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[Guide] Asus P5B Deluxe / Commando P965 JP Pmem Strap Tweaks - i4memory.com - different look at memory

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Old 12-07-2007, 01:29 PM   #1
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Cool [Guide] Asus P5B Deluxe / Commando P965 JP Pmem Strap Tweaks

Old boot @400FSB and clockgen/setfsb up:


On Asus P5B Deluxe/Commando when you tip over 400FSB to 401+ FSB there's a strap change causing a massive reduction in system memory bandwidth and performance/latency. In the past to keep decent performance on Asus P5B Deluxe/Commando above 401FSB, we booted into windows at 400FSB and clockgen/setfsb our way up past 400FSB. This method required alot more vMCH (northbridge) voltage. For example, for my Asus Commando to hit 400FSB setfsb/clockgen up to 470FSB I needed bios set 1.75v vMCH voltage.


JP Pmem Strap Tweaks:


A few hints have been thrown around on Xtremesystems.org forums about tweaking the NB Strap settings even further within windows on the fly. Most of them refer back to jp's thread over at http://www.ixtremtek.com/forums/showthread.php?t=76 where he outlines the tweaks for Asus P5B Deluxe which from my own tests are spot on for Asus Commando as well

There's 2 sets of tweaks, the original tweaks (32bit) for when you tip over the 400FSB strap change line to 401+ FSB. Then jp found some other tweaks (8bit) for at high FSB i.e. 500FSB marks. Both sets of tweaks require the use of an awesome little application called PMem.


:viewfull:

Last edited by eva2000; 21-05-2008 at 03:03 AM.
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Old 12-07-2007, 01:30 PM   #2
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Re: [Guide] Asus P5B Deluxe / Commando P965 JP Pmem Strap Tweaks


-----------------------------------------
Original tweaks (32bit):
-----------------------------------------

Consisted of tweaking 5 memory address regions at FED14030 and FED14040.
  • R5 - 0000000B > 0B038009
  • R4 - 842B4407 > 23034417
  • R3 - 00000000 > 37000000
  • R2 - 36802800 > 01002810 - boost in COPY
  • R1 - 00025A00 > 000F5A06 - boost in READ
> denotes change to

Using 10x400FSB vs 10x401FSB boot as an example:

10x400FSB boot


10x401FSB boot


10x401FSB boot with JP Pmem strap tweaks applied to the 5 regions


(left side is 10x400FSB boot vs right side 10x401FSB boot tweaked).

Last edited by eva2000; 21-05-2008 at 03:01 AM.
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Old 12-07-2007, 01:33 PM   #3
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Re: [Guide] Asus P5B Deluxe / Commando P965 JP Pmem Strap Tweaks


-----------------------------------------
High FSB tweaks (8bit):
-----------------------------------------

Used at high FSB boot configurations. Much easier to implement and remember off the top of my head

  • FED14034h => 10
  • FED1403Fh => 24 *
  • FED1403Eh => 03
  • FED14030h => 06
  • FED14040h => 09
* Memory address: FED1403Fh , when set at 23 need a lot of v-mch, when high fsb, set it to 24 is better (only if 23 is impossible)

I'm using 8x500FSB 1:1 boot configuration with 1.5v vMCH northbridge voltage as an example of jp Pmem strap tweaks.
  • Memory Read jumped from 8890MB/s to 9887MB/s (11.215% faster)
  • Memory Write stayed approximately the same
  • Memory Copy jumped from 7671MB/s to 9093MB/s (18.537% faster)
  • Memory Latency tightened from 71.7ns to 57.1ns (20.363% faster)
  • Super Pi 32M time dropped from 12m 49.281s to 12m 24.844s (3.177% faster)

8x500FSB 1:1 boot default


8x500FSB 1:1 jp Pmem strap tweaked


Bios settings used:
Extreme Tweaker:
AI Tuning: Manual
CPU Frequency: 500FSB
DRAM Frequency: DDR2-1000MHz (1:1 Divider)
PCI Express Frequency: 100
PCI Clock Synchronisation: 33.33
Spread Spectrum: Disabled
CPU Vcore Voltage: 1.575
FSB Termination Voltage: 1.4
NB Vcore: 1.5
Memory Voltage: 2.2
DDRII Channel A REF Voltage: Auto
DDRII Channel B REF Voltage: Auto
DDRII Controller REF Voltage: Auto
SB Vcore (SATA, PCIE): 1.6
SB Chipset Voltage: 1.225

Asus C.G.I.: Disabled
Static Read Control: Disabled
Configure DRAM Timing by SPD: Disabled
- DRAM CAS# Latency: 4
- DRAM RAS# to CAS# Delay: 4
- DRAM RAS# Precharge: 4
- DRAM RAS# Activate to Precharge: 5
- DRAM Write Recovery Time: 3
- DRAM TRFC: 30
- DRAM TRRD: 3
- Rank Write to Read Delay: 10
- Read to Precharge Delay: 10
- Write to Precharge Delay: 10

Legacy USB Support: Disabled

CPU Configuration
Modify Ratio Support: Enabled
- Ratio CMOS Setting: 8x
C1E Support: Disabled
Max CPUID Value Limit: Disabled
Vanderpool Technology: Disabled
CPU TM function: Disabled
Execute Disable Bit: Disabled
PECI: Disabled

Last edited by eva2000; 21-05-2008 at 03:02 AM.
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Old 12-07-2007, 01:33 PM   #4
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Re: [Guide] Asus P5B Deluxe / Commando P965 JP Pmem Strap Tweaks

End result is something like this


Last edited by eva2000; 21-05-2008 at 03:03 AM.
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Old 03-09-2007, 07:22 PM   #5
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Re: [Guide] Asus P5B Deluxe / Commando P965 JP Pmem Strap Tweaks

Original post http://www.ixtremtek.com/forums/show...4&postcount=18

I've performed a little bit of testing yesterday. Here are the results.

