Jimbo Mahoney Posted June 8, 2005 Posted June 8, 2005 Hey guys, There's some discussions over at XS about Tref and one pointed back here explaining the relationship between Tref, memory clock and refresh time. I made a small excel spreadsheet which needs testing. Just input your memory stick size and memory speed in Mhz and it should give you the theoretical ideal Tref: http://homepage.ntlworld.com/james.waynewright/Tref.xls Let me know how it goes. Quote Share this post Link to post Share on other sites More sharing options...
OldGuy Posted June 8, 2005 Posted June 8, 2005 Hey guys, There's some discussions over at XS about Tref and one pointed back here explaining the relationship between Tref, memory clock and refresh time. I made a small excel spreadsheet which needs testing. Just input your memory stick size and memory speed in Mhz and it should give you the theoretical ideal Tref: http://homepage.ntlworld.com/james.waynewright/Tref.xls Let me know how it goes. Think there would be any difference between the NF3 and the NF4 for your formula??? Either way I'll try it when I get home tonight... Quote Share this post Link to post Share on other sites More sharing options...
Jimbo Mahoney Posted June 8, 2005 Posted June 8, 2005 Don't think so. Quote Share this post Link to post Share on other sites More sharing options...
WheresWaldo Posted June 8, 2005 Posted June 8, 2005 Jimbo, The numbers you get for 512MB sticks are suprisingly close to how I calculate Tref Your formula = (4/MEM)/(1/FSB)*1000. How was this arrived at and does the XS thread mention anything about refresh rate for particular sticks. The formula that has been discussed on this forum is REFRESH/(1/FSB). Many sticks have and SPD refresh rate of 7.8us so the math with yours worked out for sticks of 512MB @ 200 are (4/512)/(1/200)=1563, the formula I am using taking into account refresh is 7.8/(1/200)=1560, but if the RAM was built to refresh significantly faster, let's say 3.9us then you still come up with 1563 and my results show it should be 780. Just curious. Quote Share this post Link to post Share on other sites More sharing options...
Jimbo Mahoney Posted June 8, 2005 Posted June 8, 2005 Sorry, so far I've just assumed for a 128Mbit stick (256MB) that it has a default refresh of 15.6 us. For a 256Mbit stick (512MB), 7.8us. etc etc. If you can improve the formula, please do! I've changed the spreadsheet so you can input your refresh period if you know it. Download it again and take a look. Quote Share this post Link to post Share on other sites More sharing options...
OldGuy Posted June 8, 2005 Posted June 8, 2005 Sorry, so far I've just assumed for a 128Mbit stick (256MB) that it has a default refresh of 15.6 us. For a 256Mbit stick (512MB), 7.8us. etc etc. If you can improve the formula, please do! I've changed the spreadsheet so you can input your refresh period if you know it. Download it again and take a look. Keep tinkering and by the time I get home tonight you'll have the magical mystery tref formula that lets me run both my sticks of memory at 300mhz 1:1 1T @ 2-2-2-5 timings :nod: Quote Share this post Link to post Share on other sites More sharing options...
Jimbo Mahoney Posted June 8, 2005 Posted June 8, 2005 I already know it, but I'm not telling anyone j/k Quote Share this post Link to post Share on other sites More sharing options...
Jimbo Mahoney Posted June 9, 2005 Posted June 9, 2005 OK, with active cooling and a theoretical ideal Tref, I'm memtest #5 stable and 10 hours so far with Large FFTs in Prime @ 235 Mhz 2-2-2-6 1T. Before, I only managed 217 Mhz Prime stable. Quote Share this post Link to post Share on other sites More sharing options...
Portugal Posted June 9, 2005 Posted June 9, 2005 i dont understand some things,i have 2x512 in duall channel,so what value to use?512 or 1024?and the memory speed?i have to put the default speed from mem or the speed that i use? Quote Share this post Link to post Share on other sites More sharing options...
Sharp Posted June 9, 2005 Posted June 9, 2005 Hello, Portugal, if you are not overclokcing leave the frequency/fsb on 200Mhz. And leave the tREF on AUTO. There are a few posts that will help explain the tREF value. http://dfi-street.com/forum/showthread.php...finitive+answer This is the one that Jimbo is talking about. Quote Share this post Link to post Share on other sites More sharing options...
bread Posted June 9, 2005 Posted June 9, 2005 We put speed of the memory, not the divider speed right? ie for me: I am running 10 x260 with a 9/10 divider on my 512 sticks giving me 236 Makeithurtz on the memory. So according to your flux capacitor calculations, I should select the Tref value that is closest to 1843.75 without going under? Quote Share this post Link to post Share on other sites More sharing options...
Sharp Posted June 9, 2005 Posted June 9, 2005 Hello, Yes always use the Memory frequency. Anything near 1843, a bit higher or lower. I have registered in the XS forum, need to wait a bit before I can post. I would like to know if it makes a difference. Quote Share this post Link to post Share on other sites More sharing options...
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