Overclock.net › Forums › Components › Memory › Ram voltage question...
New Posts  All Forums:Forum Nav:

Ram voltage question...

post #1 of 6
Thread Starter 
Well, I experienced something yesterday that I'm not quite sure what to make of.

For Christmas, a buddy of mine gave me a set of Kingston HyperX 1066 DDR2 memory (yeah, yeah, old I know, but i still run ddr2). The memory is listed at 5-5-5-15-2 @ 2.3V. I've always set it at that, since I figured that's what it needed to run right.

Well, in my overclocking adventures with my 960t, i must have reset the CMOS, and forgot to change the ram voltage (1.95V, stock), and was prime blending and let it run overnight, and it passed perfectly fine.

I didn't notice until today that it was running at only 1.95v, albeit, the ram timings were slightly higher, 5-5-5-18-23-2. Though, I don't think that should equate into needed .5V to run them.

Another issue I was having was trying to find the max HTT for my system. If i dropped the ram multiplier to 4x (800), and then increased HTT to 240 or higher, the ram would consistently have problems. Just for the fun of it, I tried it with this lower voltage and it's working (currently testing 258.

So, my question is this: does too much voltage have a negative effect on the ram? Nothing else has changed, not northbridge/ht link or ram timings, but it is in fact, running significantly better at higher speeds.

The system, does however, seem to die out when I set the HTT to 266, which is what's needed to run it @ 1066, but I think that's more the motherboard than the ram itself.

Any thoughts on this? I just find it weird that they'd advertise it for 2.3V, and then not need anywhere near it to run; sure, even AMD overvolts their processors and all slightly to be on the safe side, but it just seems a bit excessive.
Primary
(11 items)
 
  
Reply
Primary
(11 items)
 
  
Reply
post #2 of 6
The rule of thumb with voltage is, the lower the better. Always shoot for the lowest voltage possible. If you can run your ram at 1.95 instead of 2.3v, that's excellent. You'll prolong the life of the ram, produce less heat, and draw less power.

As far as your HTT clock goes. When you say you drop the ram multiplier, I think your referring to the HT multiplier, right? Your ram should be something like 200 / 266 / 333 / 533 divider. If you set the base clock to 200 and use the 533 divider, your ram will run @ 1066mhz. If your using a 266 base clock with a 533 ram divider, your ram will be running at 1198Mhz, and that would defiantly cause your ram to error out if it didn't have enough voltage.

Can you post a CPU-Z shot of the CPU and Ram speeds?
post #3 of 6
Thread Starter 
375

Screenshot, as requested.

Basically, what was happening was: if I changed the RAM multiplier from 5.33x to 4.00x (dropping speed from 1066 to 800), and then increased the HTT from 200 to 250 (yielding 1000mhz ram), the ram would error out in prime, linx and memtest.

After lowering the voltage, nothing else changed, as you can see from the screenshot the HTL & NB are running close to stock, it runs prime, linx and memtest without any errors. The prime session was overnight + during my work time, so about 22 hours.

Unless AMD overdrive is the culprit, but I've used it before with no issue what-so-ever. I'm just kinda at a loss. I guess a case could be made that the ram was overheating, and yeah, it was pretty hot to the touch. Considering adding a fan there blowing across the memory.
Edited by ozzy983 - 2/10/12 at 1:19am
Primary
(11 items)
 
  
Reply
Primary
(11 items)
 
  
Reply
post #4 of 6
Hmm. That is strange. Heat could be an issue, but if your using the same voltage with 5.33x and 4.00x it shouldn't make a difference. Have you tried bumping chip set voltage a little and re-testing?
post #5 of 6
Thread Starter 
Quote:
Originally Posted by *ka24e* View Post

Hmm. That is strange. Heat could be an issue, but if your using the same voltage with 5.33x and 4.00x it shouldn't make a difference. Have you tried bumping chip set voltage a little and re-testing?

