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Intel i7 3930k and Ram

post #1 of 4
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So I'm building up a new system and I want to use the Asus Rampage IV Extreme motherboard. The motherboard says it can support up to 2400 (OC) DDR3 Ram and I found some really nice RipJaws ram. However, reading up on the CPU I want to use (the i7 3930k) some people are saying if you use any ram over 1600 it will fry the cpu because the quad channel controller is rated at 1.5V and 1600.

Now, is there any truth to this? How can a motherboard be rated for 2400 DDR3 but one of the highest end CPU's be rated for 1600? I certainly don't want to fry my 500 some odd dollar CPU
post #2 of 4
You won't fry anything by running the RAM at 2400MHz. There may be problems if you run higher than 1.5v on the motherboard for the RAM.
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The Fox Box
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post #3 of 4
There is no problem trying to run 2400Mhz ram with that set up. You are safe using up to 1.65v for the ram and 1.2v max on the VCSSA(Integrated Memory Controller) IMC.

The problem is, your cpu's IMC might not be able to push 2400MHz speeds on the ram. If that's the caes, just try and run 2133MHz with tighter timings.

If you really want to be safe and save a couple bucks, I'd go for 1.5v 2133MHz ram instead of bying higher priced 2400MHz. 2133MHz ram is probably the most highest speed on average that the 3930k can achieve on average.
    
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post #4 of 4
Quote:
Originally Posted by MrTOOSHORT View Post

There is no problem trying to run 2400Mhz ram with that set up. You are safe using up to 1.65v for the ram and 1.2v max on the VCSSA(Integrated Memory Controller) IMC.
The problem is, your cpu's IMC might not be able to push 2400MHz speeds on the ram. If that's the caes, just try and run 2133MHz with tighter timings.
If you really want to be safe and save a couple bucks, I'd go for 1.5v 2133MHz ram instead of bying higher priced 2400MHz. 2133MHz ram is probably the most highest speed on average that the 3930k can achieve on average.
I tested Patriot 2133 C11 series - and got them to work on 2400 MHz on just one CPU from 3 (3930k) - so all is lottery biggrin.gif
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Studio
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Game I
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Game II
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CPUMotherboardGraphicsRAM
I7 3930k ASUS P9x79 VGA GeForce GTX 770 4GB Dual FTW w/ EVGA ACX Co... HyperX Predator (T2) - 8GB Kit* (2x4GB) - DDR3 ... 
Hard DriveHard DriveHard DriveHard Drive
Mushkin Enhanced Chronos MKNSSDCR240GB 2.5" 240GB Seagate ST2000VX002 WD20EZRX Kingston HyperX 3K SH103S3/240G 2.5" 240GB 
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Optiarc DVD RW AD-7200S SEIDON 240mm Windows 8 ASUS MX279 
MonitorPowerCaseAudio
ASUS MX279 Thermaltake 750W LC Power Infiltrator M-Audio Delta 1010Lt 
Audio
M-Audio FireWire Solo 
CPUMotherboardGraphicsRAM
I7 3930k ASUS P9X79  GV-N670OC-2GD  PXD38G2133C11K 
Hard DriveCoolingOSMonitor
Corsair Force 3 Noktua NH D14 Windows 8 ASUS VE278Q 
PowerCase
SeaSonic X750 Gold 750W  Cooler Master HAF 922 
CPUMotherboardGraphicsGraphics
I7 3930k ASUS P9X79 MSI N670GTX-PM2D2GD5/OC MSI N670GTX-PM2D2GD5/OC 
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PXD38G2133C11K Corsair Force 3 Noktua NH D14 Windows 8 
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