e47612 Posted January 28, 2008 Share Posted January 28, 2008 Hi, Per my request for an RMA (Case No. 419248) "I bought two matched pairs and was getting infrequent BSOD's. I've ran the Vista Memory Diagnostics program and got errors detected. I downloaded Memtest+86 Ver. 1.70 (and disabled legacy USB in the BIOS) and tested all four of the modules individually and one came up with errors. I put in the unnaffected matched pair and that tested OK." As a result, I submitted a request for an RMA. I subsequently changed the BIOS settings to Corsair's recommended for the module and got the same results. However, I happenned to glance upon the post for Asus P5B-X boards, which recommended the voltage be upped to 2.1 V. I've done this, put the faulty module in and lo and behold it now tests OK. What does that mean? Is the module faulty or not? It will only run at 2.1 V, whereas the other modules are happy to run at 1.9 V. Are there any long term effects of running the system at 2.1 V? Regards, Alastair Link to comment Share on other sites More sharing options...
e47612 Posted January 28, 2008 Author Share Posted January 28, 2008 Further to my last post. I've now got four modules in at 2.1 V and memtest comes up with errors, whereas 3 at same voltage gave no errors. Also, the extra module was the one that tested OK of the matched pair. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted January 29, 2008 Corsair Employees Share Posted January 29, 2008 Please set the Write to precharge Delay to 15 and the other timings manually and set the memory Voltage to 2.0 Volts and test the suspect modules one at a time with memtest.org. Link to comment Share on other sites More sharing options...
e47612 Posted January 29, 2008 Author Share Posted January 29, 2008 Ramguy, I've checked them individually at 2.0 V and it's the same as for 2.1V, i.e. all the chips check out OK individually, and they are OK with 3 slots occupied, but as soon as I put the 4th RAM chip in, memtest goes ape. However, as soon as I drop the volatge to 1.9 V or Auto, only the one chip fails individually (Flakey chip). I wish I had one extra chip which passes at 1.9V, to see if the weakest chip(Flakey chip), is what's preventing me from running four with no errors. What's Corsair's opinion on the one that fails at 1.9V, is it defective or not? I'd hate to RMA it, get a new chip which passes Memtest at 1.9 V, but I still get memtest failing when all four slots are occupied. Funnily enough, when I do get failures in Memtest, the memory range of the failures is always in the half with the Flakey chip. Can memetest identify which DIMM is failing? PS: I'm running 5-5-5-12 latencies at the moment, should I ease this out to 5-5-5-15 or 5-5-5-18 to see if I can get all four chips to run without failures? Alastair Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted January 29, 2008 Corsair Employees Share Posted January 29, 2008 With 4 modules in this board you would need to set the memory frequency manually to DDR667 due to limitations of the memory controller. If all 4 modules are passing when individually tested at 2.0-2.1 volts then there may not be a faulty module. If you are only having problems when you have all four modules installed, then I would definitely recommend lowering the memory frequency to 667MHz and see if you are having the same problems. Link to comment Share on other sites More sharing options...
e47612 Posted January 30, 2008 Author Share Posted January 30, 2008 If all 4 modules are passing when individually tested at 2.0-2.1 volts then there may not be a faulty module. Given the modules in question have been tested at 1.9V and that's Corsair's recommended setting, wouldn't the failure of one only module out of four at 1.9V indicate the one failing is faulty? Link to comment Share on other sites More sharing options...
e47612 Posted January 30, 2008 Author Share Posted January 30, 2008 With 4 modules in this board you would need to set the memory frequency manually to DDR667 due to limitations of the memory controller. If all 4 modules are passing when individually tested at 2.0-2.1 volts then there may not be a faulty module. If you are only having problems when you have all four modules installed, then I would definitely recommend lowering the memory frequency to 667MHz and see if you are having the same problems. I dropped it to 667 MHz (latencies per Corsair recomendations) and I get the same results as with 800 MHz. Individual tests at 1.9 V, 3 Chips OK, 1 Chip Fail. Individual tests at 2.0 V, 4 Chips OK. All 4 chips at same time test at 2.1 V, Fail. And the failure is in the half of the memory where the faulty chip is. What more can I do to demonstrate I have a faulty chip? Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted January 30, 2008 Corsair Employees Share Posted January 30, 2008 I apologize, I misread which part you had, the 6400 is definitely tested at 1.9, the 6400C4 is tested at 2.1. Let's get them replaced, please use the On Line RMA Request Form and we will be happy to replace them. Link to comment Share on other sites More sharing options...
e47612 Posted February 19, 2008 Author Share Posted February 19, 2008 Hi, Just to let you know the replacement matched pair turned up in the post. I put them in, with the other matched pair (4 x 1 Gb) and Memtest ran with no errors for one full pass. Thanks Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted February 19, 2008 Corsair Employees Share Posted February 19, 2008 Thanks for the update, glad to hear everything is running well! Link to comment Share on other sites More sharing options...
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