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RAM Voltage

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January 20, 2009 11:18:56 AM

Hi, my RAM is 2.1v per stick of 2Gigabytes, of which I have two sticks, which comes to 4 all together. The default output of the motherboard is 1.8v to the RAM. Here's the problem; if I put one stick of RAM in to the motherboard it works, but with two sticks of RAM it doesn't.

The setting I'm looking at for the RAM voltage in the motherboard is DRAM which is set to 1.8v. Is it the right setting I'm looking at.

Gigabyte recommend a BIOS upgrade. But if it fails I'm ****ed. So I thought about looking in to RAM voltages first.

Please help.

More about : ram voltage

January 20, 2009 6:56:53 PM

what board you have?

yes its right setting
January 20, 2009 9:06:23 PM

Gigabyte GA-EP45-DS3L

The same motherboard they used on the 625 dollar marathon system in December, but I'm using Vista 64. I have tried the volatages at 2.1v (like it says on the RAM) but the computer just keeps resetting. Also changed the timing to the same as it says on the RAM, still doesn't work, just keeps resetting again.

I think the bios is an old version so I'm going to update it with Q-Flash, but I heard it's risky to update firmware. My Bios doesn't come with memory hole or memory remapping options in the Bios. I have tried that kb97777 update but it wasn't for my system.

If you know of anything I can try it would be appreciated. Thanks for listening.
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January 21, 2009 7:37:22 AM

I can't imagine that the BIOS needs a flash.

Did you try each stick by itself or just with and without the second stick? If the case is the latter it is possible that you have a bad stick. Try the second stick by itself. You will probably need 2.1V to get them stable, then you can try to lower them a small amount at a time.

Always include the pertinent data when asking a question. Like... maybe... what RAM?

You can also test each stick by itself with Memtest86+.


January 21, 2009 7:48:58 AM

Ram: Patriot 4GB PC2-6400 C4 Viper Extreme Performance (2x2GB)
Board: GIGABYTE GA-EP45-DS3L

I have tested both sticks of RAM and it works with each in every slot.

The Bios upgrades says the updates fix memory problems.

I'll have to try memtest86+
January 21, 2009 9:40:08 AM

If a BIOS update says it fixes memory problems then do the flash. Just make sure you use Q-Flash and not the @BIOS and you should be fine.
January 21, 2009 10:36:16 AM

Thanks for the help Zorg. I'm going to do the flashes.
a b } Memory
a b V Motherboard
January 21, 2009 11:37:04 AM

My memory is 4x1 gig sticks Patriot Extreme DDR, supposed to run at 2.1 volts. Will run at this with only 2 sticks, but I have to volt to 2.25 get all four sticks to boot and run stable.
January 21, 2009 12:01:37 PM

I'm currently only running 1.8v. I have tried 2.1v but it didn't work.
January 21, 2009 1:31:25 PM

jitpublisher said:
My memory is 4x1 gig sticks Patriot Extreme DDR, supposed to run at 2.1 volts. Will run at this with only 2 sticks, but I have to volt to 2.25 get all four sticks to boot and run stable.
He's only running two sticks. I have no idea why it won't run at 2.1V.

seogoat, If you are still having trouble after the flash, try loosening the timings or lowering the speed. Look under the SPD tab in CPU-Z to get the recommended timing choices.
January 21, 2009 1:42:47 PM

Lowering the speed of what, the RAM ? I will try after the flash. Many thanks again.
January 21, 2009 7:16:11 PM

try to loose the timings to 5-5-5-15 and run them on 1.8 volts but i saw specifications of this RAM and 4-4-4-12 needs 2.2 volts not 2.1 as mentioned...

maybe bro you just ran in to bad luck with this sticks
January 22, 2009 12:26:32 AM

seogoat said:
Lowering the speed of what, the RAM ? I will try after the flash. Many thanks again.
Yeah, assuming the flash doesn't solve your problem. Look at the CPU-Z SPD tab, as I said earlier. Either try relaxed timings at 1.8V or the RAM may have a SPD for 667 with tighter timings at a lower voltage, instead of the stock 800. The difference in performance won't be dramatic, depending on how much cache your CPU has. Generally speaking the Core2 is not that sensitive to speed.

I recommend, to people that haven't already bought RAM, 2 x 2GB DDR2 800 5-5-5-15 (to 18) or better at 1.8V. These days with all the RAM that runs at 800 and 1.8V it doesn't make sense to run the 2.1-2.2V sticks, unless you need the EPP SPD of 1066 for OCing purposes.
January 22, 2009 5:52:38 AM

On the RAM they say 4 -4 -4 -12, and I think the default of my pc is 5 - 5 - 5 - 15, but after the flashes, if it still doesn't work I'll try something like you said i.e. 5 - 5- 5 - 18.

Many thanks Zorg.
January 22, 2009 7:38:42 AM

I don't think going from 5-5-5-15 to 5-5-5-18 will solve your problem. What do the memory and SPD tabs say in CPU-Z?
January 22, 2009 8:37:43 PM

January 22, 2009 8:48:54 PM

there are four boxes in the spd tab on cpu z. for the 1 stick of ram i have these settings.


JEDEC #1 JEDEC #2 JEDEC #3 EPP #1
frequency 200 Mhz 266Mhz 400 Mhz 400Mhz
cas#latency 3.0 4.0 5.0 4.0
ras# to cas# 3 4 5 4
rax# Precharge 3 4 5 4
tras 6 8 12 12
trc 12 16 23 21
command rate 2T
voltage 1.8v 1.8v 1.8v 2.1v


This is only 1 stick. So I'm guessing I should run it at

5 - 5- 5 -12
January 22, 2009 8:53:05 PM

there are four boxes in the spd tab on cpu z. for the 1 stick of ram i have these settings.


