Hey all,
I need a bit of a hand tuning up my timings, mainly tRD, I have read a few articles on the tRD and phase shift but I am having a bit of trouble applying the theory.
Here are the articals for background reading on how I got to where I am (The POST equation doesn't apply for me, different board):
http://www.anandtech.com/showdoc.aspx?i=3190&p=12
http://www.anandtech.com/mb/showdoc.aspx?i=3208&p=5
First thing I have done is read the SPD data off from my RAM and applied those in BIOS, if anyone has a X38-DQ6 this is what they equate to.
ACT to ACT Delay(tRRD) : tRRD
Rank Write to READ Delay : tWTR (Memset reading is tCL-1+BL/2+tWTR, where BL is 8)
Write To Precharge Delay : tWR (Memset reading is tCL-1+BL/2+tWR, where BL is 8)
Refresh to ACT Delay : tRFC
Read To Precharge Delay : tRTP
So to start off I have got my ram set at 4-4-4-12 at 400Mhz FSB 1:1, with the advanced timings set to their EEP numbers. At tRD AUTO (12) I get 6732Mb/s Read, 80.1 ns. At tRD 8, 7424MB/s, 69.8ns. At tRD 7, 7662MB/s, 67.5ns. At tRD 6 it wont post and just beeps.
My Ram has an EPP profile at 500Mhz so I can make it go faster (5-5-5-15) so I will set those values and use a 2.4 multi on 425FSB (gives max CPU freq 3.4Ghz) and see what I get. I don't want to overclock the RAM really as I have had stuff fail easily so I am sticking to the EPP timings on it.
Its a balancing act to try and get tRD low as I can and maximise my throughput but I need a bit of guidance in the FSB, multi, tRD tadeoffs.
Here is my current BIOS template for reference.
MB Intelligent Tweaker (MIT)
Robust Graphics Booster: Auto
CPU Clock Ratio: 8
CPU Host Clock Control: Enabled
CPU Host Frequency(Mhz) : 400
PCI Express Frequency (Mhz) : 100
C.I.A.2: Disabled
Performance Enhance : Standard
System Memory Multiplier (SPD) : 2.00D
Memory Frequency(Mhz): 800
DRAM Timing Selectable : Manual
Standard Timing Control
CAS Latency Time: : 4
DRAM RAS# to CAS# : 4
DRAM RAS# Precharge : 4
Precharge Delay(tRAS) : 12
Advanced Timing Control
ACT to ACT Delay(tRRD) : 3
Rank Write to READ Delay : 3
Write To Precharge Delay : 6
Refresh to ACT Delay : 51
Read To Precharge Delay : 3
tRD : 7
tRD Phase Adjustment : Auto
Command to #CS Timing: : 2T
Clock Driving and Skew Control
CPU/PCIEX Clock Driving Control : 800mV
CPU Clock Skew Control : Normal
(G)MCH Clock Skew Control : Normal
System Voltage Control
DDR2 OverVoltage Control : 0.2V
PCI-E OverVoltage Control :Normal
FSB OverVoltage Control : 0.1V
(G)MCH OverVoltage Control : 0.1V
MCH Reference Voltage Control : Normal
DDR Reference Voltage Control : Normal
DDR Termination Voltage Control : Normal
CPU GTLREF1 Voltage : Auto
CPU GTLREF2 Voltage : Normal
Loadline Calibration : Disable
CPU Voltage Control : 1.4125V
Advanced Bios Features
Limit CPUID Max to 3 : Disabled
No-Execute Memory Protect : Disabled
CPU Enhanced Halt(CIE) : Disabled
CPU Thermal Monitor 2 : Enabled
CPU EIST Function : Disabled
I need a bit of a hand tuning up my timings, mainly tRD, I have read a few articles on the tRD and phase shift but I am having a bit of trouble applying the theory.
Here are the articals for background reading on how I got to where I am (The POST equation doesn't apply for me, different board):
http://www.anandtech.com/showdoc.aspx?i=3190&p=12
http://www.anandtech.com/mb/showdoc.aspx?i=3208&p=5
First thing I have done is read the SPD data off from my RAM and applied those in BIOS, if anyone has a X38-DQ6 this is what they equate to.
ACT to ACT Delay(tRRD) : tRRD
Rank Write to READ Delay : tWTR (Memset reading is tCL-1+BL/2+tWTR, where BL is 8)
Write To Precharge Delay : tWR (Memset reading is tCL-1+BL/2+tWR, where BL is 8)
Refresh to ACT Delay : tRFC
Read To Precharge Delay : tRTP
So to start off I have got my ram set at 4-4-4-12 at 400Mhz FSB 1:1, with the advanced timings set to their EEP numbers. At tRD AUTO (12) I get 6732Mb/s Read, 80.1 ns. At tRD 8, 7424MB/s, 69.8ns. At tRD 7, 7662MB/s, 67.5ns. At tRD 6 it wont post and just beeps.
My Ram has an EPP profile at 500Mhz so I can make it go faster (5-5-5-15) so I will set those values and use a 2.4 multi on 425FSB (gives max CPU freq 3.4Ghz) and see what I get. I don't want to overclock the RAM really as I have had stuff fail easily so I am sticking to the EPP timings on it.
Its a balancing act to try and get tRD low as I can and maximise my throughput but I need a bit of guidance in the FSB, multi, tRD tadeoffs.
Here is my current BIOS template for reference.
MB Intelligent Tweaker (MIT)
Robust Graphics Booster: Auto
CPU Clock Ratio: 8
CPU Host Clock Control: Enabled
CPU Host Frequency(Mhz) : 400
PCI Express Frequency (Mhz) : 100
C.I.A.2: Disabled
Performance Enhance : Standard
System Memory Multiplier (SPD) : 2.00D
Memory Frequency(Mhz): 800
DRAM Timing Selectable : Manual
Standard Timing Control
CAS Latency Time: : 4
DRAM RAS# to CAS# : 4
DRAM RAS# Precharge : 4
Precharge Delay(tRAS) : 12
Advanced Timing Control
ACT to ACT Delay(tRRD) : 3
Rank Write to READ Delay : 3
Write To Precharge Delay : 6
Refresh to ACT Delay : 51
Read To Precharge Delay : 3
tRD : 7
tRD Phase Adjustment : Auto
Command to #CS Timing: : 2T
Clock Driving and Skew Control
CPU/PCIEX Clock Driving Control : 800mV
CPU Clock Skew Control : Normal
(G)MCH Clock Skew Control : Normal
System Voltage Control
DDR2 OverVoltage Control : 0.2V
PCI-E OverVoltage Control :Normal
FSB OverVoltage Control : 0.1V
(G)MCH OverVoltage Control : 0.1V
MCH Reference Voltage Control : Normal
DDR Reference Voltage Control : Normal
DDR Termination Voltage Control : Normal
CPU GTLREF1 Voltage : Auto
CPU GTLREF2 Voltage : Normal
Loadline Calibration : Disable
CPU Voltage Control : 1.4125V
Advanced Bios Features
Limit CPUID Max to 3 : Disabled
No-Execute Memory Protect : Disabled
CPU Enhanced Halt(CIE) : Disabled
CPU Thermal Monitor 2 : Enabled
CPU EIST Function : Disabled
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