scifiman Posted December 16, 2004 Share Posted December 16, 2004 As seen in the title, I have a foxconn 755a01 motherboard (now known as k8s755a) It is an athlon64 motherboard with many great features. I have a single stick of 512Mb Corsair VS512MB400 (CAS 2.5) with an athlon64 2800+ and it runs like a champ at DDR400. I recently got another stick of the exact same stuff - Corsair VS512MB400 and now, with both sticks in, it only reaches DDR333. I've tried the ram in all combinations in the 3 dimm sockets. Each stick by itself run at DDR400 just fine, but not both together. According to Foxconn's (foxconnchannel.com) motherboard manual and from there tech support, the only thing that will prevent two sticks of ram from not running at 400 is if both sticks are configured as x8 double rank. I'm not sure what exactly that means but i think thats talking about the layout of the chips on the pcb. The ram does have 16 chips but is it x16 single or x8 double? If it is x8 double then i guess i'll live with ddr333, hey i still have a gig of it right! :biggrin: but if there is anyway to make this run faster, i'll take any suggestions. There aren't many bios options to tweak, so its either going to be the ram or the motherboard thats the problem and the mb has the latest bios on it. Link to comment Share on other sites More sharing options...
Yellowbeard Posted December 16, 2004 Share Posted December 16, 2004 IIRC, by default those MOBOs default to DDR333 with 2 DS sticks of RAM, which is what you have. Is there a way to manually set the FSB and RAM speed in the bios? If so, that may resolve this. Many of the other MOBOs that do that state that they will not "officially" run at DDR400 with 2 DS sticks of PC3200 but, many times they will when set manually. Mike. Link to comment Share on other sites More sharing options...
scifiman Posted December 16, 2004 Author Share Posted December 16, 2004 According to this chart from the manual, with two x8 double rank sticks it will only run at 166x2. Are the value select sticks x8 DR or are they x16? How do you tell? Does double rank simply mean double-sided? If so, then the highest it can do is 333. As far as the bios goes, the highest I can manually select is 166 or auto. I can also change other timings and latencies but there are NO voltage settings for ram. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted December 16, 2004 Corsair Employees Share Posted December 16, 2004 Well all of our modules at this time should be made with By 8 memory IC's and 512 Meg modules and larger would be double sided. So according to what you have posted the MB is running the memory correctly. Now that’s not to say you might be able to set the memory frequency manually to DDR400, but I would suggest they be in slots 1-3 or 2-3 and you should set the Dim Voltage to 2.7 Volts as well. But I would test the system with http://www.mmtest.org to make sure the settings are stable. Link to comment Share on other sites More sharing options...
scifiman Posted December 16, 2004 Author Share Posted December 16, 2004 Well all of our modules at this time should be made with By 8 memory IC's and 512 Meg modules and larger would be double sided. So according to what you have posted the MB is running the memory correctly... Thanks for the reply - so x8 double rank simply means 8 chips per side. Makes sense but I wasn't sure because they (foxconn) used the phrase "double rank". It seems like the manual made it harder to figure out than it should have been. Your right then, the modules are running at the speed they're supposed to be running at. Unfortunately there are very few settings in bios to tweak for the ram (no voltage settings at all!!!). Thanks for the help guys!!! Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted December 17, 2004 Corsair Employees Share Posted December 17, 2004 No not always. By 8 in this term would be the actual IC organization not the way they are built on the module. That is 2 totally differnt things with memory. VS512MB400 should run great with this system. Link to comment Share on other sites More sharing options...
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