X48 Rampage Formula Preview.

[greg.m]

BIOS 0902 didn't solve the random failures when my memory is running faster than 1200MHz.

It would have been to beautiful to have it stable at 8 X 465MHz, DDR 1239MHz and tRD 6.

I'm going to try to isolate the problem but it won't be easy to know what's causing these random failures.

Give me your exactbios settings to try them and see what happens. I suppose i wont have any problem to run them

[Alien Grey]

Give me your exactbios settings to try them and see what happens. I suppose i wont have any problem to run them

This is the best I can do. All settings and voltages seem to be right but I can't keep it stable in Linx and it randomly fails in Prime95. If I raise one of the voltages a little bit more it fails much quicker.

If you lower your multiplier to 8 you can give it a try.

These are my settings.

Ai Overclock Tuner [Manual]
CPU Ratio Setting [8.0]
FSB Strap to North Bridge [400MHz]
FSB Frequency [465MHz]
PCIE Frequency [100MHz]
DRAM Frequency [1239MHz]
DRAM Command Rate [2N]
DRAM CLK Skew on Channel A/B [Auto]
DRAM TimingControl [Auto]
DRAM Static Read Control [Enabled]
Ai Clock Twister [Moderate]
Ai Transaction Booster [Manual]
Common Performance Level [06]
Pull-In of CH A/B all disabled
CPU Voltage [1.36250V] - What you need for 3.72GHz
CPU PLL Voltage [1.50V]
North Bridge Voltage [1.41V] - 1.39V real
DRAM Voltage [1.90V]
FSB Termination Voltage [1.32V] - 1.22V real
South Bridge Voltage [1.05V] - What you have on Auto
SB 1.5V Voltage [1.50V]
Loadline Calibration [Disabled]
CPU GTL Voltage Reference [0.63X]
NB GTL Voltage Reference [0.67X]
DRAM Controller Voltage REF [Auto]
DRAM Channel A/B Voltage REF [Auto]
CPU Spread Spectrum [Disabled]
PCIE Spread Spectrum [Disabled]
CPU Clock Skew [Delay 200ps]
NB Clock Skew [Delay 100ps]

CPU Ratio Setting [8.0]
C1E Support [Disabled]
CPU TM Function [Enabled]
Vanderpool Technology [Disabled]
Execute Disable Bit [Enabled]
Max CPUID Value Limit [Disabled]
Intel(R) SpeedStep (TM) Tech. [Disabled]-> Not available anymore when CPU Ratio Setting is locked

[greg.m]

This is the best I can do. All settings and voltages seem to be right but I can't keep it stable in Linx and it randomly fails in Prime95. If I raise one of the voltages a little bit more it fails much quicker.

If you lower your multiplier to 8 you can give it a try.

These are my settings.

Ai Overclock Tuner [Manual]
CPU Ratio Setting [8.0]
FSB Strap to North Bridge [400MHz]
FSB Frequency [465MHz]
PCIE Frequency [100MHz]
DRAM Frequency [1239MHz]
DRAM Command Rate [2N]
DRAM CLK Skew on Channel A/B [Auto]
DRAM TimingControl [Auto]
DRAM Static Read Control [Enabled]
Ai Clock Twister [Moderate]
Ai Transaction Booster [Manual]
Common Performance Level [06]
Pull-In of CH A/B all disabled
CPU Voltage [1.36250V] - What you need for 3.72GHz
CPU PLL Voltage [1.50V]
North Bridge Voltage [1.41V] - 1.39V real
DRAM Voltage [1.86V]
FSB Termination Voltage [1.32V] - 1.22V real
South Bridge Voltage [1.05V] - What you have on Auto
SB 1.5V Voltage [1.50V]
Loadline Calibration [Disabled]
CPU GTL Voltage Reference [0.63X]
NB GTL Voltage Reference [0.67X]
DRAM Controller Voltage REF [Auto]
DRAM Channel A/B Voltage REF [Auto]
CPU Spread Spectrum [Disabled]
PCIE Spread Spectrum [Disabled]
CPU Clock Skew [Delay 200ps]
NB Clock Skew [Delay 100ps]

CPU Ratio Setting [8.0]
C1E Support [Disabled]
CPU TM Function [Enabled]
Vanderpool Technology [Disabled]
Execute Disable Bit [Enabled]
Max CPUID Value Limit [Disabled]
Intel(R) SpeedStep (TM) Tech. [Disabled]-> Not available anymore when CPU Ratio Setting is locked

Ill do some memtest and prime blend and see how it goes. Before @ 1266 i couldnt pass memtest. Anyway the best ive found until now is 480fsb@1200. It runs fantastic with only 1.9v - ididnt try anylower. Have you tried to run your cpu with 480fsb?

