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ASUS Support Home Location : Forum > Motherboard > Crosshair IV Formula  
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  Topic : [Problem]CPU/RAM Frequency Divider Setting New Topic
Sammydad1
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Posted:5/10/2010 3:26:00 PM # 1
Hi,

Maybe I missed something, but I can't seem to find the setting for the CPU/RAM  (or is it FSB/DRAM) Divider.

Currently mine shows up (in CPU-z) at 1:4

How or where do I change it should I want to experiment with OverClocking ??

SD1

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stealth
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Posted:5/10/2010 5:49:00 PM # 2
Hi...

In bios under Extreme Tweaker>AI Overclock Tuner : Set to Manual, then in DRAM Frequency don't you have the option to set your ram in different speed depends on the FSB?

stealth

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Sammydad1
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Posted:5/10/2010 9:48:00 PM # 3
Hi,

Yes Stealth you do get the option for the FSB for the system which in turn seems to set the DRAM. frequency  In my case that means if I were to set the FSB to 250, since my board is set to a FSB-DRAM divider of 1:4 my resulting DRAM Frequency is 1000 (ending up with a DDR speed of 2000).

Maybe I missed something obvious here (wouldn't be the first time, won't be the last) but I have seen other folks indicating they have a FSB-DRAM divider of some other fraction than what mine is using.... say 3:8 (totally an example)

==============================================================
Edit Here:

I just went thru the BIOS again to make sure I didn't miss something, and I could find no setting specifically to set the FSB to DRAM ratio, so I have to assume that it is done in the BIOS automatically based on other settings like FSB and such....  The divider seems to be just a calculated virtual setting that a program like CPU-z calculates and reports.

If you set your FSB to say 285 and you set the RAM for DDR3-1600 it calculates one ratio.  If you set the RAM for DDR3-2000, it uses a different ratio "apparently" something to do with on the final CPU speed (FSB x CPU Multiplier) maybe ?

Anybody know for certain how the BIOS generates some of these numbers that aren't so obvious ?

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stealth
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Posted:5/10/2010 10:30:00 PM # 4
I see a setting in your manual which call "DRAM Frequency" and next to it says "Auto", if you go on it and press enter or press the "+ -" keys doesn't change fields?
In there you must have different choices on what speed you like to run your ram, these are your dividers.

Since we are able to run the ram faster than the FSB is more like a multiplier than divider.:-)

stealth

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Sammydad1
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Posted:5/10/2010 10:42:00 PM # 5
The Crosshair IV BIOS only has DRAM frequency settings that are based on the Extensive Tweaker section for  AUTO, Manual, and D.O.C.P. (DRAM OverClocking Profiles (akin to standard SPD settings based on certain standardized criteria)....  as taken from the manual (more or less)

BTW Stealth...I still have an A8N32-SLi Dlx in my HTPC...Love that board !!

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Asus AM3 Crosshair IV Formula, AMD Phenom II 1090T X6, 4 x 2GB G.Skill DDR3-2000 Model F3-16000CL9D-4GBRH, 3 x 750GB Hard drives, XFX Radeon HD 5830 1GB, XFX 650W PSU....
stealth
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From: Greece
Posted:5/11/2010 12:25:00 AM # 6

Quote:
Author: Sammydad1 Posted: 5/10/2010 10:42:00 PM

The Crosshair IV BIOS only has DRAM frequency settings that are based on the Extensive Tweaker section for  AUTO, Manual, and D.O.C.P.

BTW Stealth...I still have an A8N32-SLi Dlx in my HTPC...Love that board !!

Ok, if you set it to manual what options you get?

http://img526.imageshack.us/img526/1651/11181022.jpg

I still have the board is well with my Opty on it, this is actually my main PC as all the rest boards i have i use them just for overckocking/benchmarking.:-)

stealth

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stealth
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From: Greece
Posted:5/12/2010 4:18:00 PM # 7

Quote:
Author: Sammydad1 Posted: 5/10/2010 9:48:00 PM

==============================================================
Edit Here:

If you set your FSB to say 285 and you set the RAM for DDR3-1600 it calculates one ratio.  If you set the RAM for DDR3-2000, it uses a different ratio "apparently" something to do with on the final CPU speed (FSB x CPU Multiplier) maybe ?

Anybody know for certain how the BIOS generates some of these numbers that aren't so obvious ?

Is not so complicated as A64, ram speed on these boards is baced on the FSB just like Intel's boards, i.e. FSB X Ram Multi = Ram speed.
But you don't need even this any more as, depends on what FSB you choose, your bios gives you automaticly the possible speeds you are able to run your ram.

Have a look at this.

http://www.ocztechnologyforum.com/forum/showthread.php?45038-How-Can-I-Calculate-Ram-Speed-On-AM2-Systems&p=310446&highlight=#post310446

stealth

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