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Wrong memory clock GA-Z87N-WIFI and i7-4790K

Joined
Jul 16, 2011
Messages
81
Motherboard
Asus Z97I-Plus
CPU
i7-4790K
Graphics
Zotac GTX 780 3GB @ Dell U2711
Mac
  1. MacBook Air
  2. Mac mini
Classic Mac
Mobile Phone
  1. iOS
Hey guys,

my build contains the three parts


  • i7-4790K - Memory Controller: Dual Channel PC3-12800U DDR3-1600
  • GA-Z87N-WIFI - Memory slots: 2x DDR3, dual PC3-21333U (OC)
  • Corsair Vengeance 16GB, DDR3-1866, CMZ16GX3M2A1866C9

If I'm right, the CPU's "natural" clock would be 1600MHz - however it runs with only 1333MHz (see 1st Attachment).

I can enable something like "Extreme Memory Profile X.M.P." in the BIOS Settings which boosts the Clock to 1866MHz, which is the Memory's maximum frequency and would kinda "overclock" the CPU's Memory Controller (see 2nd - 4th Attachment).

Unfortunately Mac OS won't boot with this setting enabled. It just gets stuck during boot without any error or hint what's wring (see 5th Attachment). I just want to have the memory running with 1600MHz. Anything lower than this is a performance issue of at least 2000 points in Geekbench, which means I could have bought a cheaper CPU.

Hopefully, I'm not the only one around here who has a similar issue.
 

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neilhart

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Motherboard
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Have you updated the BIOS to F5 which is required for your CPU?

Good modding,
neil
 
Joined
Jul 16, 2011
Messages
81
Motherboard
Asus Z97I-Plus
CPU
i7-4790K
Graphics
Zotac GTX 780 3GB @ Dell U2711
Mac
  1. MacBook Air
  2. Mac mini
Classic Mac
Mobile Phone
  1. iOS
Of course, you won't even get into the bios without the new version. Would just beep and turn itself off right after pressing the power button.
 
Joined
Feb 5, 2015
Messages
3
Mac
Classic Mac
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Was this ever resolved? I was looking at the same components and don't see the point of getting the high speed memory if you can't set the xmp.
 
Joined
Jul 16, 2011
Messages
81
Motherboard
Asus Z97I-Plus
CPU
i7-4790K
Graphics
Zotac GTX 780 3GB @ Dell U2711
Mac
  1. MacBook Air
  2. Mac mini
Classic Mac
Mobile Phone
  1. iOS
For Some reason my Fusion Drive stopped working with Yosemite. When i tried to use Clover, I got the fusion drive as well as the memory issue fixed, so.. If you want to struggle around with Clover Configs (pain in the ass) go for it
 
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