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EPoX 9NDA3+ and TWINX1024-4400C25:warranty of great performance?


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Firstly, I'd like to apologize for my poor english and enormous post.


I have an EPoX 9NDA3+ and there are some doubts towards the use of TWINX1024-4400C25 (DDR-550 / 2.5-4-4-8) which I'd like you to clarify.


In fact, I intend to change my memory modules described in my signature because I've noticed that they don't really work well at 1T on the 9NDA3+ rev. 2.x when overclocking. I've tested them with other motherboards, used memtest86 to scan for errors and, indeed, they don't have any problem. At default settings (2-2-2-5-1T), without overclocking the system, these memory sticks work perfectly. Although, when I overclock the processor, it doesn't matter how many Mhz I increase, even with the RAM working at default settings or, even more, underclocking the sticks, the system sometimes doesn't boot. That is to say, as described in the 9NDA3+ user's guide, I have no video signal, which means an unsuccessfull overclock.


Changing the Command Rate to 2T, when I overclock the system I face no issue. So, my first doubt was: does the 9NDA3+ rev.2.x have any problem with memory working at 1T? I'm almost sure it doesn't, and maybe it's a problem of compatibility because a friend of mine, who has the same mobo, same processor and a pair of "XXX" RAM has no problem at all. Even with my old XXXXXXXXX Value DDR333 I haven't had that problem.Also, I'm considering the lack of BrainPower PCB in these memory modules the main reason for the problem described, although they're equipped with Samsung TCCD chips.


As I've worried about the problem, I've decided to find out which memory modules would work best in the 9NDA3+ rev 2.x and, in the USA EPoX site (http://www.epox.com/USA/article.asp?ID=1824&showsupportlinks=YES), as well as in Corsair Memory Guide (http://compatible.corsairmemory.com/memorysearch.aspx?modelid=602) I've seen that TWINX1024-4400C25 is recommended.


The Corsair TWINX1024-4400C25(DDR550), 1Gb kit, has interested me, but something has called my attention. As they're DDR550 modules, they work at 275Mhz with default settings and, as I've searched in some reviews about it, these Corsair modules work also as DDR400 (e.g., http://www.anandtech.com/memory/showdoc.aspx?i=2312&p=1). As my interest is really to find a memory kit that works 1:1 with HTT when overclocking, at 1T command rate, I think that theses corsair modules are what I've been looking for, mainly because they have Brain Power PCB and are equipped with TCCD chips.


Currently, my processor is running, with default vcore, @3500+, that is to say, a 3000+, 1.8Ghz, working as a 3500+, 2.2Ghz. Here, I've ever been able to set 275x9 (~2.4Ghz), without any vcore increment or any error in Prime95 or OCCT. The mentioned KHX modules are working as DDR490 without any problem, but, as I said, they don't work at 1T, what is really strange because, as far as I know, the memories with TCCD chips usually run as DDR500 at 1T with 2.8v (of course with relaxed timings).


So, considering that I'm looking for a pair of good modules (read it = TCCD + BrainPower) which work at least as DDR500 at 1T, I'd like to know if that TWINX1024-4400C25 (DDR550), 1Gb kit, would be able to do that. Obviously, if these DDR550 modules are recommended for the 9NDA3+, surely they must work without any issue with default settings (DDR550, 2.5-4-4-8, 2.75v), am I right? In other words, do you know if TWINX1024-4400C25(DDR550) has any problem running in Dual Channel with 1T Command Rate on the EPoX 9NDA3+?




P.S.: I'm really happy to take part of this forum.

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