descenterace Posted November 13, 2005 Share Posted November 13, 2005 I bought a set of 2x512MB TWINX-XMS4400C25PT modules from overclockers.co.uk a couple of months ago. The pair seemed to work fine with my old Abit AV8, but in the new rig (desc. below) I got a BSOD while installing WinXP. Memtest86+ v1.5 showed up several faults with the RAM running in both single- and dual-channel mode, in any pair of slots. Command rates of 1T and 2T with standard 2.5-4-4-8 timings were tested, at 200MHz 1.75V. This RAM has not yet been overclocked, but RMAing it to overclockers.co.uk may prove difficult since I no longer have the original box. This system was tested with another pair of DIMMs (standard PC2700 running in single-channel mode) and checked out, so the fault almost certainly lies with the TWINX DIMMs. AMD X2 4200 Abit AN8 Ultra GeForce 7800 GTX 80GB ATA disk 200GB SATA disk 550W Antec TruPower CM Stacker Custom hybrid air/water cooling system including CM crossflow fan, ensuring adequate RAM cooling Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted November 14, 2005 Corsair Employees Share Posted November 14, 2005 Can you tell me the bios settings you have set for both CPU and memory and any performance settings that you may have set? Link to comment Share on other sites More sharing options...
descenterace Posted November 16, 2005 Author Share Posted November 16, 2005 Both are set to defaults: CPU Core: 1.35V DDR SDRAM Voltage: 2.75V DDR VTT Voltage: 1.35V (DDR/2) DRAM Timings: Auto DRAM Freq: 200MHz After the first crash I tried setting the RAM command rate to 2T, which seemed to improve stability but Memtest still reported lots of errors. Testing the DIMMs individually, only one appears to be faulty. The other is fine. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted November 16, 2005 Corsair Employees Share Posted November 16, 2005 With this MB and CPU I would suggest you set the Rass to Cass to "3" so I would set these timings and then set the Dim Voltage to +2.8 Volts: CAS Latency CL=2.0 Row Cycle Time tRC Bios Default Row Refresh Cyc Time tRFC Bios Default Ras# to CAS# delay tRCD 3 Row to Row delay Bios Default Min Ras# Active Time tRAS 11 Row Precharge Time tRP 2 Write Recovery Time Bios Default Write to Read delay Bios Default Read to Write Delay Bios Default Refresh Period tREF Bios Default Enable 2T Timing Disabled Then test the system with http://www.memtest.org and make sure it's stable! If you have problems, I would set Enable 2T Timings to AUTO and test it again! Link to comment Share on other sites More sharing options...
descenterace Posted November 21, 2005 Author Share Posted November 21, 2005 Finally had time to test these today... Still getting errors. More than before in fact. Time to RMA, I think. Thanks for the help! Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted November 21, 2005 Corsair Employees Share Posted November 21, 2005 Please see the link in my signature, "I think I have a bad part what do I do?" and we will be happy to replace the set for you. Link to comment Share on other sites More sharing options...
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