GTL O.C. Help DFI DK X48

[TomFL]

Need practical help overclocking GTL values

Genie BIOS Template.

[code]
CPU Feature
Thermal Management Control: Disabled
PPM(EIST) Mode: Disabled
Limit CPUID MaxVal: Disabled
CIE Function: Disabled
Execute Disable Bit: Disabled
Virtualization Technology: Disabled
Core Multi-Processing: Enabled

Exist Setup Shutdown: Mode 2
CPU Clock Ratio: 8x
Target CPU Clock:3320
CPU Clock:415
Boot Up Clock:Auto
DRAM Speed:333/667
Target DRAM Speed:830
PCIE Clock: 100mhz
PCIE Slot Config: 1X 1X

CPU Spread Spectrum: Disabled
PCIE Spread Spectrum: Disabled
SATA Spread Spectrum: Disabled

Voltage Settings
CPU VID Special Add:125.0 mv
DRAM Voltage Control:1.925v
SB Core/CPU PLL Voltage:1.510v
NB Core Voltage:1.265
CPU VTT Voltage:1.211
Vcore Droop Control: Enabled
Clockgen Voltage Control: 3.45v
GTL+ Buffers Strength: Strong
Host Slew Rate: Weak
CPU GTL1/3 REF Volt: .667x
CPU GTL 0/2 REF Volt: .667x
North Bridge GTL REF Volt: .67

DRAM Timing
Enhance Data transmitting: AUTO
Enhance Addressing: AUTO
T2 Dispatch: Auto

Clock Setting Fine Delay
Ch1 Clock Crossing Setting: AUTO
DIMM 1 Clock fine delay: Current
DIMM 2 Clock fine delay: Current
Ch 1 Command fine delay: Current
Ch 1 Control fine delay: Current


Ch2 Clock Crossing Setting: AUTO
DIMM 3 Clock fine delay: Current
DIMM 4 Clock fine delay: Current
Ch 2 Command fine delay: Current
Ch 2 Control fine delay: Current

Ch1Ch2 CommonClock Setting: Auto

Ch1 RDCAS GNT-Chip Delay: Auto
Ch1 WRCAS GNT-Chip Delay: Auto
Ch1 Command to CS Delay: Auto

Ch2 RDCAS GNT-Chip Delay: Auto
Ch2 WRCAS GNT-Chip Delay: Auto
Ch2 Command to CS Delay: Auto

CAS Latency Time (tCL):Auto
RAS# to CAS# Delay (tRCD):Auto
RAS# Precharge (tRP):Auto
Precharge Delay (tRAS):Auto
All Precharge to Act: AUTO
REF to ACT Delay (tRFC): AUTO
Performance LVL (Read Delay) (tRD): AUTO

Read delay phase adjust: Enter

Ch1 Read delay phase (4~0)
Channel 1 Phase 0 Pull-In: Auto
Channel 1 Phase 1 Pull-In: Auto
Channel 1 Phase 2 Pull-In: Auto
Channel 1 Phase 3 Pull-In: Auto
Channel 1 Phase 4 Pull-In: Auto

Ch2 Read delay phase (4~0)
Channel 2 Phase 0 Pull-In: Auto
Channel 2 Phase 1 Pull-In: Auto
Channel 2 Phase 2 Pull-In: Auto
Channel 2 Phase 3 Pull-In: Auto
Channel 2 Phase 4 Pull-In: Auto

MCH ODT Latency: AUTO
Write to PRE Delay (tWR): AUTO
Rank Write to Read (tWTR): AUTO
ACT to ACT Delay (tRRD): AUTO
Read to Write Delay (tRDWR): AUTO
Ranks Write to Write (tWRWR): AUTO
Ranks Read to Read (tRDRD): AUTO
Ranks Write to Read (tWRRD): AUTO
Read CAS# Precharge (tRTP): AUTO
ALL PRE to Refresh: AUTO

My bios has VCore at 1.39
CPUZ has it at 140-1.42
drops to 1.392 under load (prime 95)

I am prime 95 stable at these settings but I would like to increase overclock and FSB
without adding much more Vcore by adjusting VTT and GTL voltages

Need a practical guide geared tward my particular board

PS looking for 24/7 stability

Thanks
Tom

[Clunk]

There is some info here that will help you.

Your CPU will prefer around 67% GTL REF, so that chart should be a good starting point.



The thing to remember is that when you adjust the VTT, you MUST tweak the GTL REF afterwards, so it all plays nicely.

From the above chart, you can see that 1.1v VTT set in the BIOS will give you 1.060v real voltage, so 67% of that real voltage (when measured with a DMM) will give you the values in the top row.

You can use the other charts in the link if you want a higher VTT voltage.

As all setups are different, it really is a case of experimenting and seeing what you can come up with, but at least you are in the right ball park now

[TomFL]

Thanks Clunk

I have seen that chart.

Maybe I am missing something but the bios for my board
DFI LP DK X48 does not have GTL adjustments numbers like those above.

It goes from .667x down to .61x

or 66.7% down to 61 %

I am running at the lowest possible VTT 1.211v

and GTL ref defaulted to .667x which is close to the 67 % you mentioned

Do I just leave at that reference value or do I look for lower reference values as I raise VTT
to match FSB increases ?

Tom

[Clunk]

Ah, sorry, I thought you had the LT, I have mixed you up with someone else.

I don't have that board, and haven't used it, but by the looks of it, it seems like you have direct values for the GTL REF, and they are already set to 67%.

I suspect that it will do it automatically as you raise the VTT, I will find out for sure later for you.

For now, why not try upping the VTT and NB voltage and see how that helps? You are only at 415FSB, so you shouldnt need a great deal anyway, if anything at all

[TomFL]

Ok I will give it a shot later. I am stable at this point but want to go higher

BTW when discussing vcore do you go by the bios value or the cpuz load value

or do you actually measure it ? load or idle ?

Thanks again

Tom

[Clunk]

Nah, no need to measure Vcore, just set it in the BIOS and if you need more, add some, and if not, the job's a good un