CPU-Z says ram is at 872mhz?

[whop1]

In the BIOS it says I am running at 1800 mhz but in cpu-z it says 872?

Is cpu-z wrong or is my memory running extremely low?

 

[JonBeam]

Not as low as you think..but still low...it should read 900. (double data rate)

 

[jsc]

Right. The BIOS will report the memory clock. CPUZ reports the memory frequency.

Using an Intel E8400 and DDR2 RAM as an example:
the FSB frequency is 333 MHz. The matching DDR2 memory clock for that frequency is 667 MHz (333 X 2). Each bus cycle generates two memory clocks. DDR2 memory transfers two chunks of data for each bus cycle, hence double the frequency.

 

[galeener]

Its running at 1744 have you set your timings manually in bios.
Also what chipset are you running 1366,1155.1156 ? Which mother board?
Also if you have any power saving features on the memory may fluctuate on certain boards. to save power if idle.

 

[whop1]

im running 7-8-7-20 2n

1366 board (asus rampage formula 3)

1.35 qpi/dram voltage

1.64 dram bus voltage

 

[jsc]

For DDR3-1333 RAM, your memory frequency will be 333 MHz and your memory clock will be 1333 MHz. If you are running at that speed, your BIOS setting will report the RAM clock of 1333 MHz. CPUZ will report half that. So at a CPUZ reported 872 MHz, your RAM is running at 1744 MHz.

Question: is the "1800MHz" that you are seeing an actual BIOS setting that you can change or is it the SPD value from the memory stick?

 

[blazerboy]

Correct 1800 shows up as 900, 1600 shows up as 800 etc, I was confused about that at first as well, but as said its the double data rate.

 

[whop1]

it was at 1744 mhz i didn't want to manually check so i just rounded. cpu-z was reporting 872 which was correct. however, when i run at 1744 with 7-8-7-20 2n my sc2 crashes sometimes with memory violation errors and at 1603mhz with the same timings this does not happen. anyone have any insight?