Ram upgrade makes OC unstable

1dmf

1dmf

1dmf

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Joined
30 Nov 2006
Posts
468
Hello,

I've been happily running my new rig E6700 2.67ghz @ 3.50ghz and Cellshock 2GB 1000mhz @ 1050mhz on XP Pro fine!

I then upgraded to Vista Ultimate 64bit , working like a dream, fine!

Then as I had always promised myself if I ever got Vista, I would get 4gb of ram , So I merrily purchased another 2gb matched pairs of Cellshock.

However Vista would not boot normally, only in safe mode.

I tried XP Pro (as i'm still dual booting) and it worked fine for @ 10 minutes then the PC froze.

I had a go at the new Vista boot recover , it did find a corupt registry but that failed to repair!

So I figured OK I have always been OC'ng this rig, lets start again!

I put it back to default / factory settings and Bingo , Vista booted fine.

So I kept changing the settings and re-booting and each time was fine, so I thought OK a glitch maybe, i did remove the memory and re-seat as well as swap channels so the new pair were in the first dual channel slots.

Re-booted and bang Vista crashes, so dropped the settings a tad in the bios and now Vista is back up and good to go.

OK my new OC is only 3.37ghz & 1032mhz memory.

So the question is, why did adding another 2gb of exactly the same high quality matched pair memory modules cause the OC to go unstable?

Shouldn't I be getting a bit more than this out of the memory? OK they are only badged to run @ 1000mhz , but they are Cellshock 4-4-4-12 PC8000 dual channel dims!

any ideas? i did try a little more juice but that didn't help and I didn't want to max it to +2.4v, I also tried 5-5-5-15 !

is it going to have to be a side effect of running 4gb? does the slowdown in OC get out weighed by the benefits of having 4GB Ram?

All input appreciated.

Regards,
1DMF
 
Yeh its usualy diffrent on 4gb of ram you will probs be better going back to default clock untill your in vista and got it running and try overclocking ang seeing what you get stable.
 
It's much harder to get a decent overclock with 4 sticks because no matter how much you might like to think the RAM is all the same, it's not. Plus you have additional timing issues with 4 slots vs. 2 slots and you also tend to see a voltage drop (that you have tried to correct).

It seems that your 2 newer sticks won't overclock as much as your older ones, not a big drop though, I wouldn't say.
 
Thanks for the input.

I guess 3.33ghz is still ok on the CPU , shame i'm only getting stock out of the RAM, but they are 1000mhz anyhow so it aint that bad really :D
 
Why not run a less agressive multiplier and go for processor MHz rather than try and get the RAM max'd out?
 
I would if I could, but I can't get high enough bus speeds.

I've tried 375 x 6 and it just won't boot, 356 is the highest I can get the bus.

i originaly wanted 400 x 9 with ram @ 800 giving 1:1 ratio and 3-3-3-8 timings.

but my board just won't do the higher bus speeds, so got rid of my 800mhz memory and got the Cellshock, thought if I cant get the bus higher I'd getter faster memory.

oh well , can't have it all I guess :(
 
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