F3-12800CL9D-4GBRL + Asus M4A785T-M problem

[arvust]

Hi, I originally bought an Asus M4A785T-M and G.skill F3-12800CL8D-4GBTD, a few months down the track I realised that CPU-Z is showing my RAM only running at a max bandwidth of PC3-10700 (667 MHz).

I discovered that the RAM I bought was not listed to work properly on my motherboard (from your site). So I then went and bought f3-12800CL9D-4GBRL, but CPU-Z still reports that its running at a max bandwidth of PC3-10700 (667 MHz)

I have updated the BIOS, which didn't improve anything.

CPU: AMD Phenom II X2 555

If someone could help that would be greatly appreciated, thank you.

[arvust]

I'm sorry to be a pain in the *** but I could really use some advice asap, if I need to return the 2nd lot of RAM I purchased I need to to it soon.

Thanks.

[wevsspot]

From the main BIOS menu page select "Advanced"

Scroll down to "Memory Clock Mode" and change from [Auto] to [Manual]

You'll now have four options for "Memclock Value" They will be;
[400Mhz] [533Mhz] [667Mhz] [800Mhz]

Select [800Mhz]

Save changes and reboot.

You may also have to manually change your primary memory timings, dram voltage and command rate - but lets see if this works before we move into that area.

[arvust]

Thanks, that worked. but now they are just running at 800MHz.

here's what CPU-Z is reporting: http://i.imgur.com/G7eW3.png
cheers

[wevsspot]

DDR = Double Data Rate = 800x2 = DDR3 1600

You're BIOS is auto detecting weird values for your timings though. You'll have to manually change those because they are ridiculously loose.

Go back to the same place you were at in the BIOS when you changed the Memclock frequency.

The next option down is "Dram Timing Mode" Default it's set to [Auto] Change that to [Both]
Change the following

TCL = 9
TRCD = 9
TRP = 9
TRAS = 24
TRFC0 = 2

Leave everything else on Auto

Scroll a little further down the page and set your Memory Over Voltage. Change from [Auto] to 1.5 - 1.55v

Save changes and exit

[mrcmtl]

Try what wevsspot said with both your kits, except for the Trident, try to set

TCL = 8
TRCD = 8
TRP = 8
TRAS = 24
TRFC0 = 2

If the Trident works, you can return the ripjaws. Use something like MemTest to test for stability.

[arvust]

Hey, TRFC0 gives me these options:

90ns
110ns
160ns
300ns
350ns

ps sorry im such a noob! thanks so much for your help so far!.

[mrcmtl]

Try 110ns to start with. I don't remember the best setting for AM3, I use to play around with AM2 but I guess they are a bit different in tRFC.

[arvust]

That works sweet! have the Ripjaws running at CL9 and the Trident running at CL8.

haven't done a memtest yet but I will, if that goes fine then I guess I can take the ripjaws back and just run with the tirdents at 1600mhz CL8.

Thanks so much for your help! Legends!

[mrcmtl]

You'd better test for stability before returning the kits. MemTest would be best or if you want to use the PC, just use it for a couple of days and see if there are any problems.