Vasiok Posted September 14, 2008 Share Posted September 14, 2008 Hello again, I've been doing continuing research as to why 4x1 sticks of 8500C5D do not work with P5Q Deluxe and why 2x1 work very intermittently... I came to the following conclusion, the tRFC timing is ******** to stability of these chips. After some research I found the following threads: http://www.********technologyforum.com/forum/showthread.php?t=35435 http://www.********technologyforum.com/forum/showthread.php?t=36048 http://www.xtremesystems.org/Forums/showthread.php?t=189437&page=8 (First post on this page) After looking into the default values, 8500C5D SPD has tRFC of around 22-40 (Not sure who to believe, Everest or CPUZ) This is way to tight to run on P45 board it seems. My testing: 1. Get 1 module to boot, change tRFC to 55. 2. Insert 4 modules in, reboot (not cold boot) 3. Pass memtest/orthos blend for few hours It is stable with tRFC of 55. Next step, I go back into bios, and set tRFC to default value... reboot, and it doesn't post! Now my question... ******** provides an SPD flash tool, does corsair offer something similar? Is there anyway I can reflash these modules to have 55 tRFC by SPD? Thanks! edit: **** are apparently edits for competitor names Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted September 15, 2008 Corsair Employees Share Posted September 15, 2008 Just set it manually to 55 then if that allows the system to post but with 4 modules DDR800 would be suggested. Link to comment Share on other sites More sharing options...
Vasiok Posted September 15, 2008 Author Share Posted September 15, 2008 Just set it manually to 55 then if that allows the system to post but with 4 modules DDR800 would be suggested. That doesn't work for cold boots. I've been pushing 4x1 with 55 for about a week now. But my PC is not being turned off, just into vista's sleep mode. If I turn it off, it will not boot. My theory is that the board first boots using JDEC settings, which are unstable, and then tries to apply bios overclock settings (55 value). It's just that it crashes before reaching the 55 point on cold boot. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted September 15, 2008 Corsair Employees Share Posted September 15, 2008 Can you tell me bios settings you have set for both CPU and memory and any performance settings that you may have set? Link to comment Share on other sites More sharing options...
Vasiok Posted September 16, 2008 Author Share Posted September 16, 2008 AI Overclock tuner: MANUAL CPU Ratio Setting: 9 FSB Strap to North Bridge: 333 FSB Frequency: 333 PCI-E Frequency: 100 DRAM Frequency: 1066 DRAM CLK Skew on Channel A1: AUTO DRAM CLK Skew on Channel A2: AUTO DRAM CLK Skew on Channel B1: AUTO DRAM CLK Skew on Channel B2: AUTO DRAM Timing Control: MANUAL 1st Information : CAS# Latency: 5 DRAM RAS# to CAS# Delay: 5 DRAM RAS# Precharge: 5 DRAM RAS# Activate to Precharge: 15 RAS# to RAS# Delay : AUTO Row Refresh Cycle Time: 55 Write Recovery Time: AUTO Read to Precharge Time: AUTO 2nd Information : READ to WRITE Delay (S/D): AUTO Write to Read Delay (S): AUTO WRITE to READ Delay (D): AUTO READ to READ Delay (S): AUTO READ to READ Delay (D): AUTO WRITE to WRITE Delay (S): AUTO WRITE to WRITE Delay (D): AUTO 3rd Information : WRITE to PRE Delay: AUTO READ to PRE Delay: AUTO PRE to PRE Delay: AUTO ALL PRE to ACT Delay: AUTO ALL PRE to REF Delay: AUTO DRAM Static Read Control: DISABLED DRAM Read Training: DISABLED MEM. OC Charger: AUTO AI Clock Twister: Lighter AI Transaction Booster: MANUAL Common Performance Level 8 All Pull-In's: Disabled CPU Voltage: 1.325 CPU GTL Voltage Reference (0/2): AUTO CPU GTL Voltage Reference (1/3): AUTO CPU PLL Voltage: AUTO FSB Termination Voltage: 1.2 DRAM Voltage: 2.1 v (The board overvolts to around 2.18) NB Voltage: 1.2 NB GTL Reference: AUTO SBridge Voltage: 1.2 PCIE SATA Voltage: AUTO Load Line Calibration: ENABLED CPU Spread Spectrum: DISABLED PCIE Spread Spectrum: DISABLED With these settings I am able to run it completely stable (Orthos/Memtest passing). For about a week I have not shut down my PC, but if I do, it will not boot. I am using some very conservative, stable, bios settings. I am sure the memory and the board can handle much stiffer timings and higher freq if it was able to boot at all. Don't want to check OC limits while it can't boot. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted September 16, 2008 Corsair Employees Share Posted September 16, 2008 Set the CPU Frequency at 266 Mhz and see if that solves the Cold Boot issue. Link to comment Share on other sites More sharing options...
