John Peterson Posted June 15, 2012 Share Posted June 15, 2012 ### Defective RAM One of the RAM sticks in a "2 x 8 GB Corsair XMS3" pack was [faulty](https://www.dropbox.com/sh/6nsbzyzurbh2tj9/httjrrz4da). (The non-faulty 8 GB tests are for the other stick.) Slots A2 and B2 used for 16 GB test, A2 used for 8 GB test. The sticks are marked "10220755 122009084 CMX16GX3M2A1600C11" and "10220756 122009084 CMX16GX3M2A1600C11", the later is faulty. The failed tests are * Test 4 [Moving inversions, ones&zeros, Parallel] * Test 6 [Moving inversions, random pattern] * Test 9 [Random number sequence]) ### Question With so many tests failing how is it possible that it passed the factory test? Are all sticks tested or only a sample? If only a sample, what share of the sticks are tested? Can the RAM degrade after shipment? If so how old are these sticks (determined by their number)? What's the probability that it was caused by exposure to electromagnetic radiation or an electrostatic field after testing? If so how did it only affect one of the sticks in the box? ### System Motherboard: Asus P8Z77-M Pro Link to comment Share on other sites More sharing options...
Wired Posted June 15, 2012 Share Posted June 15, 2012 Did you test one stick at a time in the same slot using Memtest86+ v4.20? Check the connections of the "bad" stick. Is it dirty at all? If so, you can lightly clean the connections with a pencil eraser. Link to comment Share on other sites More sharing options...
John Peterson Posted June 15, 2012 Author Share Posted June 15, 2012 Did you test one stick at a time in the same slot using Memtest86+ v4.20? Yes in slot A2. Check the connections of the "bad" stick. Is it dirty at all? If so, you can lightly clean the connections with a pencil eraser. There are no visible faults on the connectors. If a connector was intermittent a more random pattern would be visible in the test results. In these tests there are patterns, the errors are in a narrow range of around 200 MB, it's always the same bit (0x80000000) that fail in test 4 and 6. Link to comment Share on other sites More sharing options...
peanutz94 Posted June 15, 2012 Share Posted June 15, 2012 With so many tests failing (Test 4 [Moving inversions, ones&zeros, Parallel], Test 6 [Moving inversions, random pattern] and Test 9 [Random number sequence]) how is it possible that it passed your test? Do you test all sticks or only a sample? In case you test a sample, what share of the sticks do you test? Yes , all kit's are tested on a MB at the factory. But as with anything electronic it does happen from time to time. Can the RAM degrade after shipment? If so how old are these particular sticks? No. Using them will cause more damage to them than them sitting on a shelf. s it plausible that it was caused by exposure to electromagnetic radiation or an electrostatics field after testing? If so how did it only affect one of the sticks in the box? Umm, no! Both sticks would have been affected in some way. Besides , computer components are not as touchy as they once were. Most people do not even use static straps working on computers anymore. It used to be in days gone by that it was a real concern. Not so much now. Bottom line is, it happens. No matter the manufacturer. No matter how stringent the testing. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.