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What voltage should I use for my RAM?

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  • Memory
  • RAM
Last response: in Memory
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November 21, 2003 8:40:41 AM

First I have to say, that I am from austria (Europe) and so my English maybe isnt perfect.



I have 2 Infineon 512MB PC3200 (DDR400) Cl 3 modules (model number: 35 1481 W18875). My problem is, that they run at very bad timings over 180MHz (i.E. 3-3-3-8 at 200Mhz). I dont have any heatspreaders, but I would buy them, if it would make any difference.

I have set the voltage (Vdimm) to Auto in my BIOS, which is 2.77V on my Mainboard. My question: what voltage can I use for a longer time w/o risking to damage my RAM (I want my RAM to last for at least 3 years)? The settings I have in the BIOS: 2.5V, 2.63V, 2.77V, 2.9V. If you think, that I could even use a higher voltage than 2.9 w/o risking to damage my memory I could maybe make a volt-mod.

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More about : voltage ram

November 21, 2003 6:15:50 PM

i'd say at 2.77 you may be pushing it. Heres what you do, after playing a few games for an hour or so, ground yourself, open you comp. case and carfully touch the ram chips on the memory module if they are hot to the touch then you should stay where you are or preferably back off. To give you a general idea you don't want your memory over 45c. If your memory seems to be running pretty cool try 2.9v and make sure your ram is not overheating.


If it isn't a P6 then it isn't a procesor
110% BX fanboy
November 21, 2003 6:20:55 PM

Ok, I will do that the next time after runnining prime95, which is the app which puts most stress on the most memory (except memory testing programs).

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November 22, 2003 8:37:48 PM

I have just found out, that the model number on the module isnt listed from Infineon, but the model number of my chips (HYB25D256800BT-5) is listed. I have found out, that they normally recommend 2.5-2.7V (is 2.77 too much?), but they have a absolute maximum rating of -0.5 to 3.6V, and in the Datasheet it says this about the absolute maximum rating:

Quote:
Note: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only, and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.

Do you think, that the absolute max. rating (3.6V) is dangerous for my RAM?


Here is the link to the datasheet: <A HREF="http://"http://www.infineon.com/cgi/ecrm.dll/ecrm/scripts/publi..."" target="_new">http://www.infineon.com/cgi/ecrm.dll/ecrm/scripts/publi...;/A> (<b>Edited because old link doesnt work anymore</b>)

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20x10x32 Burner<P ID="edit"><FONT SIZE=-1><EM>Edited by MrBurns on 11/23/03 02:34 AM.</EM></FONT></P>
November 22, 2003 10:57:54 PM

i'll just say that heat can take its toll...you can run 2.77 - 2.8v if you wish, i am sure it will run for a while, however i guarantee you that those sticks of ram will not last anywhere near as long as at 2.7v. Its like saying a cars peak RPM is 6500, if you run the engine at 6000rpm continously you will definitly have premature failure.

I'm not saying dont do it...just expect that your ram may not last as long as you would like...


If it isn't a P6 then it isn't a procesor
110% BX fanboy
November 29, 2003 7:15:56 AM

But I dont have enough budget left, I am only a poor student.

I will run my CPU w/ 179x13 (2327MHz) instead of 203x11.5 (2335MHz), because I still have more 3DMarks in 01SE, because the best timings I can get w/ 179MHz are 2-2-2-7 (Tras 7 is faster than Tras 5 or 6 on my PC), w/ 203Mhz the best I can get is 2.5-3-3-8. These timings are not tested w/ prime95 yet, the lowest timings I tested w/ P95 are 2.5-2-2-6@179MHz (Tras 7 is faster) and 3-3-3-8@203MHz.

I know know, that I should have got Kingston ValueRAM for 10$ per module more instead (w/ the same officail supported timings), I also found out, that allo Kingston modules have lifetime warranty (Infineon has only 2 years).

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20x10x32 Burner<P ID="edit"><FONT SIZE=-1><EM>Edited by MrBurns on 11/29/03 04:18 AM.</EM></FONT></P>
November 30, 2003 5:10:10 PM

The modules are rated as PC3200, but I suspect, that they are identical w/ the PC2100 modules from Infineon.

If I would have taken Kingston Value, I would at least have a lifetime warrantee.

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December 4, 2003 6:47:54 AM

I now use 2.77V for my RAM, because of the replies in all the 17 forums where I posted this: 32 people gave replies, which answered the question: 16 (50%) daid, that I should use 2.9V or more, 13 (40.6%) said I should use 2.77V and 3 (9.4%) said I should use 2.63V. I will test, if 2.63V is also stable at the best setting I can get w/ 2.77V.

About heatspreaders: After hours of prime95 I touched the DIMMs. I tried this w/ long and short FFT lenghts, but they were max. lukewarm, althought they get a lot warm air from the CPU-cooler. When In used short FFT lenghts I touched all chips, because short FFTs only stress a small memory area. Because i.e. the chips on my GPU get very hot I dont think, that I need any heatspreaders for my main memory. Also strange is that my memory gets hotter at 179MHz than at 203MHz, just because I have lower timings at 179MHz (<A HREF="http://forumz.tomshardware.com/hardware/modules.php?nam..." target="_new">see here for details</A>). I didnt note any difference between 2.63V abnd 2.77V in heat (but 2.63V isnt tested for stability yet).

Another strange thing is that I get better 3DMarks at 179x13 = 2327MHz than at 203x11.5 = 2335MHz, just because the timings are a little better at 179MHz. Also my memory gets a little warmer w/ 179MHz and the lower timings than w/ 203MHz and the higher timings.

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16x48 DVD-ROM
20x10x32 Burner<P ID="edit"><FONT SIZE=-1><EM>Edited by MrBurns on 12/04/03 03:51 AM.</EM></FONT></P>
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