommended from other Mac users.

I have tested every memory module the whole day.

There are no problems when I use max 16GB.

Memtest gives no problems, no more crashes.

But when I max out the system to 32GB I have a very unstable system.

For now I only use 16GB, hopefully there will be an solution soon for this problem.

Such a shame. I have wasted over 3 days (in total probably around 30 hours or so) on this issue (looking for fixes, re-doing work I lost when it crashes).

I spoke to Apple chat support and to be honest, I am not even sure it was a real person... I think it may be some really good Artificial Intelligence (like when you call up... the Artificial intelligence on the phone system is flawless). Anywhoo, after a couple of chats suggesting it was the RAM and that I could try to reset NVRAM, run hardware diagnostics etc etc, I didn't really have a clear answer.

Last night it crashed twice and I got fed up. I called Apple today and it is getting returned. I don't know if the issue is with the 3rd Party vendors making false claims that their RAM is 100% compatible or if it is Apple's issue with some kind of hardware/software bug, but i'm not going to let it continue being my issue!

Once it has been returned, I am going re-order and max it out with Apple's overpriced RAM. Then, Apple have nothing to fall back on as it will be all of their hardware and software. It's such a shame that in the drive to gain a bigger audience, the quality of their proiducts/software is slowly slipping. They would be better off charging more of a premium for some very very high quality stuff (like they used to).