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Bad DIMM slot?

post #1 of 6
Thread Starter 
I've done some searching around OCN and the web and can't seem to find anyone with a similar problem. The first pair of DIMM slots on my sig rig work fine up to 800 MHz, but they seem to start getting errors past 800 MHz. I originally thought the problem might be the RAM, but I've tried it with 2 different sticks, some Patriot 800 MHz and OCZ 1066 MHz. I've tested with individual sticks and dual channel configuration, and I always seem to get errors on the slots in question whereas the other slots get significantly less or no errors (depending on speed, timings, etc.)

Is it possible to have half bad RAM slots? confused.gif
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post #2 of 6
Are you using the first 2 (closest to the CPU) same colored slots? If so those are the right slots, but if your having problems with those 2 you can always use the 2nd two same colored slots. In 4 stick applications any 2 same colored slots will work. 6 stick triple channel applications has to be used in the correct 3 slots only. (unless of course your using all 6 slots)

BTW, those sticks have EPP Extreme Performance Profiles that changes your settings for you so you can use those sticks at 1066 5-5-5-15. But only 2 sticks, the profile doesn't work with 4 sticks. First you have to go into BIOS and change all your RAM settings to AUTO, including voltage as it increases volts too. Then enable EPP in BIOS and restart. That was the ONLY way I got those sticks to run at 1066 in my AMD rig. I tried for months with no luck before just changing that one setting. You can even try using them in the first 2 slots with the EPP settings. If it still gives you errors switch them to the second 2 slots.
Edited by letsgetiton - 1/30/11 at 4:00pm
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post #3 of 6
Thread Starter 
It's a DDR2 dual-channel board, so it only has 4 slots. And, yes, when I'm testing dual channel config, I'm using the same color slots. Dual channel confirmed on POST message as well.

Skimming P5Q pro owner's thread right now for anything. I supposed a good start would be updating my BIOS as I'm still running the original BIOS it shipped with and there have been a number of updates.
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post #4 of 6
Thread Starter 
Looks like you have the reapers, correct? This is the OCZ set I have. The Patriot and OCZ sticks have EPP, but as checked with CPUID, all of my settings were manually set to match the EPP for stock speeds.
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post #5 of 6
Yes I have those on my AMD rig.
By stock settings do you mean 1066 5-5-5-15 2.0-2.1v on the OCZ? That's what we're looking for. That's the EPP setting that otherwise eludes some of us AMD owners. I don't know about your intel 8500 but with AMD it's hard to get to 1066 stably. (that's just a 800 OC) With the EPP enabled it was a cinch.
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post #6 of 6
Thread Starter 
Yes those are the settings I used, and I even tried overvolting a little bit (2.2V) as it is still covered by warranty. No luck. Also, I'm almost 100% certain that at least some of this instability is something with my motherboard, seeings as 2 sets of sticks from different manufacturers w/ different speeds are having problems running at stock speeds or barely above (OCZ/Patriot respectively) in only 2 slots. I was more just wondering if anybody has ever heard of DIMM slots failing only above certain frequencies.

At any rate, my OCZ memory is in the process of being RMA'd and I'll be sure to update if I find that new memory eliminates this problem.
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