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Need help with RAM on ASUS P9X79 Motherboard and XMP Profile questions

post #1 of 3
Thread Starter 
I'm looking to upgrade my ram on my PC. I have heard that two dimms are more stable than running four dimms. In the ASUS P9X79 LE manual it says the "supported Quality Vendor List" 1600 frequency kits for 16gb are all 4x4 and not any 8x2. Furthermore, according to the ASUS forums Ivy Bridge E overclocking guide, they recommend only 1600 even though 1866 is considered native.

That link is here: http://rog.asus.com/forum/showthread.php?38018-Ivy-Bridge-E-Easy-Overclocking-Guide-%96-The-Listy-Wordy-Edition


System spec:
i7 4930k (want to get stable 4.5+ OC)
Cooler Master V700 PSU
ASUS GTX 680 GPU
ASUS P9X79 LE Motherboard (should I get sabertooth instead? I Just ordered it..)

Recap:

1600 vs 1866, which is better?
Two dimms vs four dimms: does it make a difference for OC potential?
Any additional info regarding the XMP Profile and the QVL (quality vendor list) if you have any information on that.



Thanks a lot!

Sean
post #2 of 3
For price probably 1600, for performance 1866.
I found 4 dimms was always very difficult to get stable high overlcocks. 2 dimms is still preferred.
QVL can be outdated quickly and usually are as the old memory on the QVL list gets discontinued. XMP is nice if they are programmed onto the memory allowing you to change timings and speeds easier.
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Skylake Is Here!
(17 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7 6700K Batch #L535B021 4.7Ghz @ 1.296V GIGABYTE G1 Gaming GA-Z170X-Gaming 7 EVGA Geforce GTX 970 SSC ACX 2.0+ G.SKILL TridentZ 16GB DDR4 3000 
Hard DriveHard DriveHard DriveCooling
Samsung 950 Pro M.2 512GB  Crucial BX100 250 GB SanDisk SSDPlus 240 GB NZXT Kraken X61  
OSMonitorKeyboardPower
Windows 8.1 & 10 Dell UltraSharp 2913WM 21:9 2560x1080 Ducky Shine 4, CODE WASD, Deck Legend, G710+ EVGA SuperNova G2 850W 
CaseMouseMouse PadAudio
Phanteks Enthoo Evolv ATX Mid-Tower Ducky Secret SteelSeries Fostex Purple Heart TH-X00 
Audio
AKG K553 Pro, Philips SHP9500, Superlux 668B, S... 
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post #3 of 3
Hope you like analogies..............

Consider a memory controller to be a highway, the cars are the data, the speed limit is the memory speed, and the volume of traffic handled is the data throughput.

A 2 lane highway, cars going 60 mph handles the same traffic (data throughput) as a 4 lane highway with the cars going only 30 mph.
To handle more traffic you raise the speed limit on the 2 lane highway to 120 mph and the 4 lane highway to 60 mph,
Both still have handle the same amount of traffic, but which highway will have the most crashes?

So, filling 4 slots lets you run the memory faster than you could with only 2 slots filled. But one of two things will happen as you try to increase speed. Either the memory controller won't be able to handle the speed (of 2 slots) or the memory controller won't be able to handle the data throughput (of 4 slots). Which happens first...depends (on a lot of stuff, but that's a whole other thread....)

So, what does all that mean? It means that there is no hard and fast answer. You'd have to try different sticks in different configurations at different speeds to know the answer.

The Asus QVL list is only memory that has been actually tested by Asus. There are a lot of other brands and configurations that will work just fine that haven't been tested.

For overclockers XMP is useless, as you're going to be setting the voltage and timings manually.
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My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
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