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System won't POST when running memory at rated speeds

post #1 of 9
Thread Starter 
I just bought a 2x4GB set of Corsair Low Profile memory.

It's rated at 9-9-9-24 @ 1600 MHz, 1.5V.

When I go into my BIOS and change the FSB.DRAM ratio so that it's at 1600 MHz instead of 1333 MHz and boot, everything is fine. However, the timings shown in CPU-Z are 11-11-11-29 1T instead of 9-9-9-24 2T.

When I manually change the timings in the BIOS to 9-9-9-24, the system will not POST. Interestingly enough, if I manually change the timings to be identical to what "automatic" would have put them at (11-11-11-29), the system still won't post (this is with command rate at 2T).

Is this just a limitation of my motherboard?..

Also, the minimum DRAM voltage for my motherboard is 1.584V, which is already higher than the recommended 1.5V.
Edited by Genome852 - 9/9/11 at 3:32pm
post #2 of 9
Ah, yes the old "my-PhII-won't-run-this-jazz-at-1600mhz." Unfortunately, these AM3 chips and boards will often have a fit unless you lower the clock speed to 1333. On the plus side you might be able to adjust the timings down quite a bit (I'm running at CL7 for example) if you play with it some more, and probably get about equal performance to a 1600mhz pair.
 
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CPUMotherboardGraphicsRAM
i7 6700k @ 4.5 MSI Z170A M5 6gb EVGA GTX 980Ti SC 16gb Corsair DDR4 2400mhz 
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Crucial 500gb SSD + assorted WD Caviars of vary... Sony 24x DVDRW Noctua NH-D14 Win 8.1 
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27" Asus ROG PG278Q / 21.5" Asus VH226H 6gv2 (Cherry Black) Corsair RM750 Phanteks Enthoo Pro 
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i5 3570k @ 4.2ghz MSI Z77A-GD65 Sapphire 6950 950/1300 6GB Crucial Ballistix 1600 CL8 
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Vacuum Cleaner
(14 items)
 
 
CPUMotherboardGraphicsRAM
i7 6700k @ 4.5 MSI Z170A M5 6gb EVGA GTX 980Ti SC 16gb Corsair DDR4 2400mhz 
Hard DriveOptical DriveCoolingOS
Crucial 500gb SSD + assorted WD Caviars of vary... Sony 24x DVDRW Noctua NH-D14 Win 8.1 
MonitorKeyboardPowerCase
27" Asus ROG PG278Q / 21.5" Asus VH226H 6gv2 (Cherry Black) Corsair RM750 Phanteks Enthoo Pro 
MouseOther
Zowie FK2 Wacom CTL480 
CPUMotherboardGraphicsRAM
i5 3570k @ 4.2ghz MSI Z77A-GD65 Sapphire 6950 950/1300 6GB Crucial Ballistix 1600 CL8 
Hard DriveHard DriveOptical DriveCooling
2 x 500GB WD Caviar/150GB WD Passport 128GB Samsung 840 Sony Optiarc DVDRW Tuniq Tower 120mm 
OSKeyboardPowerCase
Win 7 x64 Steelseries 6Gv2 (Cherry black) 750W Rosewill Xtr Azza Helios 910 
MouseMouse Pad
Deathadder 3.5G Icemat (Blue!) 
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post #3 of 9
Thread Starter 
Well... my BIOS won't even let me loosen the timings. With this kit the computer will only boot if the timings are set to "auto." If I put them on manual but make them exactly the same or even slower, it still won't boot. I can't even set the command rate to 2T instead of 1T.

Why can't my things just work for once. Damn.
Edited by Genome852 - 9/9/11 at 5:57pm
post #4 of 9
Remove that 3rd DIMM. C2 rev processors can have complications with more than 2 DIMMs. Two reasons it won't benefit you anyway: 1. you are likely to never use over 8GB of RAM (I run several RAM intensive apps but NEVER use over 8GB) and 2. when using over 8GB RAM, the setup will revert to single channel resulting in loss of performance.
post #5 of 9
Thread Starter 
My signature isn't accurate... right now I'm only using the new Corsair kit.

I'm mostly concerned as to why I can't change the timings to "manual" at all... even if I match the AUTO settings (or even loosen the timings) the system will fail to boot.

Anything besides AUTO bios timings = can't boot. Voltage and FSB.DRAM ratio can be set manually without any issues. If I take out the two Corsair DIMMs and use my old 2x2 G.Skill kit, I don't have this problem and the timings can be set manually.
post #6 of 9
Try flashing bios if newer one available
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Intel Core 2 Quad Q9650 Asus P5E Sapphire 4850 2GB And 4870 1GB SilentEfficiency CF 8GB Kingston 1066Mhz 
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My System
(13 items)
 
  
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Intel Core 2 Quad Q9650 Asus P5E Sapphire 4850 2GB And 4870 1GB SilentEfficiency CF 8GB Kingston 1066Mhz 
Hard DriveOptical DriveOSPower
Western Digital 1TB 2x Liteon DVD-RW Windows 7 Ultimate 64bit OCZ Z Series 1000W 
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Antec 1200 
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post #7 of 9
Thread Starter 
I already have the latest one. Do you think it's more to do with the motherboard than the memory? Some compatibility problem perhaps?
post #8 of 9
See my post above.
post #9 of 9
Thread Starter 
Quote:
Originally Posted by xd_1771 View Post
See my post above.
I pointed out in my reply that I'm only using 2 sticks at the moment (the Corsairs) <_< The inability to manually set timings (even if they're slower than the rated speeds) only applies to the Corsair memory. If I take them out and put in my old G.Skill memory again everything works normally.

Edit: I basically told myself "to hell with it" and tried something random... put in the 2 Corsair sticks AS WELL as the 2 G.skill sticks (I know, it sounds stupid). I was able to set manual timings and have the system boot. I then turned off the computer, removed the G.skill sticks so that only the Corsair memory was in the system... and now all of a sudden the Corsair sticks are working as they should, and I can set timings manually and actually get into Windows, running at 1600 MHz at 9-9-9-24. This was when resetting the CMOS using the jumper multiple times, etc., did nothing. I'm really confused as to how this solved the problem...

Edit2: Narrowed it down to a certain setting(s) in my BIOS. On fail-safe or optimized defaults, "TRFC0 for DIMM1" and "TRFC1 for DIMM3" were set to 90 ns, while "TRFC1 for DIMM2" and "TRFC3 for DIMM4" were set the 160 ns (these were the banks that my memory was occupying). For some reason, I had to set the first two TRFC values to 160 ns for everything to work, even though the two memory banks are empty. Either that, or the people who wrote the BIOS mixed up the DIMM numbers... I don't see how TRFC values for an empty DIMM slot could do all this.
Edited by Genome852 - 9/9/11 at 9:29pm
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