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Mismatched DDR2 sticks pairs stability tips (ASUS P5B)

post #1 of 5
Thread Starter 
Hey guys, I've been running for quite some time a rig built this way:

Intel Q8200 @ 445*7 (3.12Ghz) - 1.265v
Asus P5B
2x2Gb of Buffalo Select PC2-6400U-555 @ 1.9v - Auto Timings
Cooler Master GX550w PSU
Windows 7

It worked stable and all, and i've deviced to add an extra 2*2Gb of DDR2, the best pick I could have was a pair of matched 2Gb G.Skill Extreme2 PC6400 PK
Now, obviously, I'm getting some serious issues with keeping the same overclock and 2 pairs of mismatched memory sticks.
The same OC with the G.Skill only apparently shows no stability issues.

So far I've been testing all available memory slot configurations for the sticks and I've been hitting a rough wall, anything above 350Mhz will lead me to heavy unstability, BSODs during Windows boot or right to the login page. Weirdly enough, keeping the FSB to 445Mhz allows me to boot Windows and surf on the Internet but would BSOD as soon as I start heavy softwares (After Effects/Cubase).

Is there any tips or memory settings I wouldn't be aware of that could help me get back the compatibility right? I'm suspecting the Auto timings to be messing up with the Buffalo ram as the G.Skills can deal with much tighter timings.


Thanks, Ig

Edit : I have found out that as long as there are 3 sticks, it's stable too ( now it's A1 : Buffalo A2 : Empty B1 : GSkill B2 GSkill)
Edited by Eggehh - 8/7/12 at 8:11am
post #2 of 5
Even without mismatched sticks, it's common for OC capabilities to change with two DIMMs per channel.

Manually setting memory timings should take care of any potential problems from the mismatch. You don't want anything that says auto, manually input everything for the lowest common denominator amongst your DIMMs.

After you find settings that will work with both sets independently, you will still likely need to increase command rate and tRFC, as well as give MCH voltage a bump. Even then you may not be able to reach the same FSB with four DIMMs as you could with 2 or 3.

I would also recommend getting a rough idea of memory stability before booting into windows. Flaky memory is one of the fastest ways to corrupt an OS install.
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post #3 of 5
Thread Starter 
Interesting, thanks. I was about to start working with Memtest for the timings, got some bad winload corruptions in the past that I can't afford now. I think I'm gonna be stuck at some point anyway, there's no MCH voltage setting with the regular P5B. There's just one thing that bothers me, beyond the regular 5 timing things I've got a couple of extra options I don't know what to do with them
post #4 of 5
That Buffalo select is rated at DDR2-800 5-5-5, and as far as those sub timings, I can tell you that setting everything to 10 certainly isn't optimal.

Try starting with these, in order, going down the list: 5-5-5-15 7-60-5-5-5-7

Static read control is a chipset timing that depends on FSB, memory ratio, and CAS. It can probably be left on AUTO for now, but once you figure out what it's being set to, adding one to that figure may help stabilize a higher FSB with this amount of memory.

Regarding voltages, MCH voltage may be called NB vcore. Also, increasing FSB termination voltage may help as well.
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Windows 7 Professional x64 SP1 BenQ BL3200PT Filco Majestouch Tenkeyless (MX Brown) Corsair RM1000x 
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Fractal Design Define R4 Logitech G402 Realtek ALC1150 + M-Audio AV40 
CPUMotherboardGraphicsRAM
X5670 @ 4.4/3.2GHz core/uncore, 1.36 vcore, 1.2... Gigabyte X58A-UD5 r2.0 w/FF3mod10 BIOS Reference R9 290X w/Stilt's MLU 1000e / 1375m E... 2x Samsung MV-3V4G3D/US @ 2000, 10-11-11-30-T1,... 
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CoolingOSPowerCase
Noctua NH-D14 Windows 7 Pro x64 SP1 Antec TP-750 Fractal Design R5 
Audio
ASUS Xonar DS 
CPUMotherboardGraphicsRAM
i7-6800K @ 4.3/3.5GHz core/uncore, 1.36/1.2v ASRock X99 OC Formula (P3.10) GTX 780 (temporary) 4x4GiB Crucial DDR4-2400 @ 11-13-12-28-T2, 1.33v 
Hard DriveHard DriveCoolingOS
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Seasonic SS-860XP2 Corsair Carbide Air 540 
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In progress
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CPUMotherboardGraphicsRAM
5820K @ 4.3/3.6GHz core/uncore, 1.225/1.2v Gigabyte X99 SOC Champion (F22n) 2x Sapphire R9 290X Tri-X OC New Edition (10036... 4x4GiB Crucial @ 2667, 12-11-12-27-T1, 1.37v 
Hard DriveHard DriveHard DriveCooling
Plextor M6e 128GB (fw 1.05) M.2 (PCI-E 2.0 2x) 2x Crucial M4 256GB 4x WD Scorpio Black 500GB Cooler Master Nepton 280L 
OSMonitorKeyboardPower
Windows 7 Professional x64 SP1 BenQ BL3200PT Filco Majestouch Tenkeyless (MX Brown) Corsair RM1000x 
CaseMouseAudio
Fractal Design Define R4 Logitech G402 Realtek ALC1150 + M-Audio AV40 
CPUMotherboardGraphicsRAM
X5670 @ 4.4/3.2GHz core/uncore, 1.36 vcore, 1.2... Gigabyte X58A-UD5 r2.0 w/FF3mod10 BIOS Reference R9 290X w/Stilt's MLU 1000e / 1375m E... 2x Samsung MV-3V4G3D/US @ 2000, 10-11-11-30-T1,... 
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1x Crucial BLT4G3D1608ET3LX0 @ 2000, 10-11-11-3... OCZ (Toshiba) Trion 150 120GB Hyundai Sapphire 120GB 3x Hitachi Deskstar 7k1000.C 1TB 
CoolingOSPowerCase
Noctua NH-D14 Windows 7 Pro x64 SP1 Antec TP-750 Fractal Design R5 
Audio
ASUS Xonar DS 
CPUMotherboardGraphicsRAM
i7-6800K @ 4.3/3.5GHz core/uncore, 1.36/1.2v ASRock X99 OC Formula (P3.10) GTX 780 (temporary) 4x4GiB Crucial DDR4-2400 @ 11-13-12-28-T2, 1.33v 
Hard DriveHard DriveCoolingOS
Intel 600p 256GB NVMe 2x HGST Travelstar 7k1000 1TB Corsair H55 (temporary) Windows Server 2016 Datacenter 
PowerCase
Seasonic SS-860XP2 Corsair Carbide Air 540 
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post #5 of 5
Thread Starter 
Cheers for all these infos. After a couple of tests I think I've hit the maximum that the memory controller can bear, I'll stay with 3*2Gb as I really can't afford to put the FSB lower (some of my Cubase projects are on the verge of maxing out the CPU charge). A full memtest86+ pass showed me bazillions of errors on test 5 and only this test, which doesn't happen when only three sticks are in.
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