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Max Safe Voltage for DDR RAM

post #1 of 16
Thread Starter 
I was trying to increase my memory overclock but I ran into errors at 230mhz on 2.75V while running memtest. So my questions are :

1. What's the maximum safe voltage for my Kingston Value RAM 512x2 Dual Channel (the ram has no heatsink on it).

2. How do I know if a particular amount of voltage is safe/unsafe as there are no temperature sensors specifically for RAM.

3. What would be the maximum overclock I could expect from my RAM.


The RAM is stable at :

3-3-3-8 2T at 225mhz at 2.65V
Mobo Load Temp - 35C
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post #2 of 16
I would say 2.8V for cheap ram, 2.9V at the very top if you can tell that the ram sticks don't heat much.

For the others I can't tell, I underclcok the ram for better timings.

Cheers!
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post #3 of 16
Quote:
Originally Posted by Walk_this_way View Post
I was trying to increase my memory overclock but I ran into errors at 230mhz on 2.75V while running memtest. So my questions are :

1. What's the maximum safe voltage for my Kingston Value RAM 512x2 Dual Channel (the ram has no heatsink on it).

2. How do I know if a particular amount of voltage is safe/unsafe as there are no temperature sensors specifically for RAM.

3. What would be the maximum overclock I could expect from my RAM.


The RAM is stable at :

3-3-3-8 2T at 225mhz at 2.65V
Mobo Load Temp - 35C
It's Kingston VALUE RAM, it's not built for overclocking, so keep that in mind.

There probably isn't a real "maximum voltage" because the manufacturer doesn't want you overclocking it in the first place!

What you should do is feel (yes, feel) the tops of the ram modules to see how hot they are. If they burn you (or could burn you easily) well that's a good indicator that you're near the limit. Just don't get electrocuted, I am in no way responsible for any damages to yourself or your system by listening to me.
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post #4 of 16
Thread Starter 
Bump , anyone have any experience with Kingston value ram before? Any other way besides checking heat to know if applying a certain voltage is safe or not? They're not even warm at 2.65V.

Also having another issue - at 220x10 with 1:1 divider I can get 220mhz easily. But when I try 265x10, and a 5/6 divider (166mhz) which is equivalent of 220mhz on the RAM, I can't even get it to POST.

Help please!
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post #5 of 16
As long as they're not hot you'll be good for some more voltage. BH-5 doesn't even have a limit that anyone can find, people have stuck it with 3.7v and it still worked great.

Some of the Kingston value RAM had good chips on it. Do me a favor and write down what chips they are if you please. It will let me know how far you could possibly go and maybe the voltage/timings. Thanks.

That's a Socket A rig isn't it? With Socket A, you never ever run a divider. You always keep it at 1:1.
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post #6 of 16
Thread Starter 
At 2.75v they were feeling warm whilst stress-testing so I brought it down to 2.7v.

They have Infineon chips. If you would like to know anyother details please ask.

This rig is actually a Socket 939 rig.
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post #7 of 16
I forgot to check the sig. (I feel so shtupid ATM). I'll check on the RAM for you. Do the chips have any numbers/letters on them?
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post #8 of 16
I'm guessing this is the value DDR400 RAM?

If you're using infineon chips (I'd like to know which ones) your max voltage will be around 3.0v, after that you won't see much, if any help from voltage increase. You'll be fine at 2.9v unless your sticks are ready to die anyways. You'll probably be looking at 225-235mhz max for a standard infineon DDR chip.
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post #9 of 16
Can you post a picture of the sticks for us or post the silk screening on the top of the actual ICs?
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post #10 of 16
Infineon, just like PROMOS doesn't scale well with voltage, so you're better off letting it stay at stock (2.6v) voltage and see what you can get out of that. I had some impressive timings on my PROMOS stuff and 184MHz.
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