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Oc i5 760 and my 1600mhz ram

post #1 of 5
Thread Starter 
Ive done hrs of reading and I see that most people oc'ing seem to have their ram at 2000mhz.

Since I have 2x4gb 1600 mhz corsair Vengeance 8-8-8-24 ram, what are the max settings I can expect for bus speed? I have it at 160mhz now and any higher was not stable in prime95. (I didnt however increase ram voltage).

Not stable at Bus 170 or 200mhz bus...

After all my reading Im still not clear on how the ram I have will affect my max bus speed...

Ive attached a pic of my mild OC that was stable in prime for 6 hrs with a max temp of 49C.

Thanks for anyone who can help or dirrect me to any good links.
Note: My knowledge is not high since I have not OC'ed since my Pentium 450mhz.

HW:
P7P55 LX
GTX 460
i5 760
2x4gb 1600 mhz corsair Vengeance 8-8-8-24 ram
Thermalright MUX-120 Cooling

Edited by BatFastard - 3/19/11 at 10:40am
post #2 of 5
I really doubt you'll be able to OC your RAM that far. For now, keep it at stock settings and just OC the CPU, hen come back and try OCing the RAM afterwards.

When you say you've tried increasing the bus and lost stability, have you changes the voltages or lowered the multipliers on your CPU and RAM, since you'll need to do that if you want to find your max stable bus.
    
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post #3 of 5
Thread Starter 
The only voltage I changed was cpu to 1.25.

I reduced the cpu multi to stock and tried 200 then 170 bus with no voltage increase besides the cpu at 1.25. Ive kept my stock ram voltage at 1.5v.

So should I reduce my multiplyer all the way, increase ram volts and try to slowly increase ram speed(bus speed)?

What Im not clear on is if I increase bus speed to say 180, should I also increase my dram frequency?
Edited by BatFastard - 3/19/11 at 10:54am
post #4 of 5
your bus speed is multipied by multipliers to create clock speeds. So leaving the CPU multiplier at stock and increasing the baseclock will still create an overclock.

The RAM multiplier is the same.

To keep those at stock speeds, you need to reduce the multipliers.

I would also recommend setting most of your voltages to stock but you will probably want to fiddle with the VTT or northbridge voltage, I have heard people find it can become unstable with minor increases, but that's not something I have experienced, a good starting point for that would also be about 1.25v imo.

What settings do you have for the QPI speed btw?
    
CPUMotherboardGraphicsRAM
e5645 @ 4.2Ghz P6X58D-E 5450 x2 6Gb Corsair Dominator 1600 
CoolingOSPowerCase
ALPENFOHN K2 Windows 7 Pro Antec Truepower Trio 650W Dell Optiplex 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
e5645 @ 4.2Ghz P6X58D-E 5450 x2 6Gb Corsair Dominator 1600 
CoolingOSPowerCase
ALPENFOHN K2 Windows 7 Pro Antec Truepower Trio 650W Dell Optiplex 
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post #5 of 5
Thread Starter 
Quote:
Originally Posted by Crabid View Post
What settings do you have for the QPI speed btw?
They must be at stock... I find this very confusing since different terminology is used for the same things in many tutorials.

"QPI Frequency: Anything over 150-160MHz base clock, select the lower multiplier. It does not affect performance, but it is also connected to the base clock and will potentially limit the total overclock."

So the QPI freqency is a multiplier for ram to baseclock?
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