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Cchanged RAM, now CPU won't overclock

post #1 of 6
Thread Starter 
Hello,
I changed my RAM today from Kingston 512 DDR PC3200 ram to two sticks of Infineon 512 PC3200. I have a 2.4A CPU and was able to overclock up to 3Ghz with the Kingston. With the Infineon, it seems to only want to run at 2.4. I have tried a 5:4 divider, CAS down to 3, and upped the voltage to 2.65 on the DRAM. My motherboard is an IS7. Is it possible I just have gotten ahold of 2 bad sticks (no overclocking potential)? If so, is it better to run only 512megs of RAM at 2.4Ghz or 1gig of RAM at 2.4Ghz?

Thanks for any help,

Erik
post #2 of 6
My first guess would be that your new RAM requires more voltage than your previous RAM. Try bumping the vdimm up a bit higher, maybe 2.75 volts. Most DDR can take in the range of 2.8-2.9 volts without having problems, and certain types of RAM require considerably more voltage to perform well (3.5 volts or more for some). Do you have any idea what ICs (integrated circuits) are used on your new RAM?

Please take a few minutes to fill in your system specs by going to the User CP linked in the upper left corner of every page. That will help us help you better.

Last but not least, welcome to the forums.
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post #3 of 6
Thread Starter 
Hello,

Thanks for the quick reply. I will get those specs added shortly.

I swapped both chips into opposite slots so they would not run in DDR mode, and now it boots up at 3Ghz. Would the voltage increase apply to why it would not work in DDR mode but would in non DDR mode?

Thanks again,

Erik
post #4 of 6
I'm not quite following the part about DDR vs. non-DDR. Are you perhaps refering to dual channel vs. single channel? If that's the case, it's possible that the two DIMMs are not sufficiently similar to run in dual channel mode, though that's fairly unlikely if they were sold as a matched pair. Checking out your motherboard's manual, it states that you can use either slots 1 and 3 or slots 2 and 4 when using two DIMMs, and either combination should work with both single channel and dual channel RAM. Try running Memtest86. That program is a fairly intensive RAM tester that should identify if you perhaps received a dud or if there is some instability due to your current settings.
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post #5 of 6
Thread Starter 
Hello,
I will run the test as you suggested.

Basically what happens is if I put the memory in slots 1 and 2, it boots up fine. But if I use slots 1 and 3, which enables the dual channel, it won't even post.

Thanks again,
Erik
post #6 of 6
Try differant combonations, like slot 2 & 3, I wouldn't worry to much about dual channel if your going for a high overclock which will offset the differance.
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