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DDR Memory Voltage/overclocking limits

Tatty_Two

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Hi all,
Well, my Mobo fried last week when my PSU erupted (details in specs) and for the first time in ages my new Mobo (Epox 939 NF4 Ultra)when it arrives later this week will have some decent VDimm options, my old Asrock only had a max of 2.7V without the VDimm mod which TBH I never fancied. The Epox will give me up to 3.1V VDimm.

I have a matched pair of Kingston HyperX PC3700 @ DDR467 that at stock run @ 2.6V. Working on the theory that extra voltage can/will give some extra room for overclocking (timings also a consideration of course). They acheive 460Mhz @ 2.5-3-3-7-1T on 2.7V, any faster on these timings and I have to either loosten or drop to 2T.

My question is, realistically how far voltage wise can these be pushed with the current aluminium heatspreaders and perhaps a 80MM fan blowing directly on them, I appreciate that each manufacturer/spec will have different threasholds so to be safe what do people think the highest I should go? Lastly, I more or less know how the differences in timings affect overall performance but am not clear on the size of the differences between 1T and 2T, for example would it be better to have memory running at say 470Mhz 3-3-3-8@1T than say 485Mhz 3-3-3-8@2T?? any advice would be appreciated.
 
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slower speeds at 1t is better.. the cpu speed memory divider thing is all important thow.. dont slow the cpu down just to get better ram timings.. at least not by much..

i dont think more voltage thru the ram makes much difference speedwise.. a little more praps but not enough to cause heat problems..

trog

ps.. i see u have your new sandy at 3 gig.. he he..

ps.. 2.. i think 2t at 1 to 1 would be better then useing the lower divider thow.. or at least the same.. a 2005 or super pi run should show whats best.. not much in it i would think..
 
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Tatty_Two

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slower speeds at 1t is better.. the cpu speed memory divider thing is all important thow.. dont slow the cpu down just to get better ram timings.. at least not by much..

i dont think more voltage thru the ram makes much difference speedwise.. a little more praps but not enough to cause heat problems..

trog

ps.. i see u have your new sandy at 3 gig.. he he..

ps.. 2.. i think 2t at 1 to 1 would be better then useing the lower divider thow.. or at least the same.. a 2005 or super pi run should show whats best.. not much in it i would think..

Cheers Trog, yes got the new Sandy, only had her for 1 night, got her to 3Gig and my PSU blew and took my M/B with it so am on daughters crappy PC until new kit arrives Friday and I can really start to play with it.
 
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Memory 32 gb corsair vengeance 3200
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Benchmark Scores Firestike 29500.. timepsy 14000..
he he he.. nah i shouldnt laff.. it must have been about to happen anyways..

keep us informed..

trog
 

Tatty_Two

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Thing was, it was a decent PSU as well and only 3 months old! Came to the conclusion that the 1800XT is so power hungry, on that second rail with jusy 18Amp combined with all my other stuff in my spec it just had enuff :eek:
 

Azn Tr14dZ

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If you're going to raise the voltage more, don't go too much beyond the manufacturer's recommended. Some companies like OCZ need the extra voltages though 3.5v+, and some companies like DFI offer up to 4.0v for the memory. But it also depends on what type of memory chip it is. On Geil's site, they say the max recommended for the Geil Ultra Platinum (my memory) is 2.95v, but, I got Winbond CH-5, so it needs about 3.3v-3.4v to overclock better. You should check out what type of memory chips you have on your Kingston. I believe they have it here on TPU.
 
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