• Welcome to TechPowerUp Forums, Guest! Please check out our forum guidelines for info related to our community.

DDR Memory Voltage/overclocking limits

Tatty_One

Super Moderator
Staff member
Joined
Jan 18, 2006
Messages
19,834 (4.52/day)
Likes
6,125
Location
Worcestershire, UK
Processor Skylake Core i7 6700k @ 4.6gig
Motherboard MSI Z170A Tomahawk
Cooling Cooler Master Seidon 240V AIO/Viper140's
Memory 16GB Corsair Vengeance LPX 3000mhz CL14
Video Card(s) Sapphire 4gb R9 290X VaporX @1150mhz
Storage SkHynix SL308 120GB/CrucialM4/1TB WD Black
Display(s) LG 29inch 2560x1080 Curved Ultrawide IPS
Case Phanteks Enthoo Pro M Windowed - Gunmetal
Audio Device(s) Xifi Elite Pro 7.1/VideoLogic ZXR550's
Power Supply XFX Pro Black Edition 750W Gold modular
Keyboard CM Storm Octane Combo
Software Win 10 Home x64
#1
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.
 
Joined
Dec 18, 2005
Messages
6,112 (1.38/day)
Likes
882
System Name money pit..
Processor Intel 7700K at 4800 mhz.. vcore 1.280 volts..
Motherboard Asus rog Strix Z279F Gaming
Cooling Dark Rock TF air cooler.. Stock vga air coolers with case side fans to help cooling..
Memory 32 gb corsair vengeance 3200
Video Card(s) Palit Super Jetstream 1070 x 2..
Storage Three.. all solid state 128 Transend.. 1 T Sandisk.. 1 T Transend.. plus USB external..
Display(s) 27" Asus PG279Q ROG Swift 165Hrz Nvidia G-Sync, IPS.. 2560x1440..
Case Gigabyte mid-tower.. cheap and not really big enough for what is inside..
Audio Device(s) USB Sound blaster Roar 2 all in one unit with bluetooth
Power Supply EVGA 850 watt..
Mouse Logitech G700s
Keyboard Logitech K270
Software Win 10 pro..
Benchmark Scores 3Dmark Firestrike Ultra 8542.. Timespy 10508.. everyday settings..
#2
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..
 
Last edited:

Tatty_One

Super Moderator
Staff member
Joined
Jan 18, 2006
Messages
19,834 (4.52/day)
Likes
6,125
Location
Worcestershire, UK
Processor Skylake Core i7 6700k @ 4.6gig
Motherboard MSI Z170A Tomahawk
Cooling Cooler Master Seidon 240V AIO/Viper140's
Memory 16GB Corsair Vengeance LPX 3000mhz CL14
Video Card(s) Sapphire 4gb R9 290X VaporX @1150mhz
Storage SkHynix SL308 120GB/CrucialM4/1TB WD Black
Display(s) LG 29inch 2560x1080 Curved Ultrawide IPS
Case Phanteks Enthoo Pro M Windowed - Gunmetal
Audio Device(s) Xifi Elite Pro 7.1/VideoLogic ZXR550's
Power Supply XFX Pro Black Edition 750W Gold modular
Keyboard CM Storm Octane Combo
Software Win 10 Home x64
#3
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.
 
Joined
Dec 18, 2005
Messages
6,112 (1.38/day)
Likes
882
System Name money pit..
Processor Intel 7700K at 4800 mhz.. vcore 1.280 volts..
Motherboard Asus rog Strix Z279F Gaming
Cooling Dark Rock TF air cooler.. Stock vga air coolers with case side fans to help cooling..
Memory 32 gb corsair vengeance 3200
Video Card(s) Palit Super Jetstream 1070 x 2..
Storage Three.. all solid state 128 Transend.. 1 T Sandisk.. 1 T Transend.. plus USB external..
Display(s) 27" Asus PG279Q ROG Swift 165Hrz Nvidia G-Sync, IPS.. 2560x1440..
Case Gigabyte mid-tower.. cheap and not really big enough for what is inside..
Audio Device(s) USB Sound blaster Roar 2 all in one unit with bluetooth
Power Supply EVGA 850 watt..
Mouse Logitech G700s
Keyboard Logitech K270
Software Win 10 pro..
Benchmark Scores 3Dmark Firestrike Ultra 8542.. Timespy 10508.. everyday settings..
#4
he he he.. nah i shouldnt laff.. it must have been about to happen anyways..

keep us informed..

trog
 

Tatty_One

Super Moderator
Staff member
Joined
Jan 18, 2006
Messages
19,834 (4.52/day)
Likes
6,125
Location
Worcestershire, UK
Processor Skylake Core i7 6700k @ 4.6gig
Motherboard MSI Z170A Tomahawk
Cooling Cooler Master Seidon 240V AIO/Viper140's
Memory 16GB Corsair Vengeance LPX 3000mhz CL14
Video Card(s) Sapphire 4gb R9 290X VaporX @1150mhz
Storage SkHynix SL308 120GB/CrucialM4/1TB WD Black
Display(s) LG 29inch 2560x1080 Curved Ultrawide IPS
Case Phanteks Enthoo Pro M Windowed - Gunmetal
Audio Device(s) Xifi Elite Pro 7.1/VideoLogic ZXR550's
Power Supply XFX Pro Black Edition 750W Gold modular
Keyboard CM Storm Octane Combo
Software Win 10 Home x64
#5
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:
 
Joined
Mar 2, 2006
Messages
5,289 (1.22/day)
Likes
19
Processor AMD Athlon 64 3200+
Motherboard DFI LanParty nf4 Ultra-D
Cooling Thermaltake Big Typhoon
Memory 2x512MB GeIL
Video Card(s) ATI Radeon X800XL
Storage 2x80GB Western Digital
Display(s) HP vs17
Case SuperTalent
Audio Device(s) Soundblaster
Power Supply Ultra X-Finity 500 Watt
#6
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.