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Issue with my Corsair Vengeance on a 990FXA-UD3

post #1 of 7
Thread Starter 
Hi guys!

This weekend i was doing some OC to my PII X3 720 BE, and doing so i noticed in the BIOS that my pair of Corsair Vengeance sticks (2x4gb) were being clocked at 1333mhz instead of their factory clock of 1600mhz.

When i change the multiplier from 6.66 to 8 (x 200mhz) to reach 1600mhz, my computer won't boot, the motherboard makes a long beep, restarts and clocks it back to 1333mhz.

I've tried everything, setting the timings manually, bumping the voltage to 1.60v and 1.65v, increasing the CPU NB VID to 1.10, 1.20 and 1.30, relaxed the timings, changed the stick to the other slots, enabiling E.O.C.P to DDR31600 profile, even rolled back the overclock on my CPU just to test, and nothing worked.

I don't know if i forgot something, or im doing it wrong. Maybe the IMC of my PII can't manage anything above 1333mhz, but i've seen people getting 1600mhz and higher with their Phenom's.

I would appreciate any help you can give me
post #2 of 7
Quote:
Originally Posted by seijuro View Post

Hi guys!
This weekend i was doing some OC to my PII X3 720 BE, and doing so i noticed in the BIOS that my pair of Corsair Vengeance sticks (2x4gb) were being clocked at 1333mhz instead of their factory clock of 1600mhz.
When i change the multiplier from 6.66 to 8 (x 200mhz) to reach 1600mhz, my computer won't boot, the motherboard makes a long beep, restarts and clocks it back to 1333mhz.
I've tried everything, setting the timings manually, bumping the voltage to 1.60v and 1.65v, increasing the CPU NB VID to 1.10, 1.20 and 1.30, relaxed the timings, changed the stick to the other slots, enabiling E.O.C.P to DDR31600 profile, even rolled back the overclock on my CPU just to test, and nothing worked.
I don't know if i forgot something, or im doing it wrong. Maybe the IMC of my PII can't manage anything above 1333mhz, but i've seen people getting 1600mhz and higher with their Phenom's.
I would appreciate any help you can give me
i think your cpu uses c2 stepping so it can only support 1333mhz. im not sure because i dont have the cpu in front of me though. i would download cpu-z and see if it says it is c2 stepping, and if it is, that is the problem.
post #3 of 7
Thread Starter 
Quote:
Originally Posted by thepoopscooper View Post

i think your cpu uses c2 stepping so it can only support 1333mhz. im not sure because i dont have the cpu in front of me though. i would download cpu-z and see if it says it is c2 stepping, and if it is, that is the problem.

That sounds pretty bad. I'll post a CPU-z screenshot later because i'm at work right now...

If that is the problem, it means that i couldn't push them via FSB neither?
post #4 of 7
Thread Starter 
Quote:
Originally Posted by thepoopscooper View Post

i think your cpu uses c2 stepping so it can only support 1333mhz. im not sure because i dont have the cpu in front of me though. i would download cpu-z and see if it says it is c2 stepping, and if it is, that is the problem.

Yep, i've checked and my X3 is C2 stepping...
post #5 of 7
yeah you cant overclock it anything past 1333mhz. it's a shame, but there isnt really anything you can do about it... frown.gif
post #6 of 7
Thread Starter 
I'll have to wait until Vishera is launched then... thanks for your help mate!
post #7 of 7

2 DIMMs can do 1600Mhz on a C2 revision.
Check your secondary timings - particularly the tRFC.  And for the record, all Phenom II x3 CPUs are C2 stepping.

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