Vasiok Posted September 16, 2008 Author Share Posted September 16, 2008 FSB makes no difference. Anyways, it's just a theory, I presume that Corsair does not offer SPD flashing utility. Too bad. Seriously, after 6 years studying and getting two advanced degree's in Computer Engineering I would think I'd know to check all sorts of clocks. Cya. I have a feeling that it's not per se Corsair, but Micron D9 chips that are in this memory. I've read quiet a few posts of these chips not liking P45. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted September 16, 2008 Corsair Employees Share Posted September 16, 2008 That would be easy to tell, if the modules are 1.0 Gig density modules and version 1.x then they will Micron Based. Link to comment Share on other sites More sharing options...
Vasiok Posted September 17, 2008 Author Share Posted September 17, 2008 That would be easy to tell, if the modules are 1.0 Gig density modules and version 1.x then they will Micron Based. Indeed they are. This somewhat explains why this board can run 4x2gb sticks but can't run 4x1gb sticks. Link to comment Share on other sites More sharing options...
DerekT Posted September 17, 2008 Share Posted September 17, 2008 Indeed they are. This somewhat explains why this board can run 4x2gb sticks but can't run 4x1gb sticks. I have the P5K-Premium and have run with 4 X 1024 of the 8500C5 version 1.1 Micron D9GMH with no issues. It does need 1.45v on the Northbridge though. The Maximus Formula (X38) will not run 1 let alone 4 Microns. I have not heard of issues with Microns and P45, just X38/X48. I have used SPD Tool with good results. It is now in version 062. http://forums.techpowerup.com/showthread.php?t=20349 I've never had an issue. I understand that you have the knowledge to use the tool, however I will also post a very good tutorial for any others who look at using this tool. http://forums.overclockers.com.au/showthread.php?t=562506 To others. Keep in mind that if you play with the JEDEC settings, you can disable your system from a startup. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted September 17, 2008 Corsair Employees Share Posted September 17, 2008 And please note if you change the modules SPD that will void the warranty! Link to comment Share on other sites More sharing options...
Vasiok Posted September 17, 2008 Author Share Posted September 17, 2008 I have the P5K-Premium and have run with 4 X 1024 of the 8500C5 version 1.1 Micron D9GMH with no issues. It does need 1.45v on the Northbridge though. The Maximus Formula (X38) will not run 1 let alone 4 Microns. I have not heard of issues with Microns and P45, just X38/X48. I have used SPD Tool with good results. It is now in version 062. http://forums.techpowerup.com/showthread.php?t=20349 I've never had an issue. I understand that you have the knowledge to use the tool, however I will also post a very good tutorial for any others who look at using this tool. http://forums.overclockers.com.au/showthread.php?t=562506 To others. Keep in mind that if you play with the JEDEC settings, you can disable your system from a startup. Thank you very much. SPDtool is not compatible with P45 boards. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted September 17, 2008 Corsair Employees Share Posted September 17, 2008 You can use another MB to set them if you like but I did not tell you that. I would suggest Intel 965/975 chipset. Link to comment Share on other sites More sharing options...
Vasiok Posted September 18, 2008 Author Share Posted September 18, 2008 You can use another MB to set them if you like but I did not tell you that. I would suggest Intel 965/975 chipset. :) Yeah, I understood as much. Maybe I'll try this later. Thanks for all responses! Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted September 18, 2008 Corsair Employees Share Posted September 18, 2008 NP and good luck! Link to comment Share on other sites More sharing options...
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