-----------------------JEDEC #1 JEDEC #2 JEDEC #3 EPP #1
frequency---------- 200 Mhz 266Mhz 400 Mhz 400Mhz
cas#latency --------3.0 ------4.0 ------5.0 ------4.0
ras# to cas# -------3 --------4 ---------5 --------4
rax# Precharge ----3 --------4--------- 5- -------4
tras -------------------6 --------8 --------12 -------12
trc --------------------12 -------16 -------23 -------21
command rate --------------------------------------2T
voltage --------------1.8v -----1.8v ----1.8v -----2.1v


This is only 1 stick. So I'm guessing I should run it at

5 - 5- 5 -12
January 22, 2009 9:35:12 PM

but the two still dont run.

Can anyone recommend some different ram that gigabyte boards like.

Haven't done the bios update yet.
January 23, 2009 7:17:34 AM

The ram says 800mhz on it. Do these stats mean it's only running at 400mhz? If that's the case then I need new RAM right?
January 23, 2009 5:23:12 PM

seogoat said:
The ram says 800mhz on it. Do these stats mean it's only running at 400mhz? If that's the case then I need new RAM right?

its ddr so 400mhz means ddr 800.
January 23, 2009 11:31:00 PM

BIOS updated still no luck with the RAM damn it !

With the command rate I only get the option to enter 1 or 2 without T. So I can't enter 2T, just 2. Is it okay to just change it to 2.

Volted the RAM up to 2.1v comp just keeps resetting so I take it it doesnt like it.
January 24, 2009 4:23:48 PM

ran memtest on first two partriot sticks; they were both fine. However it still wouldn't run dual channel mode. Memtest wouldn't run on dual channel.

So bought some 1.8v ram 5-5-5-15. Runs fine with one stick on memest but memtest wont run on two sticks.

Does this sound like a motherboard problem?
January 24, 2009 4:39:06 PM

Sorry, I have been busy.

Did you set "display logo", or something similar, to [Disabled]? You should see at the start of POST that it says "Memory Runs in Dual Channel Interleaved", or something similar.

You say the 2 x 2GB Patriot passed Memtest?

If so then use it.

If you are not in dual channel, check the slot location of the RAM.

I believe that you should be in slots 1 & 3 or 2 & 4.
January 24, 2009 4:43:36 PM

they ran okay 1 at a time but not with both - and it was the same with some new memory i bought
January 24, 2009 4:44:08 PM

no matter when memtest wont run with dual channel, it just freezes
January 24, 2009 4:45:01 PM

i have tried it in all 1 & 3 - 3 & 4 - dual channel wont work
January 24, 2009 5:41:48 PM

Got it, it's not that it's not running in dual channel, it's that it won't run at all in dual channel.

Did you try setting memory Performance Enhance to [Normal]? I think that only OCs a little under load so it probably isn't the problem, but it's worth a shot.

You can try to email Gigabyte although I don't know what response you will get. It should work unless both sets of RAM are incompatible.

What's the new set that you bought?
January 24, 2009 5:55:37 PM

New Ram is PNY Technologies 1.8v 2x2gb pc6400 800mhz

thats running at 5-5-5-15 -1.8v

Its a bit of a bugger really. I did read somewhere that the auto settings in the bios are no good. I think it's either that or a faulty board.

Thanks for you help anyway.
January 24, 2009 5:56:36 PM

does the front side bus of the processor need to run at 400mhz? I think it's currently at 266Mhz?
January 24, 2009 6:00:55 PM

No, as a matter of fact if you are trying to sort out the RAM you want the settings for the CPU/FSB at stock. Did you try running the RAM at 266?

Although it should run at 333 or even 400 with no problems, it would be good to know if it will even run at 266. That speed would match the 1066 of the FSB 1:1.

I imagine you know this already, but it is done by setting the memory multiplier to 2.
January 24, 2009 6:06:20 PM

FSB is running at 266Mhz so are you saying I should run the ram at that speed to test.

I don't know this already, this is the first pc I have built.
January 24, 2009 6:17:48 PM

If you didn't know that how did you run the RAM at 667?

Anyway, there is a setting for the speed of the RAM.

Set System Memory Multiplier (SPD) [Manual]
Set Performance Enhance [Standard]
Set System Memory Multiplier (SPD) [2] which will give you a speed of 532 ~533 (2 x 266).

You can also find the setting that corresponds to 667 and try that.
January 24, 2009 8:18:52 PM

thanks
January 24, 2009 8:52:39 PM

Absolutely spot on mate! :) 

It works! hahaha

I thought it never would..

You've been a great help. I think I'm going to hang in these forums and learn some more!

Thanks
January 25, 2009 12:21:30 AM

Congratulations! :bounce: 

That is what I was talking about early on with regard to lowering the RAM speed.

So the Patriot RAM is running at 266 (533 effective) 4-4-4-8? 8 may be a little tight even though it's in the SPD. If that doesn't work try 4-4-4-12

If so, you may be able to get it to run at 667 4-4-4-12 or 5-5-5-15, even though there is no specific entry in the SPD table.

The setting would be System Memory Multiplier (SPD) [2.5] 266 x 2.5 = 665 which is ~ 667.

If you can get 667 stable, then you can OC your chip (whatever it is), assuming you have good cooling.

You would set the FSB to 333 and the RAM back to [2]. that would give you about a 25% OC and RAM at 667 1:1.

Since you are new to this, I suggest you at least read and understand a couple of stickies before starting in on the OCing.

Core 2 Quad and Duo Temperature Guide
HOWTO: Overclock C2Q (Quads) and C2D (Duals) - Guide v1.6.1

Good luck with your new build and enjoy.
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