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Bad 6400 C5 Module ?


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Please can you tell me whether this RAM is RMA'able please:


I have 2x1 gig modules, with a E6600 Conroe + P5B Deluxe mobo


@ 2.88 gig overclock - with RAM divider set to 4:5 - ie memory at 800 MHz, manually set to 5-5-5-15 @ either AUTO VDimm or 1.9 VDimm or 1.95V VDimm I get Orthos errors (lasts 20 seconds !) and Memtest errors. Its so unstable in windows it will periodically just completely reboot.


Memtest ... Test 3 Pass 0 Address 0003C0CC1fc - 960.7MB


test sometimes fails on different tests, but seems to always be @ 960.7MB



@ no CPU overclock, with RAM divider set to 1:1 memory 800Mhz - no errors (although have yet to leave it overnight)



I know its definately not the CPU as if I drop the divider to 1:1, and go to 700MHz CAS4 on the RAM @ 1.95V it passes several hours of memtest and also Orthos - and this is with CPU @ 3.15 gig.


700MHz CAS4 is quite an overclock of the RAM really, it just doesn't seem to like 800MHz or above @ higher fsbs.


A collleague at work has exact same system, same RAM modules same processor (even same week) - and his is fine.


<UPDATE> - Orthos only stable for 9 minutes at stock CPU speed, and stock RAM speed :( - ie 2.4 gig, 2:3 RAM, and RAM at SPD settings - 5-5-5-18 @ DDR 800...


<UPDATE 2> Ran Memtest while I was at work this morning (5 hours), stock everything, and it came up with 7 failures, all in test 7 on different runs, but all on same "bit" of memory space.


Any ideas please ?


thanks, Best Regards,



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Please load setup defaults and then set the Dim Voltage to 2.1 volts (+.2 Volts W/Giga-Byte) and set the timings to the tested settings and then test the module/modules one at a time with http://www.memtest.org! If you still get errors, please follow the link in my signature “I think I have a bad part!” and we will be happy to replace them or it! However, if you get errors with both modules that would suggest some other problem and I would test them in another system or MB to be sure. In addition, with this MB you have to disable legacy USB in the bios when running any memory test.
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hi there - my modules are PROMOS - and I don't think they'll take 2.1V will they ? If I set VDimm to 2.1V at any clockspeed they fall over like a sack of spuds, won't even do 2 seconds in Orthos ... I read somewhere (one of your support guys I think) - that the max these will take is 1.95V ?


I think I may have cured the problem though, by changing the Write to Precharge from Asus default from 10-15 ... although why it wasn't a problem before I don't know - but after changing did 6 hours in memtest without a problem.


cheers, Mark.

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