Timings Conflict?

[sixtoo]

I just purchased 2x1GB sticks of Corsair XMS2 RAM sticks. Part # is CM2X1024-6400. They have timings of 5-5-5-18 ...

I have another pair of Corsair XMS2 sticks.. 2x1GB also.

They have timings of 5-5-5-12 .. when I put both pairs of sticks into my mobo my computer won't go past my bios screen... what do I do?

Is there a conflict because the timings are different? Is there a way to change them so they are all the same on all 4 sticks?


I have a Asus 650i P5N-E SLI, Vista HP 64 bit.

 

[badge]

PC26400 800 MHz. requires 2.1v., your BIOS will default to 1.8v. In BIOS manually set the RAM voltage to 2.1v. Adjust the timings to 5-5-5-12. Use one DIMM in slot one to get into BIOS and make the proper settings.

 

[sixtoo]

What would voltage settings be under?

 

[badge]

ASUS uses Jumper free configuration to place a lot of performance tweaks. Perhaps under that or CPU or Northbridge. Your MB manual should have a description for RAM voltage adjustment in the 'BIOS' section.

 

[sixtoo]

 

[sixtoo]

 

[sixtoo]

I changed the voltage in the jumperfree config you mentioned, to 2.1 something volts. And I changed the timings to 5-5-5-12.. did I do it right lol?

 

[Zorg]

I would be concerned driving RAM with a SPD voltage of 1.8 V at 2.1V.

Post the SPD tab of each stick type.

 

[sixtoo]

Here are the settings that I have in BIOS:

TCL - 5
TRCD - 5
TRP - 5
TRAS - 12

The voltage for the RAM is 2.178V


Screenshots of SPD for the 4 slots:

 

[sixtoo]

My computer has been running perfectly for the last 30 mins now with the 2.1V settings, and the 5-5-5-12 timings.

I don't understand why CPU-Z shows that the Voltage is 1.8V when in the BIOS it is clearly set at 2.178V.. I double checked if I saved the settings in BIOS and I have.. so it something with CPU-Z or..

 

[MapAid]

"There is no conflict" -Darth Vader

CPU-Z shows only spd info, not real ram voltage.
Those spd values refer to jedec standards 5-5-5-18 @1.8v.
However corsair has tested and certified these sticks to run 5-5-5-12 and 2.1v.
More voltage is obviously needed for tighter timings.

 

[Zorg]

"There is no conflict" -Darth Vader

CPU-Z shows only spd info, not real ram voltage.
Those spd values refer to jedec standards 5-5-5-18 @1.8v.
However corsair has tested and certified these sticks to run 5-5-5-12 and 2.1v.
More voltage is obviously needed for tighter timings.

Yes, that is the SPD tab showing what Corsair has programmed into the information portion of the stick of RAM.

There is no JEDEC standard for a speed DDR2 800, that I know of.

At any rate, I checked at Corsair in regard to the CM2X1024-6400 and the information in the link gives their position on the specifications.

CM2X1024- 6400

Each module is tested in an Intel-based motherboard at 800MHz

Tested at the low latencies of (5-5-5-18) at 1.9V

SPD programmed at 5-5-5-18 values

Darth uh... er... I mean sixtoo, I suggest that you try to run these sticks at 1.9V and 5-5-5-18. If that fails go up one volt at a time not exceeding 2.1V. If you want, you could try running them at 5-5-5-15 the real world difference with the core 2 duo is negligible. All of your sticks are identical based on the part number, of course there is never a guaranty. With 4 sticks the voltage may need to be higher than spec due to the additional load of the extra two sticks.

 

[Zorg]

Those spd values refer to jedec standards 5-5-5-18 @1.8v.

One last thing, not all RAM is only giving the JEDEC standard in the SPD, as you can see from my CPU-Z screen shot. The question is what actual chips are on the modules and can they withstand the tighter timings and the higher voltage required. I can tell you that the Micron D9s on my RAM in the screen shot don't stand up that well and Crucial says they handle it in the SPD. That's why I recommend the lowest voltage that will be stable and not to squeeze every last ounce of performance, that won't even be noticeable, from RAM that might not be designed to handle it.

 

[sixtoo]

Thanks for all your help guys. I finally got everything working perfectly. I am running all 4 sticks at 5-5-5-18 like Zorg suggested. I tried using the 1.9 voltage but my system froze about 3-4 minutes after I started Windows.. changed the voltage to 2.013V and it works like a charm.

 

[Zorg]

You gotta run a voltage that works.

Congratulations

 

[badge]

If you have any further BSOD's, in addition to bumping the RAM voltage a little higher than 2.0v, you may have to increase the Northbridge voltage to 1.4v or slightly higher (not more than 1.5v).