[greg.m]

If I raise one of the voltages a little bit more it fails much quicker.

[/CODE]

When you raised a little bit some voltages, did you leave the cpu and nb skews as they were @ 200, 100? Because ive strted to thinking that for example 100nbskew might not let you raise your volt. And even the smallest increase causes instability. But maybe im wrong ive to test alittle bit more

[Alien Grey]

When you raised a little bit some voltages, did you leave the cpu and nb skews as they were @ 200, 100? Because ive strted to thinking that for example 100nbskew might not let you raise your volt. And even the smallest increase causes instability. But maybe im wrong ive to test alittle bit more

You can try with only CPU Clock Skew Delay 100ps and NB Clock Skew Normal but I don't think that it is possible.

[Zucker2k]

You can try with only CPU Clock Skew Delay 100ps and NB Clock Skew Normal but I don't think that it is possible.

That worked fine for me for all my overclocks, especially in high fsb situations.

There's a new bios out, 0902. Check the Maximus Formula thread.

[Alien Grey]

That worked fine for me for all my overclocks, especially in high fsb situations.

There's a new bios out, 0902. Check the Maximus Formula thread.

Yeah, we know I posted it here and on the Rampage Formula forum. ASUS released it quickly without fixing the DDR +1200MHz issue to keep the crowd happy.

The problem with the Clock Skews is that it won't let you use any other combination.

With CPU Clock Skew Delay 100ps and NB Clock Skew Normal it isn't possible to let it run with DDR +1200MHz with these 2 X 2 Giga sticks. The problem is you have to use to much voltage on the NB that you create over volting it to force it to run like that.

Using CPU Clock SKew Delay 100ps and NB Clock Skew Delay 100ps let you run it with DDR +1200MHz but you will end up with a system crash trying to run Linx.

You are going to end up to use CPU Clock Skew Delay 200ps and NB Clock Skew 100ps. This seem to be the right settings because it let you run with DDR +1200MHz and the system crashes are gone. The only problem now is the random instabilitys.

What I'm thinking is that a Delay of 100ps on the NB is to much or a difference between the CPU Clock Skew and th NB Clock Skew of 100ps is to much.

This is pure speculation as we don't know what the exact delays in time are and maybe with adjusting these delays in the BIOS the problem could be solved.

[Alien Grey]

When you raised a little bit some voltages, did you leave the cpu and nb skews as they were @ 200, 100? Because ive strted to thinking that for example 100nbskew might not let you raise your volt. And even the smallest increase causes instability. But maybe im wrong ive to test alittle bit more

I fired up MemTest86+ V2.11 again and it failed Test 5 after 4 passes.

I'm running Test 5 alone now because it's the only test that it fails after some time.

I'm currently using 1.90V for DDR 1239MHz and that looks to be solving the problem. I changed it in the BIOS settings that I posted earlier.

I'll let it run for some time to be sure that the Memory is error free before I move back again to Linx.

[kuebk]

I fired up MemTest86+ V2.11 again and it failed Test 5 after 4 passes.

I'm running Test 5 alone now because it's the only test that it fails after some time.

I'm currently using 1.90V for DDR 1239MHz and that looks to be solving the problem. I changed it in the BIOS settings that I posted earlier.

I'll let it run for some time to be sure that the Memory is error free before I move back again to Linx.

I wonder why you keep them so low on voltage, maybe you could try to raise voltage up 2.2v?

[Alien Grey]

I wonder why you keep them so low on voltage, maybe you could try to raise voltage up 2.2v?

I tried it with giving so much voltage but it doesn't matter. It isn't the memory that makes it fail.

[Zucker2k]

I wonder why you keep them so low on voltage, maybe you could try to raise voltage up 2.2v?

From my own experience once again, my G.Skills needed as much as .03 volts more to even boot windows from what I needed to pass memtest. Funny thing is, what I needed to boot into windows (which passed 4x 32m spi) failed instantly in memtest. My recommendation, forget memtest and test in the environment that matters - Windows.