P5B + E6600 Overclocking help :)

[imported_Buckster]

Nice to join this forum, I'm very pleased with my new Conroe system I've built (P5B, W24 E6600, 2 gig Corsair TwinX C5, X1900XT) - but I'm wondering if I can overclock that bit more

I'm current at 9x330 fsb, CAS4 RAM, and a nice low Vcore - 1.35V - Orthos stable, 1:1 CPU:Memory.

If I go above 333 - Orthos won't pass more than 2 mins on either Large FFTs, OR Blend, in fact sometimes it won't even last more than 10 seconds, but it will run with no probs with Small FFTs ..

I've tried everything, RAM Voltage up to 2.0V, RAM to CAS5, MCH/Northbridge voltage up, FSB voltage up, CPU voltage up to 1.45V.

None of these help, in fact if anything Orthos fails quicker .. Have I just reached the limit of my CPU ? 3.0 gig currently is fast enough - and I'm very happy- just wondering if I can go further

Temps aren't a problem, apart from Mobo which is a bit toasty @ 40-43C, CPU idles at 36C and under full Orthos Prime gets to 50C read by Coretemp.

Thanks for any help, Mark.

 

[Baked]

Go straight to 8x400. Oh, you got a week 24 E6600.

 

[imported_Buckster]

Thanks - yes W24s aren't the best

I'm a bit concerned as a friend with exact same system, tried 7x400 and system would hardly boot, at 8x400 - it wouldn't go out of the bios screen !

Mark.

 

[imported_Buckster]

doesn't the CPU running small FFTs fine mean its probably not a limitation of the CPU though ?

 

[Conky]

Originally posted by: Buckster
doesn't the CPU running small FFTs fine mean its probably not a limitation of the CPU though ?

Could be a RAM limitation.

 

[Baked]

Have you tried flashing to the newest BIOS for your P5B? In a lot of cases, flashing to the latest BIOS solves the problem.

 

[imported_Buckster]

Thats what I thought Beachboy, but the RAM is rated at 800MHz at CAS5, at 1.9V .. I have run E6600 at stock stable, with RAM at 800MHz CAS5 as per RAM specs.

I'm running 1:1 - so even at 340fsb - thats only 680MHz at CAS4 vs rated of 666 at CAS4, I tried CAS5 too (5-5-5-12, and 5-5-5-15), which is under its specs, and that didn't work either

Mark.

 

[imported_Buckster]

Baked - not yet - I'm a bit loathe to try the betas, but as soon as official one is out, it'll be flashed

 

[cmdrdredd]

flash to the beta...trust me. it fixed EVERYTHING I had an issue with. Memory timings above 266Mhz FSB with some memory brands are flaky with the 507. Use the 609 or 614 beta. There have been many many reports on this across all the other forums (i.e. not for noobs). I have the same memory and setup and run 400x7 at 1:1 memory at 5-5-5-12 with no problems. I can even do 400x8 but it's a little hot until i get my new cooler (upgrading from CNPS950 to Ultra-120w/Panaflow M1BX). I also have a week24 6400 btw and there's absolutely nothing wrong with it. Just takes some extra voltage over the newer ones to keep stable, and that means you need good cooling.