M/B:ASUS P5B-Deluxe 1.03G P965C1 rev., Vcore, Vdroop, Vdimm, Vmch mods
CPU:Intel Core2 E6700 L633A550
CPU cooling:Watercooling Alphacool
Memory:Wintec PC2-8000 C5 1024MBx1
VGA:Jaton 8600GS
HDD:Western Digital 80GB
Power Supply:Antec TP 550W
Vcore:1.390V(Bios)
Vdimm:2.62V(Actual)
FSB Termination Voltage:1.45V
NB Voltage:1.71V(Actual)
OS:Windows Server 2003

Boot clocks: 570FSBx6 1:1

Max FSB with original 1333 strap: 589FSBx6 validated; 591FSBx6 frozen screen
CAS Latency: 4
RAS to CAS Write Delay: 4
RAS to CAS Write Delay: 4
RAS Precharge: 4
Precharge Delay: 8
All Precharge to Activate: 4
Refresh Cycle Time: 30
Performance Level: 10
Write to Precharge Delayed: 11
Write to Read Delayed: 10
Activate to Act. Delayed: 10
Read to Write Delay: 8
Read to Precharge: 8
All Precharge to Refresh Delay: 4
Precharge to Precharge Delay: 2

Max FSB with modded 1333 strap: 584FSBx6 validated; 585FSBx6 frozen screen
CAS Latency: 4
RAS to CAS Write Delay: 4
RAS to CAS Write Delay: 2
RAS Precharge: 4
Precharge Delay: 8
All Precharge to Activate: 4
Refresh Cycle Time: 25
Performance Level: 1
Write to Precharge Delayed: 11
Write to Read Delayed: 10
Activate to Act. Delayed: 3
Read to Write Delay: 7
Read to Precharge: 2
All Precharge to Refresh Delay: 4
Precharge to Precharge Delay: 2





http://valid.x86-secret.com/show_oc.php?id=237597

Strap modding study:

These figures show the Everest benchmark results obtained after modding the mchbar addresses the one after the other. Only results with significant changes are given.



Mean = 8698.22
SD = 95.73
VAR = 9163.59

Best = FED14040h = 08 => 8760 MB/s

FED14030h and FED14040h look like to have a significant impact on memory read performance.




Mean = 7196.94
SD = 43.89
VAR = 1926.53

Best = FED14030h = 06 => 7317 MB/s

FED1403Eh and FED14030h look like to have a significant impact on memory copy performance. BTW changing other addresses cause this improvement to be moderated and stabilized within 7170 MB/s to 7200 MB/s. A bit strange IMO.



Mean = 82.27
SD = 7.04
VAR = 49.57

Best = FED1403Bh = 37 => 76.8 ns

FED14040h and FED1403Bh look like to have a significant impact on memory latency performance.



Mean = 26790.22
SD = 45.57
VAR = 2076.30

Best = FED14040h = 09 => 26825 MB/s

FED14040h looks like to have a significant impact on L2 Cache read performance.



Mean = 21678.11
SD = 48.68
VAR = 2369.99

Best = FED14042h = 03 => 21721 MB/s

FED14042h and FED14040h look like to have a significant impact on L2 Cache write performance.



Mean = 29395.69
SD = 53.64
VAR = 2877.66

Best = FED14040h = 08 => 29444 MB/s

Mostly FED14040h but also a bit lesser FED14042h look like to have a significant impact on L2 Cache copy performance.



Mean = 4.93
SD = 0.27
VAR = 0.07

Best = FED14042h = 02 = FED1403Bh = 37 => 4.7 ns

FED14040h looks like to have a significant impact on L2 Cache latency performance. We could notice the small improvement given by FED14042h and FED1403Bh.
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Old 03-09-2007, 08:04 PM   #6
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Re: [Guide] Asus P5B Deluxe / Commando P965 JP Pmem Strap Tweaks

Hey before thanks for the info.. alot of work done there

When i did above tests at 500-501FSB, FED1403Bh was already set to 37 on Asus Commando. Was it different by default on P5B Deluxe or just it changed at 570+ FSB (never got a cpu that far) ?
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Old 03-09-2007, 10:18 PM   #7
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Re: [Guide] Asus P5B Deluxe / Commando P965 JP Pmem Strap Tweaks

That's really interesting I've got no clue; I'm gonna give it a glance.

I'm about to finish a small single stage to make some tests @600FSB. It's built with a rotary cp but the cap tube is so short that I'm not aiming for very cold temps but strong hold of load. I hope to be able to use strap tweaks even with very high FSB values.
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Old 07-02-2008, 02:15 PM   #8
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Re: [Guide] Asus P5B Deluxe / Commando P965 JP Pmem Strap Tweaks

sorry to be a thread digger

but ive been doing some testing with values on the x38t-dq6 board, i get a 5% memory performance jump when tightening up FED1403Fh to 23 on this motherboard, great to finally get time to test these things!
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