XFX 790i Ultra SLI + DDR3 RAM help

Sobtanian

Sobtanian

Sobtanian

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Joined
20 Apr 2007
Posts
133
Hello :)

I have just assembled my new PC: 790i XFX nforce Ultra SLI + qx9650 CPU + 4x1gb Crucial Ballistix DDR3 2000mhz (9-9-9-28) RAM. I have updated the bios.

Now, theoretically, I should just enable EPP2.0 and get max mhz for the RAM. What I am getting is 1333mhz for the FSB (which is the default for qx9650 I understand?) and 1333mhz for the RAM.
Enabling "expert" settings in the bios and manually setting the frequency to 2000mhz, when I boot the POST screen still shows RAM at 1333mhz. I know there's a limitation with 2000mhz using 4 sticks of RAM (nvidia says the max 4 sticks can work at is 1800mhz) but setting it at 1800mhz doesn't work either, it still reports as 1333mhz.

I wonder if anyone can help?

Thanks

EDIT - CPU-Z shows the RAM SPD info as PC3-10700h (max frequency 667mhz, which it is reporting as the current setting). This is odd as the RAM definitely is PC3-16000
 
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The RAM says 1.9v on it, so I've enabled that manually yes.
I've dropped down to 2 sticks in an 0101 config, and manually set the freq to 2000mhz and the voltage to 1.9. Now, cpu-z shows the RAM frequency to be 1000mhz, with a FSB:RAM ratio of 2:6 (FSB is at 1333mhz). Is this correct now? ie is this what cpu-z should be showing?

EDIT - I forgot to mention, the nVidia control panel can't recognise the RAM vendor nor specs. I wonder if that's got something to do with it all....
 
Yeah that sounds right at that ratio:

1333FSB QDR = 333x4

333x6 = 2000Mhz DDR, or 1000Mhz SDR (CPU-Z reports the SDR)
 
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