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Memory speed not right!

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January 7, 2009 9:41:51 PM

I just upgraded from 2x 1GB sticks of 667 ram to 2x 2GB sticks of 800 and the speed still shows 333mhz.. what am I missing??

More about : memory speed

January 7, 2009 9:55:14 PM

what is the rest of your specs? specifically the processor and the FSB?

You need to change the memory speed/voltage in the Bios
January 7, 2009 10:19:08 PM

you will have to change the divider to get the correct speed (google it). However, the difference you will notice between 667 and 800 will be all but noticeable unless you are benchmarking
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January 7, 2009 11:22:18 PM

my mainboard fsb can go up to 1066 fsb.. my processor runs at 800mhz, running intel Pentium D 3.2ghz, asus P5VD2-VM SE MB.. Nvidia GeForce 8600 (pci-e x16) with 512 on board memory, 650watt psu..
January 8, 2009 8:21:38 PM

@1066 FSB ram @ 667(333 in bios) is 1:1

**edit**
1:1 = ideal
January 9, 2009 12:18:35 AM

So take my 800mhz memory and set it to 333 in bios ?
January 9, 2009 10:17:15 AM

i have to admit, i still don't understand memory timing, even after reading the sticky! i'm slow, i know.
i don't know how dividers, CAS, FSB and memory speed all fit together.
is there a good howto that anyone knows about?
January 9, 2009 1:52:19 PM

jbrdbr111x said:
So take my 800mhz memory and set it to 333 in bios ?


Well no, not exactly...

When you are running a 1066FSB the ram will run 1:1 when it is set to 333in bios (667MHZ).


I really couldn’t say if the ram will be faster set to 400 in bios (800MHZ)... I have never seen any bench marks on this. In my mind running memory over 333(667) on a 1066FSB is pointless as the ram will be waiting on the FSB for information.

I have always reduced my ram to match FSB 1:1 and tightened the timings... so instead of say 5-5-5-5 at 400(800mhz) perhaps the memory can run 1:1 to FSB1066 with 333(667mhz) 4-4-4-4

You are fine leaving the memory @ 800… in my opinion (I have nothing to back this up) 667 with tighter timings on a 1066FSB is faster.


January 9, 2009 2:22:19 PM

Here's a shot of my cpuz..



Could you please look at these and tell me if the settings look right, and/or anything I could change to get the best out of my pc..
January 9, 2009 6:55:11 PM

1) Why is your ram in single channel mode? Make sure you have the sticks placed in slot 1 & 3 not 1&2 !
then go into CPUz and screen shot the memory for us again.
January 9, 2009 7:09:10 PM

I set the memory to 4-4-4-12, but the bios won't let me set the mhz higher than 667 for some reason 800 is not listed..

and I only have two memory slots on my mb..
January 9, 2009 8:30:28 PM

your memory is running at 555Mhz or am I wrong? Cpuz says mine is 400Mhz but in nTune it is 804Mhz.

It's FS/DRAM ... 3/5 = 0.6
333.3 /0 .6 = 555.5
January 9, 2009 8:49:51 PM

i think in cpu-z the DRAM frequency might be after the divider which would give you the 667 (333.3 * 2) but i could be mistaken on that.
January 10, 2009 2:24:44 AM

I have it set in the bios to run at 667, even though it's 800mhz memory.. It's single channel mb , so I hope the 333.3mhz isn't the speed my memory is maxing out at..
!