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QPI/Dram Voltage

post #1 of 4
Thread Starter 
Hey Guys,

There are ALOT of threads out there regarding QPI volts.

I have recetly upgraded my system to:

Rampage 3 Extreme
i7 920 D0
2000Mhz Dom Gt's 8-9-8-24
Custom W/C (EK-supreme)
1250W Coolermaster PSU

Now my CPU is stable at 21X190 with 1.35 qpi but that makes my RAM run at 1904 mhz

If I try 21X200 with 1.35 it wont boot

Now if i run my ram at 1600mhz and 21X200 with 1.35 qpi then it boots

So can I ramp up my qpi to like 1.5 to get my ram to run at 21x200 and ram at 2000mhz is this safe?

Oh and the reason im only useing 21X is coz my 20X isnt stable

Thanks Guys

Mikrouwel
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i7 930 @ 4.2ghz @ 1.275vcore Rampage 3 Extreme Asus 6950 DCUII Asus 6950 DCUII 
RAMHard DriveOptical DriveOS
2000mhz Dom Gt's cl8 (3 Internal) 2 x 250GIG Samsung 7200RPM, 1 x 2TB W LG DVD-RW Windows 7 64bit 
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SyncMaster P2250 (1920x1080) Razer Nostromo Coolermaster 1250W Cosmos II 
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post #2 of 4
Quote:
So can I ramp up my qpi to like 1.5
NO
Quote:
Now my CPU is stable at 21X190 with 1.35 qpi but that makes my RAM run at 1904 mhz
> lower your ram speed !
Tropical Blend
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Tropical Blend
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60gb OCZ Agility ssd + 3 hdd 2 X Laing ddc 1+ T / 360 Phobya + 240 TFC p&p Seven Ultimate 64 Viewsonic 28" 
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post #3 of 4
Yeah, just go to RAM frequency setting and select an option closer to your stock speed. If 2000 is your clock speed then okay... maybe a little extra qpi juice is in order but not 1.35 up to 1.5. That's a lot of sauce, man.

Obviously if you've brought your frequency down and it works, and raise it and it crashes... RAM is your issue. If it were me, I'd put more juice on the qpi with one hit of the plus key in the bios... that'll bump it up to it's next setting- increments of 0.0125 or whatever.

But don't jump up 0.15. That'd be like using a nuclear power plant to power an LED christmas light setup.

I'm not sure I agree with lowering your RAM speed either- if your stock speed is 2000mhz then great. Might as well run at stock.

PS: What voltage are you running to your core? If your multiplier is unstable usually it's because of a lack of power. Bclock is the less efficient way of overclocking because it ends up affecting so many more things down the line- (like RAM, as you've noticed)
Edited by Eno75 - 12/27/10 at 8:51am
DireWolf
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DireWolf
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post #4 of 4
you can saflty take qpi/vtt north of 1.45v with adequate cooling and make sure vdram is within .5v of qpi/vtt I have used over 1.55v upto 1.6v, and had no damage, I woudl say 1.45v is max safe 24/7. BTW you have a VERY nice chip if you can do 1900mhz ram at ONLY 1.35vtt.
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X99 Main Rig
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