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DDR3-1600MHZ showing as PC3-10700H ?

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October 16, 2011 3:46:05 PM

Hello all,

I just put together the following system:

Processor: AMD PHENOM II X6 1090T BE AM3
Memory: 2X CORSAIR 4GB DDR31600 DIMM XMS
Motherboard: ASUS M4N68T-M V2
SSD: GSkill 120 GB FM25S2S120GBP2 SSD

When I use CPU-Z to view the memory specs, this is what I see:



It seems to only be showing as pc3-10700h (667mhz)

I went into the bios and matched the timing of the memory to the settings - 9x9x9x24, and set overvoltage to 1.65. What am I doing wrong here?
a c 241 } Memory
October 16, 2011 3:58:12 PM

The default for the CPU and motherboard is 1333MHz that is where it is running at. You would have to manually set it to 1600MHZ in BIOS.
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October 16, 2011 4:08:08 PM

thanks for your reply. any idea where I would find that?
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October 16, 2011 5:27:00 PM

I read that, but cant find which setting to change it.
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a c 241 } Memory
October 16, 2011 5:35:18 PM

You change ram settings to manual from auto then you can input speed and timings/latency manually!
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October 16, 2011 5:42:09 PM

I did that, but the only clock settings go up to 800mhz. Nothing for 1600....
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a c 241 } Memory
October 16, 2011 5:46:52 PM

800MHZ (active speed) x 2 = 1600MHz (dual data rate effective speed)
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October 16, 2011 5:49:29 PM

ahhhhhhh. so just set it to 800mhz.
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a b } Memory
October 16, 2011 7:16:15 PM

Yes, set it too 800 MHz. clockspeed. Your RAM is "DDR3" = Double Data Rate, meaning two read or write ops per cycle, so if you set it for 800 MHz. then it runs at 2 times 800 MHz. = 1600 Mhz.

BTW, you read the actual system RAM frequency from the MEMORY tab not the SPD tab. The SPD tab shows the possible speeds and latencies for the particular RAM you have installed.

Most AMD Phenom II CPUs will run good RAM @ 1600 MHz. stable. The X6 Thurban CPUs will often run a little higher RAM frequency than the Deneb X4 CPUs but unfortunatley the higher RAM frequency makes very little diff in sysytem performance because it is not a bottleneck for the system like older DDR/DDR2 RAM was.
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October 16, 2011 9:34:56 PM

Thank you for your response. Looks like I was looking in the right place.

Does this look right to take full advantage of the 1600MHZ DDR3 ram?

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a c 241 } Memory
October 16, 2011 9:37:15 PM

Yes, actually surprising seeing it on 1T command rate with the slower 2T being the default at that speed!
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