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4.5ghz, cant get stable with my 1600 ram, only at 1333

post #1 of 18
Thread Starter 
So here are my screens.
4.5ghz at b/w 1.328 and 1.336
My memory is 8gb corsair vengeance 1600 cl9 1.5v (2 x 4gb)

I can get 20 pass IBT stable, hitting no more than 74 degrees, but only if the ram is at 1333. If I put it to 1600 which is its stock speed, I fail the 2nd pass of IBT every time. I tried messing with VCCIO and got as high as 1.11, but it still failed at the 2nd pass every time. What should I begin to look at now? Also, are those voltages decent for 4.5? Idle, my voltages are b/w 1.352 and 1.360.

My next question- I am using manual voltage, but I have apparently (barring unforseen errors in my p95 test later on) found a stable multi/voltage combo. Essentially, can I transfer this multi/voltage combo over to offset? What else will I have to change to keep it stable? Any help is as always appreciated.

450

450

450

450

450


Is an increase in ram voltage what it needs, although it would be running the rated speed?

Edit: I noticed something unrelated but weird while benchmarking this speed earlier. CPU-Z, Real temp, Aida all show the correct frequencies of my overclock. However, when I run unigine or any of the futuremark benches, they just see "3.4ghz". Are the utilizing the correct speed during the benches? The reason I worry is because from stock speeds to 4.5, unigine only raised 20 points, unless of course its just be being nit-picky and unigine isn't very CPU intensive as I think?
Edited by guitarmageddon88 - 12/28/11 at 8:02pm
post #2 of 18
Set the Ai Clock tuner to XMP

Disable Internal PLL overvoltage

Leave the entire 'Turbo Mode Parameters' page on Auto

Now try running IBT and report back. thumb.gif

GPU benchmarking is just that and is hardly cpu intensive.
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post #3 of 18
Quote:
Originally Posted by guitarmageddon88 View Post

My next question- I am using manual voltage, but I have apparently (barring unforseen errors in my p95 test later on) found a stable multi/voltage combo. Essentially, can I transfer this multi/voltage combo over to offset? What else will I have to change to keep it stable? Any help is as always appreciated.

Manual Voltage = C3/C6 States need to be set to "Auto" or "Enabled". It may vary on which one.

Offset Voltage = C3/C6 States need to be set to "Disabled".

When doing this just set the offset to like -.05 and see what that voltage is under load & work from there. I believe offset "predetermines" your voltage depending on certain factors in your overclock, so once you know what that value is you can work off of it and "offset" that voltage. Make sure your LLC setting is set to "Ultra High". I run a +.15 offset voltage for my 5GHz overclock.

That should answer that question. Also you may want to reduce PLL voltage from the stock 1.8v because usually that value is too high. I run mine at 1.45v but it may vary in each case to what your able to run it at.
Edited by iinversion - 12/28/11 at 9:28pm
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post #4 of 18
Quote:
Originally Posted by iinversion View Post

When doing this just set the offset to like -.05 and see what that voltage is under load & work from there. I believe offset "predetermines" your voltage depending on certain factors in your overclock, so once you know what that value is you can work off of it and "offset" that voltage. Make sure your LLC setting is set to "Ultra High". I run a +.15 offset voltage for my 5GHz overclock.

That should answer that question. Also you may want to reduce PLL voltage from the stock 1.8v because usually that value is too high. I run mine at 1.45v but it may vary in each case to what your able to run it at.

1.45v?? damn that's low lol Mine doesn't boot until I hit 1.5v, got it sitting at 1.5875v comfortably lol

Just to add on the offset, work with manual voltage first until you determine the right voltage for your overclock then you can switch to offset. Here's how it works:

Leave voltage on manual and read the load voltage with cpu-z (example - 1.344v needed for your overclock)
At the same time read the VID under load with Realtemp (reads 1.3511v)

Now the offset required in that instance would be a negative value from the VID to obtain the load voltage you need, it would be roughly -0.005v (1.3511 - 0.005 = 1.346v). Just a note, 0.005v might cause your load voltage to drop lower than 1.346, in that case try using a positive offset of +0.005.

There you have it, that's how offset works. Report back and let us know how you get on.
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post #5 of 18
A somewhat educated guess here: If the system is only stable when the RAM is at 1333, why not increase the uncore voltage, then speed it up to 1600? Or really anything thats related to the memory controller.

If anyone has any reason as to why I might be wrong, please do correct me smile.gif
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post #6 of 18
Thread Starter 
Quote:
Originally Posted by munaim1 View Post

Set the Ai Clock tuner to XMP
Disable Internal PLL overvoltage
Leave the entire 'Turbo Mode Parameters' page on Auto
Now try running IBT and report back. thumb.gif
GPU benchmarking is just that and is hardly cpu intensive.

Sadly, the same result with these settings. Regardless, should I leave it with the xmp option selected?
Quote:
Originally Posted by shinigamibob View Post

A somewhat educated guess here: If the system is only stable when the RAM is at 1333, why not increase the uncore voltage, then speed it up to 1600? Or really anything thats related to the memory controller.
If anyone has any reason as to why I might be wrong, please do correct me smile.gif

Should I start lowering vccio more or raising the cpu volts first?
post #7 of 18
if you want to set your ram to 1600 youre going to have to adjust the ram timings to get it stable.

check to see your ram's timing from the MFG's website to get you started on where you need to go and then adjust accordingly in your bios.
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post #8 of 18
Thread Starter 
Quote:
Originally Posted by subliminally incorrect View Post

if you want to set your ram to 1600 youre going to have to adjust the ram timings to get it stable.
check to see your ram's timing from the MFG's website to get you started on where you need to go and then adjust accordingly in your bios.

I am currrently using the xmp (9 9 9 24 2t) which is what failed again on IBT. In the 1333 tests that passed IBT, I was using 9 9 9 24 1t just because it defaulted at 1t so i left it there. Voltages of one bump above 1.5 at 1.506 i think it was, (just because I like to play it safe). Should I have to loosen these timings even though its xmp?
post #9 of 18
Quote:
Originally Posted by guitarmageddon88 View Post

Quote:
Originally Posted by subliminally incorrect View Post

if you want to set your ram to 1600 youre going to have to adjust the ram timings to get it stable.
check to see your ram's timing from the MFG's website to get you started on where you need to go and then adjust accordingly in your bios.

I am currrently using the xmp (9 9 9 24 2t) which is what failed again on IBT. In the 1333 tests that passed IBT, I was using 9 9 9 24 1t just because it defaulted at 1t so i left it there. Voltages of one bump above 1.5 at 1.506 i think it was, (just because I like to play it safe). Should I have to loosen these timings even though its xmp?

Have you tried running Memtest for a few hours just to see whether or not your RAM is faulty?

Try increasing the VCCIO upto 1.15v (small increments) and see if that helps.
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post #10 of 18
Thread Starter 
Quote:
Originally Posted by munaim1 View Post

Have you tried running Memtest for a few hours just to see whether or not your RAM is faulty?
Try increasing the VCCIO upto 1.15v (small increments) and see if that helps.

Should I run memtest at those 1333 speeds or the rated xmp settings?
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