LilKarma Posted May 22, 2005 Share Posted May 22, 2005 I have an Intel D865PERL motherboard and purchased 2 TwinX1024-3200C2PT looking for a total of 2gb. Put them in and the computer wouldn't boot. Took them out put in old ram and it was fine. Tried each stick one at a time and all 4 worked fine. Ran Memtest on each and they all look good. But as soon as I get a pair in the system would become unstable. As intel belives raising the mem voltage is only necessary to oveclock, not to run much of today's low latency ram, I can't do anything with that. Even when I allow the board to read it's own latency settings, 8-3-3-2.5 I can't get the system stable with 2 sticks, and the problem becomes even worse with all 4. I do have a lot of drives, but nothing the ps shouldn't handle (it's a 550w.) I tried plugging into another PS (400 watt, desktop type) with much lower amperage ratings on all voltages and it only made the problems worse. I unplugged all io cards and drives and memtest still finds errors when working with more than just one dimm. Any ideas on what to try? Here are my system specs: Antec Titan 550 server/worstation case (550watt) so the PS should be stable. Intel D865PERL mobo Adaptec 2410SA raid card (4 250gig sata drives) Radeon 8500AIW Aardvark aark24 soundcard 2 dvd optical drives Thanks! Link to comment Share on other sites More sharing options...
dhc0329 Posted May 22, 2005 Share Posted May 22, 2005 Do all these RAM have same version numbers? Corsair said although the part number's same if version numer's different, they can't support it. This almost sounds like they can't support the upgrade..as the version # changes within few months. Link to comment Share on other sites More sharing options...
LilKarma Posted May 22, 2005 Author Share Posted May 22, 2005 Yeah all the same version numbers, XMS3202v1.5 All from the same lot too: 0519066-3. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted May 23, 2005 Corsair Employees Share Posted May 23, 2005 Please make sure that you have the latest bios and then load setup defaults and set the following settings and test the modules one at a time with http://www.memtest.org and lets make sure one is not failing! Dim Voltage 2.7 Volts CAS Latency CL=2.5 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 6 Row Precharge Time tRP 3 Write Recovery Time Bios Default Write to Read delay Bios Default Read to Write Delay Bios Default Refresh Period tREF Bios Default Link to comment Share on other sites More sharing options...
LilKarma Posted May 23, 2005 Author Share Posted May 23, 2005 Already updated the bios, I re-tested each module individually with those exact settings, of course I can't change the dim voltage to 2.7, all 4 dimms work fine as singles. As soon as I put in two, get errors on test #5. -Thanks Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted May 23, 2005 Corsair Employees Share Posted May 23, 2005 With all 4 modules please load setup defaults and let the bios set the timings and run http://www.memtest.org and please make sure that you have the latest bios before you load setup defaults. Link to comment Share on other sites More sharing options...
LilKarma Posted May 24, 2005 Author Share Posted May 24, 2005 ok, loaded the bios defaults, let the board auto-detect, and all the sticks look fine by themselves, put them in as a pair and no go, lots of errors on test #5. The bios chooses 2.5-3-3-8. Link to comment Share on other sites More sharing options...
LilKarma Posted May 24, 2005 Author Share Posted May 24, 2005 Also two sticks at the same time work so long as they are not in dual channel mode. Link to comment Share on other sites More sharing options...
LilKarma Posted May 24, 2005 Author Share Posted May 24, 2005 Also interesting is the memory works great at 333mhz, so is it just an issue that your ram requires greater than 2.5V to work at the rated frequency? Link to comment Share on other sites More sharing options...
LilKarma Posted May 25, 2005 Author Share Posted May 25, 2005 Ok, for anyone with similar issues, here's as close to a complete solution as I found. The Intel boards which are based on the 865 chipset are not able to change their memory voltage; thanks Intel! But with a good powersupply, the TwinX1024-3200C2 should be just hovering under effectiveness running in DDR400. So you gotta slow down the clock to the memory somehow. In the bios goto burn-in mode and set the processor to -2% this will yeild a clock rate of 196mhz per stick, or overall 392ddr. Hopefully this will work. Note you may have to let the bios detect, or set a higher cas timing manually, as it's teetering on the edge of stability. (My board detects 2.5-3-3-8.) The other option is to come at the highest clock rate you can from the other direction, set the memory frequency to be 320mhz and go back to the burn in and set the processor to +4% this time. This will be a lot slower, putting the DDR right about 333mhz, but should gurantee stability. Also if you gotta go this route you can probably run lower timings, the full rated 2-3-3-6. Good luck! Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted May 25, 2005 Corsair Employees Share Posted May 25, 2005 That would suggest a problem with power either on the MB or the PSU. I would maybe try and see if the reseller will let you exchnage these modules for 1 Twinx2048-3200 instead. Link to comment Share on other sites More sharing options...
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