GA-X38-DQ6 FSB and DDR2 Speed

[spec]

Going through my Board specs, I noticed the following:
Front Side Bus: 1600/1333/1066/800 MHz FSB
Memory: 4 x 1.8V DDR2 DIMM.....
Dual Channel ........
Support for DDR2 1066/800/667 MHz memory modules

Since FSB values from the specs appear to be Quad-pump values, actual FSB would be max of 400 and min of 200Mhz, right ?

Now usually mem freq is derived from FSB with FSBx2,
hence max for this board is 400Mhz FSB , mem will run at 800MHz ???
The spec sayz 1066, indicating it can push to 533Mhz...

Something doesn't add up here, or maybe the FSB is not tied to mem directly in a FSBx2 formula... Can someone share some knowledge on this...

[Lsdmeasap]

Re: GA-X38-DQ6 FSB and DDR2 Speed

Yes CPU freq is 4X fsb

Memory is 2X FSB

To go above 800 you either need higher FSB setting or use a memory Divider is the BIOS.

For example>>>>

My XEON multi is Max 8

8 X 450 FSB = 3.6 Ghz
2 X 450 Memory Freq = 900Mhz At 1:1 divider (2.0 is BIOS)

Using a Divider for the above settings
450 X 3.2(Memory Divider) = 1440 Mhz Memory Freq

[spec]

Re: GA-X38-DQ6 FSB and DDR2 Speed

Yes CPU freq is 4X fsb

Memory is 2X FSB

To go above 800 you either need higher FSB setting or use a memory Divider is the BIOS.

For example>>>>

My XEON multi is Max 8

8 X 450 FSB = 3.6 Ghz
2 X 450 Memory Freq = 900Mhz At 1:1 divider (2.0 is BIOS)

Using a Divider for the above settings
450 X 3.2(Memory Divider) = 1440 Mhz Memory Freq

so currently i'm running my CPU at stock 266x9 = 2.4Ghz.
Is my mem running at 266x2 ?

[Lsdmeasap]

Re: GA-X38-DQ6 FSB and DDR2 Speed

What do you have your memory sections set on? Did you look at the sticky I posted yet? It will explain all that to you but I can if you post this back for me

*NOTE*
You may have more or less entries then this, this is for DS4, if you have more add them in, less leave them out. The Highlighted areas are what is going to tell me and you what your ram is running at.


Robust Graphics Booster___________ [Auto]
CPU Clock Ratio ____________ [9]
CPU Host Clock Control_ [Enabled]
CPU Host Frequency (MHz)__________ [266]
PCI Express Frequency (Mhz)_______ [102]
C.I.A. 2__________________________ [Disabled]
System Memory Multiplier (SPD)____ [2.00]
DRAM Timing Selectable_______ SPD __ [Manual]

CAS Latency Time_____________ 5 ____ ?
Dram RAS# to CAS# Delay______ 5 ____ ?
Dram RAS# Precharge Delay_____5 ____?
Precharge Delay (tRAS)________15 ____ ?
ACT to ACT Delay (tRRD)_______4 _____ ?
Rank Write to READ Delay______3 _____ ?
Write to Precharge Delay______6 _____ ?
Refresh to ACT Delay________42 ______ ?
Read to Precharge Delay_______4 _____ ?
Static tRead Value_______________ 1-31
Static tRead Phase Adjust________ 1-31

System Voltage Control____ [Manual]
DDR2 OverVoltage Control__ [+0.300V]
PCI-E OverVoltage Control_ [+0.1V]
FSB OverVoltage Control___ [+0.1V]
(G)MCH OverVoltage Control [+0.1V]
CPU Voltage Control_______ [1.25]

The above settings is 533 Ram speed 2.0 or 1:1 ram. 2 X 266Mhz

[spec]

Re: GA-X38-DQ6 FSB and DDR2 Speed

ok, checked this now, the BIOS is displaying a read only field with 1066Mhz as the RAM speed, which should be the case.

I just updated to F8 BIOS y'day evening, so far so good, everything seems to be working. Yet to try the direct CPU fan to check if the fan will throttle according to temps. There was an issue in F7 where CPU fan was always running at 100%.

[Lsdmeasap]

Re: GA-X38-DQ6 FSB and DDR2 Speed

Read only is because you have this field on Auto>>>
System Memory Multiplier (SPD)____ [2.00]