Asus M4N72-D/F2-9600CL5-2GBTD

[Lordred]

Asus M4N72-D
G. Skill F2-9600CL5-2GBTD x2
AMD Phenom II X6 1055T


I recently bought this G. Skill ram from a private party, he had been using them on a Intel motherboard and was able to run these sticks at 1200mhz as advertised, according to Asus the M4N72-D can handle up to DDR2 OC 1300mhz

My problem is the best I can manage is to run them at 1066mhz 5-5-5-15 1.9v

I have tried running them at 2.1v raising my FSB to get them up to 1200, doing this my computer fails to post, when I set timings to run [auto] I am able to boot up with the ram at 1066 5-7-7-18 1.8v it will run rock solid like that.

Now on the other hand I can run the G.skill at 1:2 4-4-4-12 1.8v with my FSB at 240, resulting in 960mhz for the ram. Runs rock solid at these speeds.

The only other thing I can think of is my mobo detects these sticks as PC2-6400 rather then PC2-9600.

Lastly under CPU-ID the 1066 rate lists a tRC of 48, however when in 1066 mode the highest bank cycle time my motherboard allows is 41.

So I'm just scratching my head there has to be something simple I'm overlooking.

Thanks in advance.

[Tradesman]

Might want to set the timings, speed, DRAM voltage all manually to spec, and will prob want to raise your CPU and MC voltages

[GSKILL TECH]

What is you NB Frequency? Try x11 2200MHz. Also, increasing CPU-NB Voltage +0.1V may help. You should be able to work your way up to near DDR2-1200.

The mobo will detect PC2-6400 for ANY memory since this is the JEDEC standard, maximum default, without utilizing an EPP/XMP Profile.

tRC is 48 max, 41 should be fine.

Keep us posted on the results.

Thank you
GSKILL TECH

[Lordred]

What is you NB Frequency?

With no OC, Ive been running the motherboard NB at x10 (2000mhz)
When I set the ram to 1066, 5-5-5-18 TRC 41 I am able to boot at 1.8V into windows, compleatly stable, if I bump the FSB 1mhz, I fail to post and have to reset Cmos

(Ram/NB/HT)
Ram 1.8v/NB 1.3v/ HT 1.2v
When I set the ram to 800, 4-4-4-12 TRC 20 1.8v I am stable with the FSB at 240 (960/2400/2400). at 5-5-5-18 TRC 34 I am stable up to 260 (1040/2340/2340)

Try x11 2200MHz.

Northbridge and HT are capped at x10 on non-Black Edition AMD's

Also, increasing CPU-NB Voltage +0.1V may help

CPU-NB was at 1.4v during attempts at 1200mhz, but turned back to auto after POST failurs

If it makes a difference for northbridge stability I also have two video cards in SLI which also adds load to the NB

[GSKILL TECH]

Do you have the latest BIOS for the motherboard? You should be able to adjust NB Frequency with the 1055T. Without this, I don't think memory frequency will go much higher.

Thank you
GSKILL TECH

[Lordred]

I am using the latest bios from Asus 2201 (a beta bios)

Northbridge speeds are adjustable from x10 down, but I cannot go above x10, with my Phenom II X2 550be both northbridge and HT are unlocked.

Are you recomending I drop my northbridge speed to reach 1200? or saying I need to beable to increase the multi to reach 1200.

I could try droping the X2 back in for testing if thats what you are driving at.

[GSKILL TECH]

What I mean is you need to be able to increase the NB Frequency to reach DDR2-1200.

First you said you have the AMD Phenom II X6 1055T, then you said non-BE editions are locked, which of course I know, now you're telling me your 550BE is unlocked.. well if so.. increase NB Frequency to x11 2200MHz and CPU-NB Voltage +0.1V and that should provide better results.

Thank you
GSKILL SUPPORT