Gigabyte GA-MA790FXT-UDP5 & G.Skill F3-12800CL7D-4GBRH - UPDATE

[Stu ST200]

What processor do you have?

Stu

[tmas3]

Phenom II X3 720

Well I have it running just fine at 8-8-8-24 @1600 with default 1.6v. Would 7-7-7-24 be that big of a difference in performance?

[Stu ST200]

Well the issue was for me dropping it from CL8 or CL9 to CL7, with the previous bios it just wouldn't have it whether it be using 1.60v or 1.65v it made no difference, so I was forced to run 8-7-7-24 which it would do ok at 1600Mhz.

I don't know what to say really, if you have the latest bios it should work at 7-7-7-24 @ 1600Mhz but only if you have upped the VDIMM to 1.65v from 1.60v, it won't boot on mine with only 1.60V to the RAM, so make sure you have done that.

Did you load optimal setting in the bios when you entered if after flashing it to the latest one or did you leave it as it was and only change the memory settings and timings?

Stu

[tmas3]

Did you load optimal setting in the bios

That fixed it! The trick was clicking optimal settings before I made the changes. Running at 7-7-7-24@1600Mhz just fine now. One thing I noticed is the DRAM frequency supposed to be 670MHz? I think it was 800Mhz @ 8-7-7-24. Take a look...



Everything look fine?

[Stu ST200]

Unfortunately no, your DRAM Frequency is too low, it needs to be at 800Mhz for you to be running at 1600Mhz overall, your currently at 1333mhz ... you need to go back into your bios and change your RAM from 6.66x to 8.00x, that will then have you running ay 1600Mhz.

Also make sure you set the voltage to 1.65v, however your timings all look good, if you can boot once you have done that above then your all good at 1600Mhz.

Stu

[tmas3]

Damn it wouldnt boot when set to 1600Mhz manually. I must be setting the wrong voltage. Just to be clear which voltage do you choose?

DDR3 Voltage

0.0.50+
0.1.00+
0.1.50+

I've been picking the first option is that the right one? Didnt want to risk trying a higher one.

[Stu ST200]

Yeah you only want to increase the RAM by 0.05v which is the first one, once you have picked this it states the corrected voltage at the side of it.

Stu

[tmas3]

Oh well I guess Ill leave it at 8-8-8-24 1600Mhz

[Stu ST200]

Oh well I guess Ill leave it at 8-8-8-24 1600Mhz

You might be able to run 8-7-7-24-2T ... try that one however I think 7-7-7-24-1T @ 1333Mhz would give better performance as the Phenom prefer tighter timings over clock speed (obviously 7-7-7-24-2T @ 1600Mhz would be even better but your having issues with that).

Try them both and run Super PI a few times, the 1Mb test and see which result is faster, its a nice little memory benchmarker.

Stu