It gets weirder, but I'm used to it, since this board seems to have some very strange issues when you overclock 'em too high.

But, I think I figured it out, and that makes it even weirder.

Basically, if I set the voltage to 1.9, it works fine with the multiplier set for 5.33 (1066). If I increase the FSB to 267, drop the multiplier to 4x (1064), and increase the voltage to 2.1V, it will now work fine.

I can verify it, so that seems likely the "issue", though, I'd call it more a quirk.

I'm just mainly doing some testing on higher HTT as opposed to just overclocking via the multiplier; seems the benchmarks prefer a higher HTT, and the system does seem more responsive that way; placebo effect perhaps.

One last thing I did notice too was that when I have the memory clock set to AUTO (4x multi), it changes the default Row Refresh Cycle Time from 127ns (seems the default for my ram/spd) and sets to it 127ns for DIMM 3 & 75ns for DIMM 4; both are populated dimms, the other 2 are set for 75ns, but are empty. If I select MANUAL and 4x, it sets both D3 & D4 for 127ns.

I don't know if that has any effect on it or not.
Primary
(11 items)
 
  
Reply
Primary
(11 items)
 
  
Reply
post #6 of 6
Have you installed the latest bios for your motherboard?
Amelia
(13 items)
 
Professional
(13 items)
 
RCPC#1
(17 items)
 
CPUMotherboardGraphicsRAM
Phenom II X6 1100t MSI 890FX GD65 MSI Radeon HD5670 GSkill RipjawsX DDR3 PC3 12800 2x4GB CL8 
Hard DriveOptical DriveCoolingOS
WD Black 1TB SATA III Samsung BD Zalman 9900MAX Windows 7 64 Professional 
MonitorKeyboardPowerCase
AOC 22" LED Logitech Kingwin Lazer Platinum 500w Fractal Design R3 
Other
Samsung 470 SSD 128GB 
CPUMotherboardGraphicsRAM
AMD Phenom II X6 960T Asus M4A88T-VEVO Asus Strix R7 370 SuperTalent Perfomance 
RAMHard DriveHard DriveOptical Drive
GSkill Snipers Monster Daytona Seagate Barracuda 500GB 7,200 RPM 16Mb cache Memorex DVD/RW 
CoolingOSMonitorKeyboard
Corsair H60 Windows 8N IBM 9494 19" LCD IBM 
PowerCaseMouseMouse Pad
Corsair GS500 In Win H-Frame Wolfking OCZ Behemoth 
Audio
JBL Creature 
  hide details  
Reply
Amelia
(13 items)
 
Professional
(13 items)
 
RCPC#1
(17 items)
 
CPUMotherboardGraphicsRAM
Phenom II X6 1100t MSI 890FX GD65 MSI Radeon HD5670 GSkill RipjawsX DDR3 PC3 12800 2x4GB CL8 
Hard DriveOptical DriveCoolingOS
WD Black 1TB SATA III Samsung BD Zalman 9900MAX Windows 7 64 Professional 
MonitorKeyboardPowerCase
AOC 22" LED Logitech Kingwin Lazer Platinum 500w Fractal Design R3 
Other
Samsung 470 SSD 128GB 
CPUMotherboardGraphicsRAM
AMD Phenom II X6 960T Asus M4A88T-VEVO Asus Strix R7 370 SuperTalent Perfomance 
RAMHard DriveHard DriveOptical Drive
GSkill Snipers Monster Daytona Seagate Barracuda 500GB 7,200 RPM 16Mb cache Memorex DVD/RW 
CoolingOSMonitorKeyboard
Corsair H60 Windows 8N IBM 9494 19" LCD IBM 
PowerCaseMouseMouse Pad
Corsair GS500 In Win H-Frame Wolfking OCZ Behemoth 
Audio
JBL Creature 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Memory
Overclock.net › Forums › Components › Memory › Ram voltage question...